FLOODS OF SEPTEMBER 26-OCTOBER 4, 1986, AND AUGUST 14 … · a southbound Chicago Transit Authority...

FLOODS OF SEPTEMBER 26-OCTOBER 4, 1986,

AND AUGUST 14-17, 1987, IN ILLINOIS

By G.O. Balding and A.L. Ishii

U.S. GEOLOGICAL SURVEY

Water-Resources Investigations Report 92-4149

Prepared in cooperation with the

ILLINOIS DEPARTMENT OF TRANSPORTATION,

DIVISION OF WATER RESOURCES

Urbana, Illinois

1993

U.S. DEPARTMENT OF THE INTERIOR

MANUEL LUJAN, Jr., Secretary

U.S. GEOLOGICAL SURVEY

DALLAS L PECK, c|irector

For additional information write to:

District Chief U.S. Geological Survey 102 E. Main St., 4th Floor Urbana, IL 61801

Copies of the report can be purchased from:

U.S. Geological Survey Books and Open-File Reports Section Federal Center, Box 25425 Denver, CO 80225

CONTENTS

Page

Abstract................................................................. 1Introduction............................................................. 1

Purpose and scope................................................... 2Acknowledgments..................................................... 2

Floods of September 26-October 4, 1986. .................................. 2Meteorological setting.............................................. 7Characteristics of rainfall distribution............................ 12Description and analysis of floods.................................. 17

Ohio River basin............................................... 17Upper Mississippi River basin above the Illinois River......... 17Illinois River basin........................................... 17Upper Mississippi River basin below the Illinois River......... 25

Floods of August 14-17, 1987 ............................................. 25Meteorological setting.............................................. 25Characteristics of rainfall distribution............................ 28Description and analysis of floods.................................. 31

Upper Mississippi River basin above the Illinois River......... 31Illinois River basin........................................... 31

Summary.................................................................. 41References............................................................... 42

ILLUSTRATIONS

Plate 1. Map showing total rainfall for the storms of October 2-4,1986, and August 13-14, 1987, in Illinois.............. in pocket

Figures1-6. Maps showing:

1. Location of rainfall-gaging stations in Illinois....... 32. Location and downstream-order number of streamflow-

gaging stations in Illinois from which data were used................................................. 4

3. Location and downstream-order number of streamflow-gaging stations in northeastern Illinois from whichdata were used....................................... 5

4. Counties designated as disaster areas as a result of the floods of September 26-October 4, 1986, and August 14-17, 1987................................... 6

5. Surface weather over the United States at 0800 hours central standard time on September 17, 18, 21, 24, 25, 30, and October 3, 1986 .......................... 8

6. Total rainfall for storms of 10-day antecedent period September 23-October 2 and 5-day antecedent period September 28-October 2, 1986 ......................... 13

7. Graphs of cumulative daily rainfall at selected rainfall- gaging stations in Illinois, September 17-October 5, 1986.: 15

111

ILLUSTRATIONS

Figure 8

10

11

12

14,

15

16

17

18

Graphs of cumulative hourly rainfall at selected rainfall- gaging stations in Illinois, October 2-4, 1986..........

Map showing recurrence intervals fpr the floods of late September and early October 1986 at selected streamflow- gaging stations in Illinois.............................

Map showing recurrence intervals for the floods of late September and early October 1986 at selected streamflow- gaging stations in northeastern Illinois................

Hydrographs of streamflow for selected streams in theIllinois River basin, September-October 1986............

Photograph showing vehicles on the Kennedy Expressway and a southbound Chicago Transit Authority train stranded at the Addison Street overpass between downtown Chicagoand Chicago O'Hare International

13. Maps showing surface weather over the United States at2100 hours 0600 hours

central standard time central standard time

Airport, August 14, 1987

on August 13 and at on August 14, 1987.

Graphs of cumulative daily and hourly rainfall at selected rainfall-gaging stations in Illinois, August 12-20, 1987.

Graphs of cumulative hourly rainfall at selected rainfall- gaging stations in Cook and Du Page Counties, Illinois, August 13-14, 1987.............. 1 ........................

Map showing recurrence intervals f<j>r the floods of August 14-17, 1987, at selected streamflow-gaging stations in northern Illinois............................

Map showing recurrence intervals for the floods of August 14-17, 1987, at selected £treamflow-gaging stations in northeastern Illinois........................

Hydrographs of streamflow for selected streams in theDes Plaines River basin, August 1987.....................

Page

16

18

19

20

26

27

29

32

33

34

36

TABLES

Table 1. Total rainfall and recurrence intervals at selectedNational Weather Service stations in Illinois duringthe storms of September 25-October 4, 1986................. 46

2. Summary of peak stages and discharges for the floods of late September and early October 1986 ; at selected streamflow- gaging stations in Illinois................................ 48

3. Data for selected streamflow-gaging stations for the floodsof late September and early October 1986................... 56

4. Total rainfall and recurrence intervals at selected National Weather Service stations in Illinois during the storms of August 13-14, 1987......................................... 85

IV

TABLES

Page

Table 5. Total rainfall collected at unofficial rainfall-gagingstations during the storms of August 13-14, 1987, for the period 0900 hours central standard time August 13 through 1200 hours central standard time August 14................

6. Summary of peak stages and discharges for the floods ofAugust 14-17, 1987, at selected streamflow-gaging stations in northern Illinois......................................

7. Data for selected streamflow-gaging stations for the floods of August 14-17, 1987.....................................

87

88

90

Multiply

inch (in.)foot (ft)mile (mi)acresquare mile (mi2 )cubic foot per second (ft3/s)

CONVERSION FACTORS

By

25.40.30481.6090.0040472.5900.02832

To obtain

millimetermeterkilometersquare kilometersquare kilometercubic meter per second

Temperature may be converted from degrees Fahrenheit (°F) to degrees Celsius (°C) as follows:

'C = 5/9 x (°F-32)

GLOSSARY

Antecedent rainfall.--Rainfall preceding the storm rainfall; the storm rainfall being the main cause of any flooding.

Anticyclone.--Center of high pressure around which winds blow clockwise in the Northern Hemisphere. <

Crest.--The highest value of the stage attained by a flood; thus, peak stage, flood crest, or crest. ;

Convection.--Atmospheric motions, usually in pie vertical direction, due to differential temperatures and (or) pressures.

Cubic foot per second Cft3 /s).--The rate of dis1 cubic foot of water passing a given point during 1 second.

Cyclone. --Center of low pressure around which winds blow counter-clockwise in the Northern Hemisphere.

Dewpoint.--The temperature to which the air must be cooled (at constant pressure and water vapor content) for saturation to occijr.

charge representing a volume of

Discharge.--The volume of water, in cubic feet point within a given period of time.

per second, that passes a given

Discharge hydrograph.--A graphical representation of stream discharge at a given point as a function of time.

Drainage area.--That area, measured in a horizontal plane, enclosed by a topographic divide from which direct surface runoff from precipitation normally drains by gravity into a stream above a specified point.

Drainage basin.--Area drained by a given stream and its tributaries.

Flood.--A relatively high flow, as measured either by gage height or discharge, which usually overtops the natural banks along some reaches of a stream.

Flood frequency analysis.--Defines the relation of flood-peak magnitude to probability of exceedance or recurrence interval. Probability of exceedance is the chance that a given flood magnitude will be exceeded in any one year. Recurrence interval is the reciprocal of probability of exceedance and is the average number of years between exceedances. For example, a flood having a probability of exceedance of 0.01 (1 percent) tias a recurrence interval of 100 years. Recurrence intervals imply no regularity of occurrence; a 100-year flood might be exceeded in consecutive years or it might not be exceeded in a 100-year period.

Flood peak. --The highest stage or discharge attained by a flood; thus, peak stage or peak discharge.

VI

Flood profile. --A graph of the highest water-surf ace elevations reached at points along a stream in flood, plotted as distance (as abscissa) against elevation (as ordinate).

Flood stage.--The approximate elevation of the stream when overbank flooding begins.

Front.--The transition zone between two distinct air masses.

Gage height.--The water-surface elevation referred to some arbitrary gage datum.

Jet stream. --High-velocity air currents usually found between 6 and 9 miles above the Earth's surface.

Peak discharge.--See flood peak.

Rainfall-gaging station.--A location where rainfall is measured in a systematic fashion.

Recurrence interval.--See flood-frequency analysis.

Stage.--See gage height.

Stage-discharge rating curve.--A graph showing the relation between the gage height (stage) and the volume of water per unit of time (discharge) flowing in a channel.

Streamflow-gaging station.--A particular site on a stream where systematic observations of gage height and discharge are obtained.

Surface weather.--Weather data collected at or close to ground level.

Water year.--The 12-month period, October 1 through September 30. The water year is designated by the calendar year in which it ends and which includes 9 of the 12 months.

VI1

FLOODS OF SEPTEMBER 26-OCTOBER 4, 1986,

AND AUGUST 14-17, 1987, IN ILLINOIS

By G.O. Balding and A.L. Ishii

ABSTRACT

During the record-setting floods of September 26-October 4, 1986, and August 14-17, 1987, in Illinois, recurrence intervals of stream discharges exceeded 100 years in some locations. This report includes descriptions of the conditions preceding the storms, the spatial and temporal distributions of rainfall during the storms, and the resulting stage and discharge data for affected streams in Illinois.

The two storm periods differed. The storms of October 2-3, 1986, which triggered the major flooding, were widespread but varied in intensity and duration and were preceded by 2 weeks of nearly continuous rainfall. The storms of August 13-14, 1987, were more localized, more intense, and of shorter duration. Peak discharges of record were recorded at nine stations during the 1986 floods; recurrence intervals of four of the peak discharges exceeded 100 years. Most of the flooding in 1986 was confined to the Illinois River basin. In the 1987 flooding, 11 peak discharges of record were recorded; recurrence intervals of 10 of the peak discharges exceeded 100 years. The flooding in 1987 was confined to the Des Plaines River basin in northeastern Illinois. Antecedent-rainfall data indicate that the antecedent soil moisture exerted a more significant influence in the 1986 flooding than it did in the 1987 flooding.

INTRODUCTION

State and local water-resource planners typically design and evaluate structures with reference to rainfall data from storms that result in floods of 50- to 100-year recurrence intervals. Hydrologic data from such storms, coupled with the available associated climatologic data and a mathematical model, are commonly used to predict drainage-basin response to large storms. A detailed description of the characteristics and responses of large storms is a necessary prerequisite for application of storm data to planning, design, and management of roads, bridges, culverts, and dams. In 1987, the U.S. Geological Survey (USGS), in cooperation with the Illinois Department of Transportation, Division of Water Resources, began a study of the major storms of June 1981 and December 1982 and the corresponding floods (recurrence intervals of 50 to 100 years) (Ishii, 1991). The cooperative effort was later expanded to include the storms and floods of September-October 1986 and August 1987.

Major storms of October 2-3, 1986, and August 13-14, 1987, in Illinois, though of contrasting types, caused record floods and stream discharges with recurrence intervals exceeding 100 years. The storms of October 2-3, 1986, were associated with a cold front that stalled over northern and central Illinois from September 28 through October 3. The storms varied in intensity and duration over a large area. The magnitude of the resulting floods was caused by 2 weeks of nearly continuous rainfall that preceded the October 2-3 storms, as well as the storm rainfall. Antecedent soil moisture exerted a significant influence in the magnitude of the flooding. The storms of August 13-14, 1987, were convective storms of short duration and high intensity over a small area in northeastern Illinois; antecedent rainfall was not an important factor in the resulting floods.

This study effort involved the analysis of data from the National Weather Service precipitation-data network (fig. 1) and the USGS streamflow-gaging- station network in Illinois (figs. 2 and 3).

Purpose and Scope

This report describes the storms and the resulting floods in Illinois during September 17-October 3, 1986, and August 13-14, 1987. The report summarizes antecedent rainfall for the storms, describes the temporal and spatial distributions of rainfall during the storms, and provides hydrologic data and analyses of the resulting floods. Meteorological data presented include synoptic summaries, antecedent-rainfall maps, storm-rainfall maps, and graphs of cumulative rainfall. Hydrologic data and analyses include discharge hydrographs, streamflow data, recurrence intervals, and comparisons of observed peak discharges to previous flood records.

Acknowledgments

The authors gratefully acknowledge the Metropolitan Water Reclamation District of Greater Chicago for furnishing precipitation data.

FLOODS OF SEPTEMBER 26-OCTOBER 4, 1986

During the period September 26-October 4, 1986, intense thunderstorms caused severe flooding in northeastern Illinois and scattered flooding across parts of western, central, and southwestern Illinois (figJ 4). Damage was most severe in Lake and Cook Counties in northeastern Illinois.

Governor James R. Thompson declared the following eight counties as State disaster areas: Lake, Kane, Du Page, and parts oif Cook and McHenry Counties, in northeastern Illinois; Tazewell County, in central Illinois; Adams County, in western Illinois; and St. Glair County, in southwestern Illinois. In a letter to the Federal Emergency Management Agency (FEMA) , Governor Thompson declared the flood damage to property in northeastern Illinois to be $34.6 million. Theflooding caused structural damage to about 1,000 residents, and affected about 260 businesses in

houses, displaced about 15,000 the Chicago area. In Tazewell

1581

42«_>10_177| , 122 jl 4gt___f 31\_ f-.-zrfc--& ;«!11.73,*A ,178 128. i8ij- j Ci 35

91 . 147^ >---J4_ .-J- ^ I,

'r- ^V .61 <oo ,00 h i *82 '^9 104} " b1 133 123 1 27 132. 180 * ' *- } **

117

89

'631 105 |

Ti_^

100

97! 601

88. 18h-i-v-j."__L138185/35

103

131

159 83

Jli 136 | I

!»!135 169

94183 19,

12' sr*

M4164C

,139

182 149>1

74

98

«* 10V,-" ..119 I

, __93| ,f . 45 _?2_J

rr"7-i 537-142* j'O

134 ' 112,92I--

10

77

'154

m . 881, *80( ' 1 \ ^ ft7189V U J J * 87

>157 r

^

'40. *161

,192|

174- .165 1108 99

39° ~N

EXPLANATION

NATIONAL WEATHER SERVICE DIVISION BOUNDARY

fe£| 21.

LI8 1251 -H \ Ji ._ 1751 rxv

190

47 i 69* r- -

153 175rT2-»"i. 25- I 68 ) 25

17I DIVISION BOUNDARY /" ^ <y\ 11 Ix*

170 RAINFALL GAGING STATION AND / »\ ! H6 * <IDENTIFICATION NUMBER V 68 ^ IJ94 193 114

,-iai^ . in ~ * -^

"84V30/

195 «

54

Base from U.S. Geological Survey State base map, 1974

44

.N \155 0 20 40 60 MILESI . ' . .' '

0 20 40 60 KILOMETERS

Figure 1. Location of rainfall-gaging stations in Illinois (numbers are referenced to tables 1 and 4 and figures 7, 8, and 14).

40°-

05414820\; 05435500

SS-SxWt:-:-:!figure 3|

^iSnfor this area || iof05420500

J 05446500

0557036005570380

05569500

0556800005580000055815000558050005J58^00oV-55e9°

05588000

05587900,0

EXPLANATION05567500 STREAMFLOW-GAGING STATION

^ AND DOWNSTREAM-ORDER NUMBER

Base from U.S. Geotogical Survey State base map, 1974

60 MILES


Figure 2. Location and downstream-order number of streamflow-gaging stations in Illinois from which data were used.

88°30'

Lake Michigan

05535000

5535070

05529500

T *^05540095

^5540200

05536500 05536275,

' - 05536215

05536255

EXPLANATION

05550500 STREAMFLOW-GAGING STATION A AND DOWNSTREAM-ORDER

NUMBER

Base from U.S. Geological Survey State base map, 1974 5 10 15 KILOMETERS

Figure 3. Location and downstream-order number of streamflow-gaging stations in northeastern Illinois from which data were used.

fWest-South'west ' i 39« \x _ __ East-Southwest

H.

Chicago

EXPLANATIONP7I SEPTEMBER-OCTOBER 1986 ^ p :

81 AUGUST 1987 ^^^Southwest J I NATIONAL WEATHER SERVICE ~T\ /"

L- DIVISION BOUNDARY

West DIVISION NAME

ADAMS COUNTY NAME


\\ 0 20 40 60 MILESK- is t i i___i


Figure 4. Counties designated as disaster areaB as a result of the floods of September 26-October 4, 1986, and August 14-17, 1987.

County, 10,000 acres of farmland were flooded, whereas in Adams County, 7,000 acres of unharvested crops were submerged. In St. Clair County, 425 people were evacuated from a public-housing project in East St. Louis (Enstad and Karwath, 1986).

On October 7, 1986, the President declared that Illinois had suffered a major disaster because of the severe storms and flooding. Preliminary damage estimates for the State totaled nearly $50 million and included damage to 4,000 homes, more than 600 businesses, and dozens of public structures and facilities (Federal Emergency Management Agency, 1986, p. 3).

Meteorological Setting

During the last half of September and the first few days of October, several cyclonic storm systems developed in the western United States and slowly moved east across Illinois as the polar jet stream advanced southward and retreated. Throughout the period, temperatures in Illinois were higher than normal, with daily highs of about 82°F and lows of about 65°F. Temperatures cooled to about 72 and 62°F for the daily highs and lows, respectively, by October 2 and 3 as a cold front moved in.

On September 15, a cyclone formed in the western United States, as the jet stream was over northern Illinois. The cyclone intensified on September 16 and 17 (fig. 5) and then moved eastward and dissipated on September 18 (fig. 5). The jet stream continued to cut across northern Illinois during September 19-21. The associated stationary front and unstable moist air caused convective rain showers daily in the warm air mass north of the front and the cooler air mass south of the front (fig. 5).

On September 22 and 23, a cyclonic system centered in Canada kept Illinois in a warm-air sector between a warm front to the east and a cold front to the west. Beginning at about 0600 hours central standard time (c.s.t.) September 24, a cyclone centered on Wyoming began to intensify and move northward (fig. 5). By September 25, Illinois was again within the warm air mass between an eastern warm front and a western cold front (fig. 5) . As the cyclone moved eastward over Canada, the cold front remained west of Illinois and created the potential for rainfall in Illinois ahead of the front (fig. 5).

On September 26 and 27, another cyclonic storm system developed, and Illinois was again in the central warm-air sector. On September 28, the system became associated with an anticyclone that held the warm-air sector in place until the anticyclone moved eastward and a new cyclonic system developed in Nebraska at about 1800 hours c.s.t. September 28. At about 1700 hours c.s.t. September 29, the western cold front finally entered Illinois, bringing heavy rains. The cold front moved south to central Illinois and remained there until October 4. Illinois had thus been in the warm-air sector between two fronts during September 22-29. Warm, moist, low-level winds from the Gulf of Mexico provided the moisture for the heavy precipitation (Dietrich, 1989, p. 5). The final heavy rain showers associated with the cold front on October 2 and 3 (fig. 5) added to already saturated ground and swollen rivers.

140° 130° 120° 110° 100° 90° 80° 70 60°

EXPLANATION

^v^- COLD FRONT

*-^- WARM FRONT

H^- STATIONARY FRONT

-1008- LINE OF EQUAL BAROMETRIC PRESSURE-Interval 4 millibars

L CENTER OF LOW PRESSURE

H CENTER OF HIGH PRESSURE

30

25

0800 September 17

140° 130° 120° 110° 100° 90

SCALE AT 40°N 0 400 MILES

0 400 KILOMETERS

80° 70° 60°

30

25

0800 September 18 SCALE AT 40°N

0 400 MILES

0 400 KILOMETERS

Figure 5. Surface weather over the United1 States at 0800 hours central standard time on September 17, 18, 21, 24, 25, 30, and October 3, 1986. (Data from the National Weather Service, 1986a-c.)

140° 130° 120° 110° 100° 90

30

25

0800 September 21

140° 130° 120° 110° 100° 90° 80°

SCALE AT 40°N 0 400 MILES

0 400 KILOMETERS

70° 60°

50°

25

0800 September 24 SCALE AT 40"N 0^400 MILES

0 400 KILOMETERS

EXPLANATION

">v^ COLD FRONT

-*-^- WARM FRONT

- ^ STATIONARY FRONT

-1008- LINE OF EQUAL BAROMETRIC PRESSURE--lntervaJ 4 millibars



Figure 5. Surface weather over the United States at 0800 hours central standard time on September 17, 18, 21, 24, 25, 30, and October 3, 1986 Continued. (Data from the National Weather Service, 1986a-c.)

140° 130° 120° 110° 100° 90° 80° 70

50

45

EXPLANATION

->^^ COLD FRONT

-»-^- WARM FRONT

-^T^ STATIONARY FRONT

-1008- LINE OF EQUAL BAROMETRIC PRESSURE--Interval 4 millibars



25

0800 September 25 SCALE AT 40 °N

9 400 MIL^S

0 400 KILOMETERS

140° 130° 120° 110° 100° 90

30

25

0800 September 30 SCALE AT 40° N

0 400 MILES

0 400 KILOM6TERS

Figure 5. Surface weather over the United States at 0800 hours central standard time on September 17, 18, 21, 24, 25, 30, and October 3, 1986 (pontinued. (Data from the National Weather Service,,1986a-c.)

10

140° 130° 120° 110° 100° 90° 80 60°

30

25

0800 October 3 SCALE AT 40° N 0 400 MILES

400 KILOMETERS

EXPLANATION

COLD FRONT

WARM FRONT

STATIONARY FRONT




Figure 5. Surface weather over the United States at 0800 hours central standard time on September 17, 18, 21, 24, 25, 30, and October 3, 1986 Continued. (Data from the National Weather Service, 1986a-c.)

11

Characteristics of Rainfall Distribution

Rainfall across the middle of the State during September was 184 percent of normal in eastern Illinois, 220 percent of normal in central Illinois, and 216 percent of normal in western Illinois. The northern part of the State was the hardest hit; rainfall was 251 percent of normal in the northeast and 235 percent of normal in the northwest (R.G. Semonin, Illinois State Water Survey, written commun., 1986). j

During September 18-20, when the first warm air mass was stalled over central Illinois, accumulated rainfall in northeastern Illinois amounted to 0.10 in. or less around Antioch (5) 1 and Waukisgan (170) to almost 1.5 in. at Chicago O'Hare International Airport (32) and moire than 2.1 in. at Joliet Brandon Road Dam (82). Rainfall elsewhere in the Statfe ranged from about 0.5 to more than 4.0 in. in the northwestern part, about 0.7 to more than 4.2 in. in the western part, and about 2.0 to almost 7.2 in. in the central part. During September 25-27, accumulated rainfall across northern Illinois amounted to 4.18 in. at Freeport (55), 5.39 in. at Antioch (5), 5.43 in. at Marengo (95), 7.70 in. at Waukegan (170), and 3.62 in. at Wheaton (173).

Total antecedent rainfall for the respective 10- and 5-day periods preceding the storms of October 2-4 are shown in figure 6. Antecedent rainfall may help indicate the ability of the soils to receive additional rainfall as infiltration. Long-term antecedent rainfall aids in the assessment of streamflows. As much as 3.46 in. of rain fell in the northwestern parft of the State during the 5-day period September 28-October 2. Elsewhere in the State, as much as 3.91 in. of rain fell in the northeastern part, 4.15 in. felll in the western part, 2.29 in.fell in the central part, 5.65 in. fell in the in the west-southwestern part.

eastern part, and 4.47 in. fell

The temporal and spatial distributions of [the storm rainfall indicate that the first showers occurred in the western and qentral parts of the State during September 19-20 as a result of the stationary front over central Illinois. These intense storms were of short duration; but, as the front moved northward, the duration and intensity of the storms increased (figs. 7 and 8). The rainfall recurrence intervals (RI's) for the 10- and 3-day storm periods of September 25- October 4 and October 2-4, for rainfall at selected rainfall-gaging stations, are listed in table 1 (at back of report). A comparison of the two periods shows that the RI's for the 10-day storm period were much higher than those for the3-day storm period, indicating that the 10-day in the flooding that took place in October.

storm period played a major part

i

The spatial distribution of the 3-day total! storm rainfall is shown on plate 1A (in pocket). The heaviest rains were ii} and near Avon (8) in western Illinois; Chenoa (29), Lacon (88), and Mackinaw (93) in central Illinois; and Fairbury (51) in eastern Illinois (fig. 1) . ,

lumbers in parentheses correspond to location numbers in figure 1.

12

7.0

38

EXPLANATION

LINE OF EQUAL RAINFALL Interval 0.5 inches


20 40 60 MILES


Figure 6. Total rainfall for storms of (A) 10-day antecedent period September 23-October 2 and (B) 5-day antecedent period September 28-October 2, 1986. (Data from the National Oceanic and Atmospheric Administration, I986a-m.)

General distribution only. Not all data points used.

13

B

40° '

EXPLANATION

4.0 LINE OF EQUAL RAINFALL Interval 0.5 inches


20 40 60 MILES


Figure 6. Total rainfall for storms of (A) 10-day antecedent periodSeptember 23-October 2 and (B) September 28-October 2, 1986

5-day antecedent period Continued. (Data from the

National Oceanic and Atmospheric Administration , 1986a-m.)

General distribution only. Not all data points used.

14

14

12

10

8

6

4

2

0

i I i r Freeport waste wtr pit (55)- Rockford WSO AP (146) Morrison (107)- Galva (59)

.... Paw Paw

NORTHWEST

Joliet Brandon Road Dam (82)- -- Chicago University (33) --Wheaton 3 SE (173) - Marseilles Lock Waukegan (170)- - Antioch 2 NW ~ - Marengo (95)

(97)

LUXo

< u_

<DC

16

14

12

10

8

6

4

2

0

La Harpe (89) Monmouth (105)-Quincy FAA AP (139) Avon 5 NE (8)

Havana 4 NNE (74) Lincoln (92) Princeville (138)- - Minonk (103)---- Normal (119)

18 20 22 24 26 28 30 1 2 4 6 16 18 20 22 24 26 28 30 1 2 4 6SEPTEMBER OCTOBER SEPTEMBER OCTOBER

1986 1986

LUX O

< cc

Springfield WSO AP (157) Griggsville (70)

16 18 20 22 24 26 28 30 1 2 4 6 SEPTEMBER OCTOBER

1986

Figure 7. Cumulative daily rainfall at selected rainfall-gaging stations in Illinois, September 17-October 5, 1986. (Numbers refer to locations in figure 1. Data from the National Oceanic and Atmospheric Administration, 1986a-b.)

15

0.8

cnUJ

0 0.6z

zj 0.4

<ULZ < 0.2oc

0.0

6

cnUJXoZ 4

Z

_r_J£ 2Z< OC

0

4

COUJ

5 3z

z

RAINFALL,

-* i\

0

: .......pu|ton [)am 13 ( 56) /

: - - -Lanark (177) _ / '..... Rockford WSO AP (146) /

j _ _ _ ;/ /f -i ...- - »

;' /, ' :

7 .

NORTHWEST : .... i .,,..

1200 2400 1200 2400 1200

Jacksonville 2 E (80)------- Pittsfield 2 (189) -Quincy Dam 21 (140)

^ /- -/

/ : / :

ii ..,-'"'

'. / , -- '

: /':"' r^ ̂ :L.....JJ WEST SOUTHWEST and WEST

....// i ..... i ..... i ..... i .. i .. i .....

1200 2400 1200 2400 1200

' i i i i i

'. Farmer City 2 W (53) '.- -Mason City 1 NW (98)

'_ - - -Peoria WSO AP (131)

s/

/ .............. -- -'.-'"'

! .'} '_ ;/

~ ; l ;' i

:. . / CENTRAL -

1200 2400 1200 2400 1200 OCT 2 OCT 3 OCT 4

3

2

1

0

5

4

3

2

1

0

1.0

. O

.0

0.4

0.2

0.0

, . , , , 1 . , . . . 1 , , . , , 1 , , , , , 1 , .... I .....

Chicago O'Hare WSO AP (32)

' - - - Chicago Midway AP 3 SW (34)

,____^ ---

f' // »

Ir'l

7I? NORTHEAST -

1200 2400 1200 2400 1200

Morrisonville (108). ----- -Nokomis (190)7- -i- -Springfield WSO AP (157) . -

t

* :' :

\ /~^

- if."'"'/

' J^- ' ~ "I -^~-~-~-~S WEST SOUTHWEST ]

. . 1 / J . , . : 1 .'. , , 1 , , , . 1 , . . , 1 . . . .

1200 2400 1200 2400 1200

i i i ' i i

i Hoopeston 1 NE (77)' ----!- -Rantoul (142) -r - -t- -Urbana (162) ,..... ..... ......

I ' / '.

: : / ' :

f 7 ? EAST "" . . . . 1 . /. / . .'1 . . , , 1 . , , , 1 . . . . 1 . , . . "

1200 2400 1200 2400 1200 OCT 2 OCT 3 OCT 4

TIME, IN HOURS (central standard time) TIME, IN HOURS (central standard time)

Figure 8. Cumulative hourly rainfall at selected rainfall-gaging stations in Illinois, October 2-4 , 1986. (lumbers refer to locations in figure 1. Data from the National Oceanic and Atmospheric Administration, 1986n.)

16

Description and Analysis of Floods

Major flooding took place in the Des Plaines River basin. The heavy rains resulted in peak discharges of record on the Des Plaines River, Skokie River, and St. Joseph Creek. In the Fox River basin, peak discharges of record were recorded on Nippersink Creek and Boone Creek. In the Vermilion River basin, a peak discharge of record was reached on the North Fork Vermilion River. High discharges were recorded at other streams--Kickapoo Creek, Mackinaw River, Spoon River, Evelyn Branch, Drowning Fork, and La Moine River--but these discharges were not peak discharges of record. The previously recorded maximum peak stages and discharges, and the peak stages and discharges determined at streamflow- gaging stations during the flooding of late September and early October, are listed in table 2 (at back of report). The RI's of the floods were determined by methods recommended by the Interagency Advisory Committee on Water Data, Hydrology Subcommittee (1982) and regional relations described by Curtis (1987). The RI's of the floods also are listed in table 2, and their spatial distribution is shown in figures 9 and 10. Streamflow hydrographs for selected sites in the Illinois River basin where RI's were 15 years or more are shown in figure 11. A comparison of the rainfall RI's (listed in table 1) with the flood RI's (listed in table 2) indicates that the severity of the flooding is reflected more in the RI's of 10-day rainfall than in the RI's of 3-day rainfall. The RI's of the 3- day rainfall were much smaller than the RI's of the flood.

Ohio River Basin

No peak discharges of record were recorded for Illinois streams tributary to the Ohio River. Streamf low in the eastern and southeastern parts of the State reflected the small amount of rainfall there; RI's of peak discharges were less than 2 years.

Upper Mississippi River Basin Above The Illinois River

No peak discharges of record were recorded for Illinois streams tributary to the upper Mississippi River above the Illinois River. Most of the peak discharges resulting from the storms of late September to early October had RI's of 5 years or less. Exceptions were the Sinsinawa River near Menominee (05414820), on September 29, where the peak discharge of 6,660 ft3/s had an RI of 7 years, and Bear Creek near Marcelline (05495500), on October 3, where the peak discharge of 20,700 ft3/s had an RI of 15 years. On the main stem of the Mississippi River, the peak discharge of 201,000 ft3/s at Clinton, Iowa (05420500), on October 6, had an RI of 10 years, whereas the peak discharge of 268,000 ft3/s at Keokuk, Iowa (05474500), on October 6, had an RI of 20 years.

Illinois River Basin

In the Kankakee River basin, no peak discharges of record were recorded. The only annual peak discharge that was recorded during the flood period was on the Kankakee River at Momence (05520500); the RI was less than 2 years.

17

40°-

39°-

EXPLANATION

RECURRENCE INTERVAL OF FLOOD AT STREAMFLOW- GAGING STATIONS, IN YEARS

O Less than 2

O 2-10

O 11 '25

26-50

51-100

A Greater than 100


0 20 40 60 MILES


Figure 9. Recurrence intervals for the floods of late September and early October 1986 at selected streamflow-gaging stations in Illinois (numbers are referenced to table 2) .

18

88°30'

Lake Michigan

EXPLANATION

RECURRENCE INTERVAL OF FLOOD AT STREAMFLOW- GAGING STATIONS. IN YEARS

O Less than 2

O 2-10

O 11 '25

26-50

51-100

A Greater than 100

Base from U.S. Geological Survey State base map, 1974 5 10 15 KILOMETERS

Figure 10. Recurrence intervals for the floods of late September and early October 1986 at selected streamflow-gaging stations in north eastern Illinois (numbers are referenced to table 2).

19

Q 4,000

o

§

ccLUQ.

LU

3,500 -

3.000 -

2,500 -

Om3 O

2,000 -

~ 1,500

LU

I O COo

ooLU CO

ccLU Q.

LU

Omz> o

LU

X O COo

1 ,000

500

i l I I i i i i i i i i i i i i i i i i I

05528000 Des Plaines River near Gurnee (Map number 21 in figure 10 and table 2)

Missing data

5,000 i i i i i i i r

4.000

"J 3,000

2,000

1,000

05529000 Des (Map number

i i i i i i i i i i i

Plaines River near Des Plaines 23 in figure 10 and table 2)

i i i i i i i i i i22 24 26 28 30 1 2 4 6 8 10 12 14

SEPTEMBER t OCTOBER1986 i

Figure 11. Streamflow for selected streams in the Illinois River basin, September-October 1986.

20

QZ OoLLJ CO

tr in a.

UJ LU

oCQID O

UJO cc

oCOa

500

400

300

200 ~

1 00

i I r i F i i i i i i i i i r05535000 Skokie River at Lake Forest (Map number 33 in figure 10 and table 2)

i i i r

QZ OoLU CO DC

LU LU

O CQ

O COo

3,000

2,500

2,000

== 1,500

OZ 1,000LtToDC<

500

I I I I I T i I I I T I I ! I I I

05548280 Nippersink Creek near Spring Grove (Map number 48 in figure 10 and table 2)

i i i i i i i i i i i i i i i i i i i i i i i

22 24 26 28 301 2 4 68101214

SEPTEMBER OCTOBER1986

Figure 11. Streamflow for selected streams in the Illinois River basin, September-October 1986 Continued.

21

o z o o mCO

cc 111 a.

LLI LLI LL

Oar> o

LLI

I O COO

6.500

6.000

5,500

5,000

4,500

4,000

3,500

i I I I I I I I I I 1 105550000

i i i i i i i i i i ( :ox River at Algonquin

(Map numbor 50 in figure 10 and table 2)

i i i i i

O OLU CO

CC LLI Q.

LU U.

Om=> o

z

LU O DC < X O COO

40,000

35,000

30,000

25,000

20,000

15,000

10,000

5,000

05567500 Mackinaw River near Congerville (Map number 58 in figure 9 and table 2}

i i i i i22 24 26 28 30 1 2

SEPTEMBER

8 10 12 14

OCTOBER

1986


22

oz o oLU CO

ccLU O.

LU LU U.

30,000

25,000

20,000

:=: 15,000

oz 10,000

LUocc<XoCOo

5,000

I I I I I I I I I I I I I I I I I I I I I I I05584500 La Moine River at Colmar (Map number 77 in figure 9 and table 2)

22 24 26 28 30 1 2 4 6 8 10 12 14

SEPTEMBER OCTOBER1986


The streamflow-gaging station that is the farthest upstream on the Des Plaines River in Illinois is at Russell (05527800), where the peak discharge of 1,640 ft3/s, on September 27, corresponds to an RI of 9 years. The maximum discharge for 41 years of record, 3,530 ft3/s at a stage of 11.95 ft, occurred on September 27 on the Des Plaines River near Gurnee (05528000) ; the RI was greater than 100 years. The discharge near Gurnee exceeded the previous maximum of April 1960 by 460 ft3/s; stage was 1.31 ft higher. Downstream, a discharge of 4,900 ft3/s was recorded on the Des Plaines River near Des Plaines (05529000) on October 1. This peak discharge of record corresponds to a 50-year RI and exceeds the previous maximum of 46 years of record by 230 ft3/s; stage of^the previous maximum peak discharge was exceeded by 2.32 ft. The Des Plaines River at Riverside (05532500) peaked on October 3 at a discharge of 7,590 ft3/s and a stage of 8.87 ft. The peak at Riverside corresponded to an RI of 70 years and exceeded the maximum peak discharge for 43 years of record by 1,080 ft3/s and the corresponding stage by 0.59 ft. The maximum discharge (492 ft3/s at a stage of 8.27 ft) for 35 years of record for Skokie River at Lake Forest (05535000) occurred on September 26, had an RI exceeding 100 years, and surpassed the previous peak discharge of July 1982 by 57 ft3/s but at a stage 0.08 ft lower. At the next streamf low-gaging station downstream, Skokie River near Highland Park (05535070), the peak discharge recorded on September 30 had an RI of 9 years. At the North Branch Chicago River at Niles (05536000), the peak discharge of 1,800 ft3/s on September 29 corresponded to an RI of 20 years. Station data for

23

Des Plaines River near Gurnee (05528000), Des Plaines River near Des Plaines (05529000), and Skokie River at Lake Forest (05535000) are listed in table 3 (at back of report). (Times shown in table 3 are central daylight time rather than central standard time, which is used elsewhere in this report).

I In the Fox River basin, peak discharges of record were recorded on two

tributaries to the Fox River. At Nippersink Creek near Spring Grove (05548280 with 21 years of record), the discharge of 2,910 ft3/s recorded on September 26 exceeded the previous maximum by 480 f t3/s, and the corresponding stage was exceeded by 1.23 ft; the RI was 35 years. At Boons Creek near McHenry (05549000, 39 years of record) , the discharge of 345 ft3/s i(on September 27) exceeded the previous maximum by 69 ft3/s, and the corresponding stage was exceeded by 0.50 ft; the RI was 60 years. Flow from these two tributaries contributed to the peak flood discharge of 6,170 ft3/s on October 3 for the Fox River at Algonquin (05550000), which had an RI of 25 years. Downstream, the Fox River at its mouth at Dayton (05552500) peaked on October 4 at 10,700 ft3/s, corresponding to an RI of less than 2 years. Station data for Nippersink Creek near Spring Grove (05548280) and Fox River at Algonquin (05550000) are listed in table 3.

In the Vermilion River basin, a peak discharge of record was recorded on October 3 at North Fork Vermilion River near Charlotte (05554000, 44 years of record). The record discharge of 4,900 ft3/s (RI of 20 years) exceeded the previous maximum of May 1970 by 350 f t3/s, and the corresponding stage was exceeded by 0.96 ft. Downstream, the Vermilion River at Pontiac (05554500) and near Leonore (05555300) peaked on October 4 and $; RI' s of peak discharges were 5 and 7 years, respectively. '

In the Kickapoo Creek basin, Kickapoo Creek near Kickapoo (05563000, 42 years of record) crested at a record stage of 18.85 ft on October 3, exceeding the previous record set in July 1967 by 1.77 ft. The record stage exceeded the existing stage-discharge rating curve, but it wa|s estimated to be equivalent to a discharge exceeding 30,000 ft3/s and equal to! or greater than a 50-year RI. Downstream, Kickapoo Creek at Peoria (05563500) peaked at 19,700 ft3/s; the RI was 15 years. i

In the Mackinaw River basin, no peak discharges of record were recorded, but the peak discharge at Panther Creek near El Paso (05567000) on October 3 corresponded to a 15-year RI. At the Mackinaw River near Congerville (05567500) , the recorded discharge of 35,300 ft3/s on October! 4 corresponded to a 50-year RI. Downstream, the Mackinaw River near Green Valley (05568000) peaked at a discharge of 23,400 ft3/s, also on October 4, which corresponded to a 15-year RI. Levee breaks were reported to have occurred on October 4 (Graff, 1986), which, in part, may account for the 10,000 acres of farmland flooded in Tazewell County, and for the peak discharge near Green Valley being less than that upstream near Congerville. Station data for Mackinaw River r.ear Congerville (05567500) are listed in table 3.

In the Spoon River basin, no peak discharges of record were recorded, but Spoon River at London Mills (05569500) peaked on October 4 at 26,400 ft3/s, a discharge that corresponded to a 30-year RI. Downstream at Seville (05570000), the peak was recorded on October 5 at 21,400 ft3/s (RI of 7 years). On October 3, at Evelyn Branch near Bryant (05570360) the discharge of 276 ft 3/s

24

exceeded the 100-year RI but did not exceed the discharge of record of 325 ft3/s established the previous June. Other peak discharges recorded in the basin during the flood had RI's of 3 years or less.

In the Sangamon River basin, peak discharges generally were less than the annual flood (RI less than 2 years). At Sugar Creek near Bloomington (05580950) and near Hartsburg (05581500), however, peaks corresponded to RI's of 4 and 8 years, respectively.

No peak discharge of record was recorded at any stream site in the La Moine River basin, but some flood peaks of note did occur. At Drowning Fork at Bushnell (05584400), a peak stage of 14.07 ft exceeded the previous maximum of 12.92 ft (3,500 ft3/s) and was off the stage-discharge rating curve. It was estimated that the peak discharge at Bushnell exceeded the 100-year RI. Peak discharges of 28,700 ft3/^ at the La Moine River at Colmar (05584500) and 23,400 ft3/s at Ripley (05585000) corresponded to RI's of 30 and 35 years, respectively. Station data for La Moine River at Colmar (05584500) are listed in table 3.

Upper Mississippi River Basin Below The Illinois River

The Mississippi River at Grafton (05587450) peaked at 423,000 ft3/s on October 10; the corresponding RI was less than 2 years. Streams in the Cahokia Creek and Kaskaskia River basins peaked between September 30 and October 7, and these discharges also had RI's of less than 2 years.

FLOODS OF AUGUST 14-17, 1987

During August 13-14, 1987, intense thunderstorms caused severe flooding in northeastern Illinois and minor flooding in northwestern Illinois. Damage was most severe in the communities along the Des Plaines River and Salt Creek. In Cook County, about 8,900 buildings were affected by flooding or sewer backup; in Du Page County, -about 7,500 buildings were affected. The total number of single-family units affected was about 11,500. Private-property damage was estimated at $53 million, and public-property damage was estimated at $9.4 million (Curtis, 1990, p. 50). The flooding claimed three lives in the Chicago area and a fourth near Rockford (National Oceanic and Atmospheric Administration, 1987a, p. 27). On August 14, Governor James R. Thompson declared Cook and Du Page Counties State disaster areas (fig. 4). The counties were declared Federal disaster areas on August 21, 1987 (Federal Emergency Management Agency, 1987, p. 3). The effect of flooding on transportation to and from Chicago O'Hare International Airport is shown in figure 12.

Meteorological Setting

On the evening of August 13, 1987, a stationary front was located across northern Missouri and Illinois through central-eastern Michigan. The surface analysis for 2100 hours c.s.t. on August 13 shows that all of Illinois, except the extreme northwest, was in the warm air mass southeast of the front (fig. 13).

25

fO cr>

Figure 12. ' Vehicles on the

Kennedy Expressway an

d a

southbound Chicago Transit Authority train

stranded at th

e Addison Street overpass between downtown Chicago and Chicago O'Hare

International Ai

rpor

t, August 14

, 1987.

(©Copyrighted, Chicago Tribune Company,

all

righ

ts rese

rved

, used wi

th permission.)

140° 130° 120° 110° 100° 90 80° 70°

35

30

25

2100 August 13 SCALE AT 40°N 0 400 MILES

400 KILOMETERS

140° 130° 120° 110° 100° 90° 80° 70° 60°

50'

45'

40'

35'

30'

25'

0600 August 14 SCALE AT 40°N (3^400 MILES

0 400 KILOMETERS

EXPLANATION

^_^ COLD FRONT

~^- WARM FRONT

*^ STATIONARY FRONT


CENTER OF LOW PRESSURE

CENTER OF HIGH PRESSURE

STUDY AREA

Figure 13. Surface weather over the United States at 2100 hours central standard time on August 13 and at 0600 hours central standard time on August 14, 1987. (National Weather Service, written commun., 1988 .)

27

The temperatures on both sides of the front were about 75°F; dewpoints were only 1-2°F lower south of the front but were as much as 10°F lower in the cold air mass north of the front. The warm air mass was at or near saturation as far as 6 mi above the Earth's surface. A short squal . line of convective storms was moving northeastward from central Illinois (Herzlock, 1989, p. 11). This situation set the stage for rapid convective grovth and heavy rainfall that began at 2115 hours c.s.t. on August 13; by 2130 hours c.s.t., the rain subsided. The second rainfall episode, which began at 0115 hours c.s.t. on August 14, was not accompanied by a major change in the surface weather; this episode ended at about 0230 hours c.s.t. The surface weather at 0600 hours c.s.t. on August 14 is shown in figure 13. Illinois continued to be in the warm saturated air mass. The final rainfall episode began at 0615 hours c.s.lt. By about 0900 hours c.s.t., the convective forces leading to the heavy raiinfall had begun to dissipate. Rainfall was light and scattered for the rest o)f the day.

Characteristics of Rainfall Distribution

Rainfall across the northern part of the State during August was 255 percent of normal in the northwest and 286 percent of normal in the northeast. Rainfall across the middle of the State was 132 percent of normal in the west, 113 percent of normal in the central part, and 171 percent of normal in the east. These above-normal percentages were largely the result of storms in the middle of themonth and again at the end of the month (R.G. Survey, written commun., 1987).

Semonin, Illinois State Water

During the period August 9-13, only 1-2 in. of rain fell in the northwestern part of the State. Elsewhere in the State, as much as 2.8 in. of rain fell at Chicago O'Hare International Airport (32), in the northeastern part; 3.39 in. fell at Quincy (139), in the western part; 0.69 In. fell at Normal (119), in the central part; and 1.67 in. fell at Kankakee (83), in the eastern part.

I The temporal and spatial distributions of the storm rainfall indicate that

the first showers of the storm period occurred in the northwestern and western parts of the State. Plots of cumulative rainfall (fig. 14) indicate that the early, scattered rainfall on August 13, in western Illinois, was of low intensity. By midafternoon, rainfall activity increased in the eastern and central parts of the State. At approximately 2015 hours c.s.t. on August 13, the first high-intensity storm hit northeastern Illinois with 2.51 in. of rainfall accumulation in just over an hour. Thunders torus repeatedly formed over Du Page County and moved northeastward over Cook and southern Lake Counties. Heavy rain fell in three distinct periods starting at approximately 2115 hours c.s.t. on August 13, at approximately 0100 hours c.s.t. or. August 14, and at approximately 0615 hours c.s.t. on August 14. About 3 in. o£ rain fell during each 1-2 hour period (fig. 14). By 1245 hours c.s.t. on August 14, Chicago O'Hare International Airport had received 9.35 in. of rain--an unprecedented amount in the 116 years of record--surpassing the city's previous 24-hour rainfall record of 6.24 in. (National Oceanic and Atmospheric Administration, 1987a, p. 27). The previous 24-hour record for Chicago was set on July 13, 1957 (Curtis, 1990, p. 49). The rainfall recurrence intervals for fche 48-hour period of heaviest rainfall, for selected rainfall-gaging stations!, are listed in table 4 (at back of report). Additional, unofficial data collected at rainfall-gaging stations

28

14

c/> 12LU

o 10

8

----Freeport waste wtr pit (55)- -Galva (59) Moline WSO AP (104) ....... Morrison (107)

Paw Paw 1 E (128) - - - Rockford WSO AP (146)

d 6| ^

OC 2

0NORTHWEST

LUXo

< DC

Chicago O'Hare WSO AP (32) Wheaton 3 SE (173)

Waukegan (170) ._._._._. Marengo (95) / Antiocn (5) ' De Kalb (411-

NORTHEAST

10

LUX O

< u.

< oc

Galesburg (58) - - - Golden (64) La Harp (89) - - Monmouth (105)- Quincy FAA AP (139)- - - Avon 5 NE (8)

12 13 14 15 16 17 18 19 20

Figure 14. Cumulative daily (A) and hourly (B) rainfall at selected rainfall-gaging stations in Illinois, August 12-20, 1987. (Numbers refer to locations in figure 1. Data from the National Oceanic and Atmospheric Administration, 1987b-g.)

29

BCO UJx o

<DC

CO UJXo

<LUz <

4 ------Fulton Dam 13 (56)

Lanark (177) Prophetstown (178)

3 -

2 -

8 -

6

2 -

McHenry Lock and Dam (100) Chicago Midway

AP 3 SW (34) Chicago O'Hare

WSO AP (32) Chicago University

CO UJXo

<CC

2 -

-----Alexis 1 SW (176)

----- Kewanee 1 E (86)

Moline WSO AP (104)

1200 2400 AUG 13

TIME, IN HOURS (central

1200 AUG 14 standard time)

Figure 14. Cumulative daily (A) and hourly (B) gaging stations in Illinois, August (Numbers refer to locations in figure Oceanic and Atmospheric Administration

rainfall at selected rainfall- 12-20, 1987 Continued.

1. Data from the National 1987b-g.)

30

not operated by the National Weather Service are presented in table 5 (at back of report) and figure 15. The methodology used to capture rain and record the rainfall at the unofficial sites may not be comparable in accuracy to National Weather Service methods.

The spatial distribution of the 2-day total storm rainfall is shown on plate IB (in pocket). The greatest rainfall was in and near Rockford (146) in northwestern Illinois; and Chicago O'Hare International Airport (32), De Kalb (41), and Wheaton (173) in northeastern Illinois.

Description and Analysis of Floods

Within a year of the previous severe flood, major flooding again took place in the Des Plaines River basin. Peak discharges of record were recorded on McDonald Creek, Salt Creek, Addison Creek, and the Des Plaines River. Peak discharges of record also were established on North Branch Chicago River, Skokie River, and West Fork of North Branch Chicago River. In the Du Page River basin, peak discharges of record were recorded on West Branch Du Page River and St. Joseph Creek.

Other streams also were affected by the storms. Their peak stages and discharges, along with their respective RI's, are listed in table 6 (at back of report). The spatial distribution of the RI's is shown in figures 16 and 17. Unlike the 1986 flood previously described, the rainfall and flood RI's for this flood were similar.

Upper Mississippi River Basin Above The Illinois River

No peak discharges of record were recorded in the Rock River basin. The peak discharges that were recorded (RI's of 5 years or less) indicate that few streamflow-gaging stations were near the peak rainfall area.

Illinois River Basin

Eleven peak discharges of record in the Illinois River basin resulted from the storms of August 13-14. Recurrence intervals were greater than 100 years at 10 of those sites. The peak discharges were as much as 1.4 times greater than the 100-year flood discharge (Curtis, 1990, p. 50). All of the new peaks recorded in the Des Plaines River basin were either on the main stem or on tributaries to it. The peak discharge for the Des Plaines River near Gurnee (05528000), on August 14, was less than the annual flood (RI less than 2 years). Downstream, however, inflow from Buffalo Creek, which had a peak discharge of 717 ft3/s (RI of 15 years) near Wheeling (05528500), increased the RI to 7 years at Des Plaines River near Des Plaines (05529000). The severe flooding along the lower reach of the Des Plaines River was caused by the large inflow of water from its tributaries downstream from Des Plaines.

At McDonald Creek near Mount Prospect (05529500), a discharge of 806 ft3/s at a stage of 8.08 ft, the maximum for 36 years of record, was recorded on August 14. The previous maximum discharge was exceeded by 142 f t3/s, and the

31

Glenview Northside North Branch Racine

B 6

0)

I OZ 4

z

iz<cc

87th and Westernr - Calumet

-- Springfield

~

k

1 1

[ j .. , . . . . . , , - v'LSr-T-', r^T

1

.s~

r

\

-

I

^-=f _____

. i .....

1200 2400 AUG 13

TIME, IN HOURS (central

1200 AUG 14 standard time)

Figure 15. Cumulative hourly rainfall at selected rainfall-gaging stations in Cook and Du Page Counties, Illinois, August 13-14, 1987. (Data for (A) and (B) from the Metropolitan Water Reclamation District of Greater Chicago, written commun., 1989; data for (C) from J.J. Duncker, U.S. Geological Survey, written commun., 1991.)

32

41° (


20

20 40 KILOMETERS

EXPLANATION

RECURRENCE INTERVAL OF FLOOD AT STREAMFLOW- GAGING STATIONS. IN YEARS

O Less than 2

O 2-10

Figure 16. Recurrence intervals for the floods of August 14-17, 1987, at selected streamflow-gaging stations in northern Illinois (numbers are referenced to table 6).

33

88°30'

42°

EXPLANATION

RECURRENCE INTERVAL OF FLOOD AT STREAMFLOW- GAGING STATIONS, IN YEARS

O Less than 2

O 2-10

O 11 -25 26-50

51-100

Greater than 100

Lake

Michigan


Figure 17. Recurrence intervals for the floods of August 14-17, 1987, at selected streamflow-gaging stations in northeastern Illinois (numbers are referenced to table 6).

34

corresponding stage was exceeded by 0.50 ft; the RI was 50 years. Downstream, at Weller Creek at Des Plaines (05530000), the peak discharge of 1,490 ft3/s on August 14 corresponded to an RI of 25 years. Salt Creek at Rolling Meadows (05530990) peaked at 1,650 ft3/s (14.03 ft) on August 14. The peak discharge at Rolling Meadows corresponded to an RI 1.4 times greater than a 100-year RI (Curtis, 1990, p. 50) and exceeded the maximum for 14 years of record by 590 ft3/s of discharge and 1.47 ft in stage. Downstream, at Western Springs (05531500), Salt Creek peaked at 3,230 f t3/s, also on August 14; this peak discharge was the maximum for 42 years of record and also corresponded to an RI 1.4 times greater than the 100-year RI (Curtis, 1990, p. 50). Additional rains on August 16 caused Salt Creek at Western Springs to rise to 3,540 ft3/s (10.54 ft), surpassing the new maximum for 42 years of record set 3 days earlier. Addison Creek at Bellwood (05532000) peaked on August 14 at 1,120 ft3/s (12.84 ft) . The peak discharge at Bellwood exceeded the maximum discharge for 37 years of record by 281 ft3/s, and the corresponding stage was exceeded by 2.16 ft; the RI was greater than 100 years. The inflow from these tributaries resulted in a peak discharge of record, 9,770 ft3/s (at 9.90 ft) on the Des Plaines River at Riverside (05532500) on August 15; the discharge corresponded to an RI 1.2 times greater than the 100-year RI (Curtis, 1990, p. 50). Station data for Buffalo Creek near Wheeling (05528500), McDonald Creek near Mount Prospect (05529500), Weller Creek at Des Plaines (05530000) , Salt Creek at Rolling Meadows (05530990) , Salt Creek at Western Springs (05531500), and Des Plaines River at Riverside (05532500) are listed in table 7 (at back of report). (Times given in table 7 are central daylight time rather than central standard time, which is used elsewhere in this report.) Streamflow hydrographs for selected sites in the Des Plaines River basin are shown in figure 18.

Peak discharges of record also were recorded at North Branch Chicago River at Deerfield (05534500) (933 ft3/s at 11.52 ft) and at Niles (05536000) (2,590 ft3/s at 11.35 ft) on August 14. Both discharges exceeded the 100-year RI and the previous maximums for 36 and 37 years of record, respectively. Peak discharges on tributaries to the North Branch Chicago River, Skokie River near Highland Park (05535070), and West Fork of North Branch Chicago River at Northbrook (05535500), also were peak discharges of record. At Skokie River near Highland Park (05535070), peak discharge was 895 ft3/s (at 9.09 ft) on August 14. This peak discharge exceeded the 100-year RI and exceeded the maximum for 21 years of record by 171 f t3/s; the corresponding stage was exceeded by 0.63 ft. About 6 mi upstream from Highland Park, however, the peak discharge of Skokie River at Lake Forest (05535000) corresponded to an RI of just 3 years, an indication of the extreme variability in storm rainfall. Station data for North Branch Chicago River at Deerfield (05534500), Skokie River near Highland Park (05535070) , West Fork of North Branch Chicago River at Northbrook (05535500), and North Branch Chicago River at Niles (05536000) are listed in table 7.

Peak discharges of record also were recorded on tributaries to the Du Page River. Peak discharges on West Branch Du Page River near West Chicago (05539900) (958 ft3/s) and on Kress Creek at West Chicago (05540060) (573 ft3/s) correspond to 35-year RI's, but the floods of December 1982 and July 1964 were greater. Downstream, however, the peak discharges of West Branch Du Page River near Warrenville (05540095) on August 15 was a record 3,050 ft3/s (at 5.85 ft) which exceeded the 100-year RI for 19 years of record. At St. Joseph Creek at Lisle (05540200), the peak discharge of 1,230 ft3/s (at 8.10 ft) on August 14 nearly doubled the previous maximum for 18 years of record that had been recorded the

35

DIS

CH

AR

GE

, IN

CU

BIC

FE

ET

Pfc

H

SE

CO

ND

D

ISC

HA

RG

E,

IN C

UB

IC F

EE

T P

ER

SE

CO

ND

O OLU WDC UJ 0.

LU U.OffiD OzLU O DC< X Oen o

1 ,600

1,200

800 -

400

05530000 Weller Creek at Des Plaines (Map number 25 in figure 17 and table 6)

OzO O UJen DCLU 0.

LU LU LL

OCO=> O

LU O DC <I Oen o

2,000

1,500

1,000 -

05530990 Salt Creek at Rolling Meadows (Map number 26 in figure 17 and table 6)

500 ~

15 16 17

AUGUST 1987

Figure 18. Streamflow for selected streams in the Des Plaines River basin, August 1987 Continued.

37

DIS

CH

AR

GE

, IN

CU

BIC

F

EE

T

PE

R

SE

CO

ND

D

ISC

HA

RG

E,

IN C

UB

IC F

EE

T P

ER

S

EC

ON

D

CD

00

cr e

n&)

rt

w n

H-

fDD

&)

- 3

£

Oua

s

c en HJ

rt

o n

M &

en

00

fD-j i-

1

i o

n

rt0

fD rt H

- CO

3

ft

fD

fD

&

m H-

3 el

s'

fD O

fD

cn

oz o oLU en

CC UJ Q.

UJ UJ LL

g ffiDo

UJoDC<Xoeno

o z o oUJen ccUJQ.»-UJ UJu. o ffiD O

UJoDC< Xoeno

1,000

800

600

400

200

0

1,000

800

600

400

200

05534500 North Branch Chicago River at Deerfield (Map number 32 in figure 17 and table 6)

05535070 Skokie River near Highland Park (Map number 34 in figure 17 and table 6)

1 4 15 16 17

AUGUST 1987

1 8 1 9


39

cr OJ

cn H-

ITJ

H-

C

0> M

00 I I

DIS

CH

AR

GE

, IN

C

UB

IC

FE

ET

PE

R

SE

CO

ND

D

ISC

HA

RG

E,

IN C

UB

IC F

EE

T P

ER

SE

CO

ND

i-h

c o

c rt

O H{

M VD

cn00

0)

1 0)

i n

0

rtO

05

3

Q

i rt H

- cn

3

rt

0)

0>pi

ju

3 cn

> C

O c H m*L to 00

-

rt nr 0) o 0) cn

QZo o 111WDC 111 0.H III 111 U_OOD O

111 oDC

O <£Q

600

500

400

300

200

100

05540060 Kress Creek at West Chicago (Map number 42 in figure 17 and table 6)

13 14 15 16 17

AUGUST 1987

18 19


previous October. The Du Page River at Shorewood (05540500), the streamflow- gaging station farthest downstream, peaked at 3,650 ft3/s on August 17, a peak equivalent to less than a 2-year RI. Station data for Kress Creek at West Chicago (05540060) are listed in table 7.

In the Fox River basin, no new peak discharges of record were recorded. The peak discharges that were recorded as a result of the August 13-14 storms had RI's that were 7 years or less.

SUMMARY

The storms of October 2-3, 1986, and August 13-14, 1987, in Illinois, though of contrasting types, both caused record floods and stream discharges with recurrence intervals exceeding 100 years. The storms of October 2-3, 1986, were associated with a cold front that stalled over northern and central Illinois from September 28-October 4. The storms varied in intensity and duration over a large area. The size of the resulting floods was due to the combined rainfall from the October 2-3 storms and 2 weeks of nearly daily rainfall that preceded the storms. The storms of August 13-14, 1987, were convective storms of short duration and high intensity over a limited area in northeastern Illinois. Antecedent rainfall was not an important factor in the resulting floods.

41

Meteorological and hydrological analyses oJ: the storms are compiled in this report for the future reference of water-resource planners. The meteorological analyses include surface-weather maps showing the air mass and frontal conditions that produced the storms. The temporal and spatial distribution of the rainfallpreceding and during the flooding is describedcumulative daily and hourly rainfall. Hydro! ogic data and analyses include discharge hydrographs, streamflow data, frequency analyses of the peak discharges, and a comparison of peak stages and discharges for the floods to previous records.

The floods of September 26-October 4, 1986, included nine peak dischargesof record, of which four exceeded the 100-yearof August 14-17, 1987, produced 11 peak discharges of record, of which 10exceeded the 100-year flood recurrence intervalthroughout the Illinois River basin and were most severe in northeastern Illinois. The floods of 1987 were localized and confined to the Des Plaines River basin. For the 1986 flood, the 3-day rainfall recurrence intervals were much smaller than the flood recurrence intervals, but the 10-day rainfall recurrence intervals were in close agreement. For the 1987 flood, the rainfall and flood recurrence intervals were in close agreement.

by isohyetal maps and plots of

recurrence interval. The floods

The 1986 floods were scattered

REFERENCES

Curtis, G.W., 1987, Technique for estimating flood-peak discharges and frequencies on rural streams in Illinois: U.S. Geological Survey Water- Resources Investigations Report 87-4207, 79 p.

----- 1990, Storm and flood of August 13 to 15, 1987, in Cook and Du Page Counties, Illinois, in National Water Sunutnary 1987--hydrologic events and water supply and use: U.S. Geological Survey Water-Supply Paper 2350, p. 49-50. i

Dietrich, T.L., 1989, Floods along Des Plaines ind Fox Rivers: September-October 1986: National Oceanic and Atmospheric Administration Technical Memorandum NWS CR-95, 22 p.

Enstad, Robert, and Karwath, Rob, 1986, State 4dds 5 counties to flooding toll:Chicago, 111., Chicago Tribune, October 7

Federal Emergency Management Agency, 1986, Inte:ragency hazard mitigation reportfor Illinois--in response to the October FEMA-776-DR-IL, 20 p.

, 1986, section 2, p. 1.

7, 1986, disaster declaration:

----- 1987, Interagency hazard mitigation reporlp for Illinois--in response to theAugust 21, 1987, disaster declaration: FE^tA-778-DR-IL, 44 p.

t

Graff, Peggy, 1986, Collapsed levees caujse extensive farmland damage: Bloomington, 111., The Pantagraph, October 5, 1986, p. A3.

42

Huff, F.A., and Angel, J.R., 1989, Frequency distributions and hydroclimatic characteristics of heavy rainstorms in Illinois: Illinois State Water Survey Bulletin 70, 177 p.

Interagency Advisory Committee on Water Data, Hydrology Subcommittee, 1982, Bulletin 17B, Guidelines for determining flood flow frequency: Reston, Va. , U.S. Geological Survey, Office of Water Data Coordination, 183 p.

Ishii, A.L., 1991, Floods of June 13-14, 1981, and December 2-12, 1982, in Illinois: U.S. Geological Survey Water-Resources Investigations Report 91-4062, 109 p.

Merzlock, Paul, 1989, The record rainfall of August 13-14, 1987, at Chicago, Illinois: National Oceanic and Atmospheric Administration Technical Memorandum NWS CR-98, 53 p.

National Oceanic and Atmospheric Administration, 1986a, Climatological data, Illinois, September 1986: Asheville, N.C., National Climatic Data Center, v. 91, no. 9.

----- 1986b, Climatological data, Illinois, October 1986: Asheville, N.C., National Climatic Data Center, v. 91, no. 10.

----- 1986c, Climatological data, Indiana, September 1986: Asheville, N.C., National Climatic Data Center, v. 91, no. 9.

----- 1986d, Climatological data, Indiana, October 1986: Asheville, N.C., National Climatic Data Center, v. 91, no. 10.

----- 1986e, Climatological data, Iowa, September 1986: Asheville, N.C., National Climatic Data Center, v. 97, no. 9.

----- 1986f, Climatological data, Iowa, October 1986: Asheville, N.C., National Climatic Data Center, v. 97, no. 10.

----- 1986g, Climatological data, Kentucky, September 1986: Asheville, N.C., National Climatic Data Center, v. 81, no. 9.

----- 1986h, Climatological data, Kentucky, October 1986: Asheville, N.C., National Climatic Data Center, v. 81, no. 10.

----- 1986i, Climatological data, Missouri, September 1986: Asheville, N.C., National Climatic Data Center, v. 90, no. 9.

----- 1986J, Climatological data, Missouri, October 1986: Asheville, N.C., National Climatic Data Center, v. 90, no. 10.

----- 1986k, Climatological data, Wisconsin, September 1986: Asheville, N.C., National Climatic Data Center, v. 91, no. 9.

----- 19861, Climatological data, Wisconsin, October 1986: Asheville, N.C., National Climatic Data Center, v. 91, no. 10.

43

1986m, Hourly precipitation data, Illinois, September 1986: Asheville, N.C., National Climatic Data Center, v. 36, no. 9.

----- 1986n, Hourly precipitation data, Illinois National Climatic Data Center, v. 36, no.

----- 1987a, Storm data: Asheville, N.C., National Climatic Data Center, v. 29, no. 8, 62 p.

- 1987b, Climatological data, Illinois, National Climatic Data Center, v. 92, no.

, October 1986: Asheville, N.C., 10.

August 1987: Asheville, N.C.,

----- 1987c, Climatological data, Indiana, Auguslt 1987: Asheville, N.C., National Climatic Data Center, v. 92, no. 8. |

----- 1987d, Climatological data, Iowa, August|1987: Asheville, N.C., National Climatic Data Center, v. 98, no. 8.

----- 1987e, Climatological data, Kentucky, August 1987: Asheville, N.C., National Climatic Data Center, v. 82, no. 8.

----- 1987f, Climatological data, Missouri, August 1987: Asheville, N.C., National Climatic Data Center, v. 91, no. 8.

----- 1987g, Climatological data, Wisconsin, August 1987: Asheville, N.C., National Climatic Data Center, v. 92, no. 8.

National Weather Service, 1986a, Daily weather maps--weekly series, September 15-21, 1986: Washington D.C., Climate Analysis Center.

----- 1986b, Daily weather maps weekly series, September 22-28, 1986: Washington D.C., Climate Analysis Center.

----- 1986c, Daily weather maps--weekly series, September 29-October 5, 1986: Washington D.C., Climate Analysis Center.

44

TABLES 1-7

National Weather Service stations instorms of September 25-Octo

[<, less than; rainfall data from the Atmospheric Administration (1

Map Station number1 name

55

596186

107110128146158

59

32 33

34 82

9095 97

170 173

858 89

105139

Freeport wastewater plant

GalvaGeneseoKewanee 1 EMorrisonMount CarrollPaw Paw 1 ERockford WSO APStockton 1 N

Antioch 2 NWBarrington Chicago O'Hare Chicago University

Chicago Midway Joliet BrandonRoad Dam

Lake Villa 2 NEMarengo Marseilles LockWaukegan Wheaton 3 SE

Avon 5 NEGalesburg La Harpe MonmouthQuincy FAA AP

Time of daily reading2 (hour")

0700

07002400080007000800060024000800

07000800 2400 1200

2400 0700

24000700 07000600 0700

07000700 0700 18002400

September October 4.

Total Re rainfall i (inches) (

NORTHWEST

7.48

5.52

Illinois during the

ber 4. 1986

National Oceanic and 986a, 1986b)]

25- 1986 October:urrence Total nterval3 rainfall rears) (inches)

12

34.56 <24.66 <24.25 <23.81 <23.88 <23.63 <25.64 3

NORTHEAST

8.34 256.13 4.93 5.47

5.70 4.76

5 <2 3

4 <2

3.947.87 7.36

10.30 7.45

WEST

10.127.02 8.90 5.034.87

<215 1565 15

855

20 <2<2

1.20

1.931.372.021.13.87

1.48.34.89

0.421.25 2.07 1.64

1.86 2.67

.23

.75 4.08.70

1.85

7.582.20 4.98 2.453.54

2-4. 1986Recurrence interval3 (years)

<2

<2<2<2<2<2<2<2<2

<2<2 <2 <2

<2 <2

<2<2 3

<2 <2

35<2 4

<2<2

46

Table 1.--Total rainfall and recurrence intervals at selectedNational Weather Service stations in Illinois during the

storms of September 25-October 4. 1986--Continued

Map number1

Station name

Time of daily

reading2 (hour)

September 25- October 4. 1986

Total rainfall (inches)

Recurrence interval3 (vears)

OctoberTotal rainfall (inches)

2-4. 1986Recurrence interval3 (vears)

CENTRAL

29537492

103119131138

136

70157

ChenoaFarmer City 2 WHavana 4 NNELincolnMinonkNormalPeoria WSO APPrinceville

Pontiac

GriggsvilleSpringfieldWSO AP

18000700070007000800160024001800

0700

07002400

7.792.967.083.347.616.034.497.43

EAST

6.79

WEST SOUTHWEST

6.043.25

20<210<2154

<215

8

3<2

5.69.50

3.701.083.273.802.684.11

3.36

2.291.06

15<22

<2<22

<23

<2

<2<2

1 Map number refers to figure 1.2 Central standard time.3 Determined according to the techniques of Huff and Angel (1989).

47

Tabl

e 2.

--Su

mmar

y of

pe

ak s

tage

s an

d di

scha

rges

for

the

floo

ds o

f late S

eptember

and

early O

ctober 19

86

oo

Map

numb

er 1 2 3 4 5 6 7

Stat

ion

number

0334

4500

03378635

0541

4820

0541

9000

0542

0500

0543

5500

0543

7500

[mi

, square

Stat

ion

name

Rang

e Creek

near

Cas

ey,

Little W

abas

h Ri

ver

near

Ef

fing

ham,

III.

Sins

inaw

a Ri

ver

near

Menominee, III.

at se

lect

ed

miles; WY,

wate

r <, less than;

>(

Drainage

area

(mr)

streamf lo

w-ga

ging

sta

tion

s in

Illinois

year;

ft,

feet

; ft

/s, cubic

feet p

er s

econ

d;

, gr

eate

r than;

>, greater

than

or

equa

l to]

Prev

ious

ly r

ecor

ded

Peri

od

maximum

flood

of

Type

Ga

ge

record

of

heig

ht

Disc

harg

e (WY)

reco

rd1

Date

(ft)

(ffVs)

OHIO

RIVER B

ASIN

Waba

sh R

iver

basin

III.

7.61

1951

-82,

D

08-1

1-61

12.50

3,50

0 19

83-

C 240

1967

- D

04-20-70

19.9

5 10,300

UPPE

R MI

SSIS

SIPP

I RI

VER

BASI

N ABOVE

THE

ILLI

NOIS

RI

VER

Sins

inaw

a Ri

ver

basi

n

39.6

1968

- D

06-29-69

13.3

4 11,600

Appl

e River

near

Han

over

, II

I.

247

Miss

issi

ppi

River

at

85,6

00

Clin

ton,

Iowa

Peca

toni

ca R

iver

at

1,32

6 Freeport,

III.

Rock R

iver a

t Ro

ckto

n, II

I.

6,363

Apple

Rive

r basin

1935-

D 01-05-46

25.37

12,0

00

Mississippi

River

main

ste

m

1873-

D 04

-28-

65

--

307,00

0

Rock

River b

asin

1914

- D

03-16-29 2

19.76

18,4

00

1903-09,

D 03-30-16 2

13.0

6 32

,500

19

14-1

9,

D 1940-

D

--,

no d

ata;

Maxi

mum

flood

of

September/October

1986

Gage

Recurrence

height

Disc

harg

e in

terv

al

Date

(ft)

(f

tvs)

(y

ears

)

10-01

9.07

75

4 <2

10-04

14.6

6 3,060

<2

09-2

9 11

.42

6,660

7

09-2

9 16

.50

4,860

<2

10-06

--

201,

000

10

09-2

6 12

.61

3,550

<2

10-0

5 10

.82

17,4

00

3

Tabl

e 2.--Summary

of pe

ak st

ages

an

d discharges for

the

floods of

late S

epte

mber

and

early

Octo

ber

1986

at se

lect

ed streamf lo

w-ga

ging

stations in Il

lino

is Con

tinu

ed

Previously recorded

Maximum

floo

d of

Period

maxi

mum

floo

d September/October

1986

Map

number 8 9 10

11 12

13 14

15

Drainage

of

Type

Gage

Ga

ge

Recurrence

Stat

ion

area

re

cord

of

he

ight

Discharge

height

Discharge

inte

rval

number

Stat

ion

name

(mi'

1)

(WY)

reco

rd1

Date

(ft)

(f

t /s)

Date

(ft)

(ftV

s)

(years)

UPPE

R MI

SSIS

SIPP

I

0543

7695

Ke

ith

Cree

k at

Eighth Street

13.4

at Ro

ckfo

rd,

III.

05438500

Kishwaukee R

iver

at

538

Belv

ider

e, III.

05440000

Kishwaukee R

iver

near

1,099

Perr

yvil

le,

III.

05446500

Rock

Riv

er ne

ar Joslin,

III.

9,549

05466000

Edwards

Rive

r ne

ar O

rion

, III.

155

05466500

Edwa

rds

Rive

r ne

ar

445

New

Boston,

III.

05469000

Hend

erso

n Cr

eek

near

432

Oqua

wka,

III.

05474500

Miss

issi

ppi

Rive

r at

119,000

Keokuk,

Iowa

RIVE

R BASIN

ABOV

E THE

ILLI

NOIS

RI

VER --Continued

Rock

River

basi

n- -Continued

1980-86,

D 09

-01-

81

10.48

1,60

0 09

-25

9.81

1,240

1987-

07

1940-

D 03

-16-

43

13.10

10,3

00

09-26

9.32

4,

570

1940-

D 03-21-79

20.4

8 16,7

00

09-2

6 11

.62

5,51

0

1940-

D 03

-22-

48

14.4

6 46,200

10-03

13.61

23,400

Edwards

Rive

r basin

1941-

D 02

-19-

51

13.41

8,91

0 10-03

12.0

0 2,

810

1935-

D 04-22-73

23.3

3 18

,000

10

-05

19.01

2,09

0

Henderson

Cree

k basin

1935-

D 07

-08-

82

31.0

5 34,600

10-04

26.73

7,25

0

Mississippi

River

main stem

1878-

D 04-24-73

--

344,00

0 10

-06

--

268,

000

Bear Cr

eek

basin

5 3 <2 2 <2

<2 4 20

16

05495500

Bear

Cr

eek

near

Marc

el lin

e, III.

349

1944

- D

03-04-85

28.3

8 29

,500

10-03

24.10

20,700

15

Tabl

e 2.

--Su

mmar

y of peak stages an

d discharges for

the

floo

ds of

late September

and

earl

y Oc

tobe

r 19

86

Ul o

at selected st

ream

f lo

w-ga

ging

st

atio

ns in Illinois-

- Con

t i nue

d

Map

Station

number

numb

er

Drainage

area

Station

name

(m

i )

Period

of

reco

rd

(WY)

Prev

ious

ly

maximum

Type °f

1 re

cord

Date

Gage

height

(ft)

recorded

floo

d

Discharge

(fr/s)

Date

Maximum

flood

of

Sept

embe

r/Oc

tobe

r 19

86Gage

heig

ht

(ft)

Recu

rren

ce

Disc

harg

e in

terv

al

(ffVs)

(yea

rs)

UPPE

R MI

SSIS

SIPP

I RI

VER

BASI

N AB

OVE

THE

ILLI

NOIS

RI

VER --

Contin

ued

Hadley C

reek

17

05502020

18

0551

3000

Hadl

ey C

reek

ne

ar B

arry,

III.

40.9

Bay

Cree

k at Nebo,

III.

161

1956

-66,

1967

- Bay

1940

-86

D C

basin

04-21-73

04-11-79

15.3

112

.89

9, 9,00

0000

10-0

39.

043,230

<2

Cree

k ba

sin

D

ILLINOIS RIVER

Kankakee Ri

ver

19

0552

0500

Kank

akee

Ri

ver

at Momence, III.

2,29

41905-06,

1915

-D D

08-16-46

BASI

N

basi

n

03-0

6-79

19.31

310.51

23,

16,

500

000

09-2

4

10-0

4

9.46

4.26

4,180

5,78

0

<2 <2

Des

Plai

nes

Rive

r basin

20

05527800

21

0552

8000

22

05528500

23

05529000

24

0552

9500

25

05530000

26

0553

0990

27

0553

1500

Des

Plaines

Rive

r at

123

Russell, III.

Des

Plai

nes

Rive

r ne

ar

232

Gurn

ee,

III.

Buff

alo

Cree

k ne

ar

19.6

Whee

ling

, III.

Des

Plaines

Rive

r ne

ar

360

Des

Plai

nes,

III.

McDonald C

reek

ne

ar

7.93

Moun

t Prospect,

III.

Well

er C

reek

at

13.2

Des

Plai

nes,

III.

Salt

Cr

eek

at

30.5

Roll

ing

Meadows, III.

Salt

Cr

eek

at Western

115

1961-63,

1962

-67,

1967-

1946

-58,

1960

-68,

1969-

1952-

1941

-

1952

-

1951-

1974

-

1946-

L FP D D C D D D D D D D

03-21-79

04-0

3-60

07-2

2-82

04-02-60

06-20-72

06-1

0-67

12-0

3-82

12-05-82

9.69

10.64

7.94

8.56

7.58

15.0

9

12.5

6

8.71

2, 3, 4, 1, 1, 2,

120

070

887

670

664

590

060

070

09-2

7

09-2

7

09-22

10-01

09-2

9

09-2

9

09-23

10-03

10.75

*11.95

6.81

*10.88

5.62

5.85

7.73

8.03

1,640

*3,530 581

*4,900 163

629

461

1,720

9

>100 7 50 <2 <2 <2 10

Springs, III.

Table

2.--Summary

of pe

ak s

tage

s and

disc

harg

es for

the

floods o

f late S

epte

mber

and

early O

ctob

er 1

986

at selected s

trea

mf low

-gag

ing

stations in I

lli

nois

--Co

ntinued

Map

numb

erSt

ation

number

Drainage

area

Stat

ion

name

(m

i )

Peri

od

of

Type

re

cord

of

« (WY)

reco

rd1

Prev

ious

ly r

ecor

ded

maximum

flood

Date

Gage

height

(ft)

Discha

rge

(ftVs)

Maximum

floo

d of

Se

ptem

ber/

Octo

ber

1986

Date

Gage

heig

ht

(ft)

Disc

harg

e (ftVs)

Recu

rren

ce

interval

(yea

rs)

ILLINOIS R

IVER B

ASIN- -Continued

28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

0553

2000

0553

2500

0553

3000

0553

3400

0553

4500

0553

5000

0553

5070

0553

5500

0553

6000

0553

6215

0553

6235

0553

6255

0553

6275

0553

6500

0554

0060

0554

0095

0554

0200

0554

0500

Add is

on C

reek a

t Be

1 1 woo

d, II

I.Des

Plai

nes

River

atRi

vers

ide,

II

I.Fl

ag C

reek

nea

r Willow

Springs, III.

Sawmill

Creek

near L

emont, II

I.

North

Branch C

hica

go R

iver

at D

eerf

ield

, III.

Skokie R

iver a

t La

keForest,

III.

Skokie R

iver n

ear

High

land

Park,

III.

West

Fo

rk o

f North

Bran

ch Ch

icag

oRi

ver

at N

orthbrook, II

I.North

Bran

ch C

hica

go R

iver

at N

iles

, II

I.Th

orn

Cree

k at

Glenwood

, II

I.Deer C

reek

nea

r Ch

icag

oHe

ight

s, III.

Butterfield

Creek

atFlossmoor, II

I.Thorn

Creek

at T

hornto

n, II

I.Tinley C

reek

near

Palo

sPark,

III.

Kress

Cree

k at W

est

Chicago, II

I.

West Branch D

u Pa

ge R

iver

near

War

renv

ille

, II

I.St.

Jose

ph Creek

at Li

sle, II

I.

Du P

age

River

at Sh

orewood, II

I.

Des

17.9

630 16.5

13.0

19.7

13.0

21.1

11.5

100 24.7

23.1

23.5

104 11.2

18.1

90.4

11.8

324

Plaines

Rive

r basin- - Cont i n

ued

1951-

1944

-

1951-

1961-79,

1986

-1952-

1952-

1967-

1952-

1951-

1949-

1948-

1948-

1948-

1951-

1961-80,

1986-

1969-

1961-76,

1986-

1941

- Mazon

D D D C D D D D D D D D D D D C D D FP D D Rive

r

08-0

7-82

03-20-48

09-1

4-61

05-1

2-66

04-18-75

07-2

2-82

07-2

2-82

12-0

3-82

07-2

2-82

06-1

1-67

08-1

7-68

07-1

3-57

05-2

2-82

07-1

3-57

10-10-54

07-1

8-64

12-0

3-82

12-30-72

10-1

1-54

basi

n

10.6

88.

28

13.7

1

12.9

412

.94

10.9

3

8.35

8.46

9.66

9.83

11.26

11.75

11.97

16.0

010

.30

7.90

4.88

10.6

3

11.06

839

6,510

2,68

0

984

984

756

435

724

1,07

0

2,21

0

2,60

01,380

2,16

0

4,700

1,930

637

2,16

0 --

12,000

10-03

10-03

10-03

09-26

09-3

0

09-26

09-3

0

09-25

09-29

10-03

10-03

10-03

10-03

10-03

10-03

10-03

10-03

10-03

8.90

*8.87

7.29

12.52

10.51

8.27

8.17

7.73

9.47

9.26

10.14

8.56

10.0

15.

49

5.46

3.22

5.81

4.59

580

*7,5

90 694

494

465

*492 584

630

1,800

831

409

522

1,100

330

145

708

*649

2,01

0

5 70 <2 <2 7

>100 9 4 20 <2 <2 <2 <2 <2 <2 <2 9 <2

46

0554

2000

Mazon

River

near

Coa

l Ci

ty,

III.

455

10-04

12.34

9,310

Tabl

e 2.--Summary

of p

eak

stag

es a

nd d

ischarges

for

the

floods o

f late S

epte

mber

and

early October 1986

at se

lect

ed s

trea

mf low-gaging

stations in Il

lino

is-

- Con

t i nue

d

Map

numb

erSt

ation

number

Stat

ion

name

Drainage

area

(mr)

Peri

od

of

Type

re

cord

of

(WY)

record'

Previously r

ecor

ded

maxi

mum

flood

Date

Gage

he

ight

(ft)

Disc

harg

e (frV

s)Date

Maxi

mum

floo

d of

September/October

1986

Gage

heig

ht

(ft)

Discharge

(frvs)

Recu

rren

ce

interval

(yea

rs)

ILLI

NOIS

RIVER B

ASIN- -C

onti

nued

Fox

Rive

r ba

sin

47 48 49 50 51

Ul to52 53 54 55 56 57 58 59

0554

6500

0554

8280

0554

9000

0555

0000

0555

2500

0555

4000

0555

4500

0555

5300

0556

3000

0556

3500

0556

7000

0556

7500

0556

8000

Fox

River

at W

ilmot, Wis.

Nipp

ers ink

Cree

k ne

arSpring G

rove

, II

I.Boone

Creek

near

McH

enry,

III.

Fox

River

at A

lgonquin,

III.

Fox

River

at D

ayton, III.

North

Fork V

ermilion R

iver

near C

harlotte,

III.

Verm

ilio

n Ri

ver

atPo

ntia

c, III.

Verm

ilio

n River

near

Leon

ore,

III.

Kick

apoo

Cre

ek n

ear

Kickapoo,

III.

Kick

apoo

Creek a

t Pe

oria

, II

I.

Pant

her

Creek

near

El Pa

so,

III.

Mack

inaw

River n

ear

Congerville, III.

Mack

inaw

River n

ear

Green

Val le

y, II

I.

868

192 15.5

1,403

2,642

186

579

1,25

1

119

297 93.9

767

1,089

1940-

D1966-

D

1948-82,

D19

83-

C1916-

D

1915

- D

Verm

ilio

n Ri

ver

1943

-62,

D

1963

- C

1943

- D

1931

- D

Kick

apoo

Cre

ek

1945

-62,

D

1963

- C

1942

-71,

D

1972-

C

Mack

inaw

Riv

er

1950

-60,

D

1961-

C19

45-

D

1921

-56,

D

1957

- C

03-3

1-60

02-20-71

06-0

2-70

04-0

6-60

04-0

2-79

10-11-54

basin

05-1

4-70

12-04-82

07-15-58

basin

07-2

7-67

06-2

2-74

basin

07-09-51

12-04-82

12-06-82

9.25

13.0

3

4.87

4.01

4.00

24.6

3

16.13

19.16

15.3

0

17.0

8

29.68

15.1

5

20.2

1

16.13

7,52

02,

430

276

6,610

6,610

47,1

00

4,550

13,100

233,50

0

27,5

00

48,500

10,9

00

44,800

51,1

00

10-02

09-26

09-27

10-03

10-04

10-03

10-04

10-0

5

10-03

10-03

10-03

10-04

10-04

7.96

*14.

26

*5.37

3.99

12.2

8

*17.09

15.6

9

22.2

3

*18.

85

21.76

12.45

19.61

14.01

3,810

*2,910

*345

6,170

10,700

*4,9

00

8,330

21,400

*4>3

0,00

0

19,700

6,340

35,300

23,400

5 35 60 25 <2 20 5 7

e>50 15 15 50 15

Table

2.--Summary

of peak stages an

d discharges for

the

floo

ds of late S

eptember a

nd e

arly

Oct

ober

19

86at

selected s

trea

mf low

-gag

ing

stations in

Il

lino

is- -Continued

Map

number

Stat

ion

number

Stat

ion

name

Drai

nage

ar

ea

(mr)

Period

of

Type

record

of

(WY)

reco

rd1

Prev

ious

ly r

ecor

ded

maximum

floo

d

Date

Gage

height

(ft)

Disc

harg

e (ftVs)

Date

Maximum

flood

of

Sept

embe

r/Oc

tobe

r 19

86Ga

ge

height

(ft)

Disc

harg

e (ftVs)

Recurrence

interval

(yea

rs)

ILLINOIS RI

VER

BASI

N- -Continued

Illinois R

iver

main

stem

60 61 62 63 64 65 66 67

05568500

05568800

05569500

05570000

05570360

05570370

05570380

05570500

1 1 lin

ois

River

at

Kingston M

ines

, II

I.

Indi

an C

reek

nea

r Wyom

ing,

II

I.Sp

oon

Rive

r at London

Mill

s, III.

Spoon

Rive

r at

Seville, III.

Evelyn B

ranc

h ne

ar Bryant,

III.

Big

Cree

k ne

ar B

ryant, III.

Slug

Run

near

Br

yant

, III.

Illi

nois

River

at Havana,

III.

15,818 62

.71,072

1,63

6 5.78

41.2 7.12

18,299

1940- Sp

oon

1960-

1943

-

1914

-19

72-

1972

-19

75-

Illi

nois

1922-27,

1985

-

D12-07-82

--88,800

10-07

--55,200

4

River

basin

D D D D D D

06-2

2-74

06-2

3-74

08-2

2-24

06-05-86

06-23-74

06-05-86

13.8

128.03

30.77

3.69

12.9

08.

91

, 6,

540

^41,

000

37,300 325

1,22

068

5

10-03

10-04

10-0

510-03

10-03

10-03

10.2

024

.36

27.2

93.55

12.3

36.

19

1,36

026,400

21,400 276

899

151

<2 30 7>1

00 3 2

Rive

r main s

tem

D D

Sangamon R

iver

68 69 70 71 72 73 74

05575500

05579500

05580000

05580500

05580950

0558

1500

0558

2000

Sout

h Fo

rk S

anga

mon

Rive

rat

Ki

ncai

d, III.

Lake

Fo

rk n

ear

Cornland

, II

I.Kickapoo C

reek

at

Waynesville, III.

Kickapoo C

reek

nea

rLincoln, III.

Suga

r Cr

eek

near

Bloo

ming

ton,

III.

Suga

r Cr

eek

near

Hartsburg, III.

Salt

Cr

eek

near

Greenview, III.

562

214

227

306 34.4

333

1,80

4

1917-34,

1945

-61,

1962-

1948

-19

48-

1945-71,

1972

-19

75-

1945

-71,

1972-

1942-

D D C D D D C D D C D

03-0

9-85

basin

06-29-57

04-12-79

08-1

5-81

12-06-82

12-03-82

12-0

4-82

05-1

9-43

26.30

30.02

23.1

116

.91

16.6

0

14.02

17.9

0

20.50

90,300

21,500

8,930

24,600

23,300

6,600

41,200

41,200

10-09

10-0

4

10-0

510-04

10-0

3

10-03

10-0

3

10-0

5

15.35

10.2

412.12

11.1

9

11.2

9

14.61

unkn

own

55,000

1,67

0

678

2,510

2,780

3,89

0

14,200

6,40

0

3 <2 <2 <2 <2 4 8 <2

Tabl

e 2.

--Su

mmar

y of

peak stages an

d discharges for

the

floods of

late September

and

early October

1986

at se

lect

ed st

ream

f low-gaging st

atio

ns in

I lli

nois

Con

tinu

ed

Map

Stat

ion

number

number

Station

name

75

05583000

Sang

amon

Riv

er ne

ar

Oakf

ord,

III.

76

05584400

Drowning Fo

rk a

t Bu

shne

ll,

77

05584500

La M

oine R

iver

at

Colmar,

78

05585000

La M

oine

Riv

er a

t Ripley,

79

0558

5500

Il

lino

is R

iver

at

Me

redo

sia,

III.

80

05587450

Mississippi

Rive

r at

Gr

afto

n, III.

81

05587900

Caho

kia

Cree

k at

Edwardsville,

III.

82

0558

8000

In

dian

Cr

eek

at Wa

nda,

III

Prev

ious

ly r

ecorded

Period

maxi

mum

floo

dDr

aina

ge

of

Type

Ga

ge

area

re

cord

of

he

ight

Discharge

(mi

) (W

Y)

reco

rd1

Date

(ft)

(ftV

s)

ILLINOIS R

IVER

BA

SIN-

-Continued

Sangamon R

iver

basin Continued

5,09

3 1910-12,

D 05

-20-

43

25.6

3 123,000

1914-19,

D 1921-22,

D 1929-34,

D 19

40-

D

La M

oine R

iver b

asin

III.

26.3

1960-82,

D 06

-02-

80

12.92

3,50

0 19

83-

C III.

655

1945

- D

03-0

5-85

26.61

38,900

III.

1,293

1921

- D

03-0

7-85

29.07

28,0

00

Illinois Ri

ver

main stem

26,028

1939-

D 05-26-43

--

123,000

UPPE

R MI

SSIS

SIPP

I RI

VER

BASIN

BELOW

THE

ILLINOIS RIVER

Miss

issi

ppi

Rive

r main stem

171,

300

1928

- D

04-2

9-73

--

53

5,00

0

Caho

kia

Cree

k basin

212

1969

- D

04-1

2-79

24

.74

8,20

0

36.7

1940

- D

08-15-46

18.41

29,3

40

Maximum

floo

d of

Se

ptem

ber/

Octo

ber

1986

Gage

Recurrence

heig

ht

Disc

harg

e in

terv

al

Date

(ft)

(ft Vs)

(vea

rs)

10-05

16.0

4 18

,000

<2

10-0

3 14

.07

--

e>10

0

10-0

4 25

.69

28,700

30

10-07

28.1

0 23,400

35

10-1

1 --

69,900

3

10-1

0 --

42

3,00

0 <2

10-04

17.8

5 4,380

<2

09-3

0 11

.25

1,300

<2

Tabl

e 2.

--Su

mmar

y of

pe

ak stages an

d di

scha

rges

for

the

floo

ds of

la

te September

and

early

Octo

ber

1986

at selected st

ream

f lo

w-ga

ging

st

atio

ns in Il

lino

is-

- Con

t i nued

Map

number

83

84 85 86

87

5 88 89 90

Stat

ion

number

0559

2050

05592500

05592800

05593600

05593900

0559

4000

0559

4800

05595200

Stat

ion

name

UPPER

Robi

nson

Cre

ek n

ear

Shel

byvi

lle,

III.

Kaskaskia

Rive

r at

Va

ndal

ia, III.

Hurr

ican

e Cr

eek

near

Mulberry G

rove

, III.

Blue

Gr

ass

Cree

k ne

ar

Raymond, III.

East

Fo

rk S

hoal

Cr

eek

near

Coffeen, III.

Shoal

Cree

k ne

ar Br

eese

, III

Silver Cr

eek

near

Freeburg,

Rich

lan

d Cr

eek

near

Hecker,

D ra i nage

area

(mr>

Period

of

Type

re

cord

of

(WY)

record'

Previously recorded

maximum

floo

d

Date

Gage

height

(ft)

Disc

harg

e (ffVs)

Maxi

mum

floo

d of

Sept

embe

r/Oc

tobe

r 19

86

Date

Gage

he

ight

(ft)

Discharge

(ffVs)

Recu

rren

ce

interval

(yea

rs)

MISS

ISSI

PPI

RIVE

R BA

SIN

BELO

W THE

ILLINOIS RIVER --

Cont

inue

d

93.1

1,94

0

152 17.3

55.5

735

III.

464

III.

129

Kaskaskia

Rive

r

1980-

D

1908-12

D

1971-

D

1960-82,

D 19

83-

C 19

64-

D

1910-15,

D 19

46-

D1971-

D 19

70-

D

basin

05-02-83

06-2

9-57

12-2

5-82

04-2

1-73

12-07-66

01-06-50

04-1

4-79

11

-02-

72

13.37

27.39

19.9

9

12.8

0

14.45

22.63

20.70

42.88

11,3

00

62,700

17,9

00

2,14

0

5,910

23,100

9,200

14,9

00

10-0

4

10-04

10-0

5

10-03

10-04

10-07

10-07

10-0

3

9.61

16.78

16.2

3

11.4

4

11.90

15.71

11.2

4 39.16

1,66

0

6,32

0

4,42

0

886

1,92

0

3,24

0

1,69

0 3,110

<2

<2 <2 <2

<2

<2 <2

<2

New

peak

of re

cord

established

during th

is flood.

D, co

ntinuous d

ischarge r

ecord; C,

pe

ak-s

tage

and p

eak-

disc

harg

e re

cord

only; D7

, co

ntin

uous

dis

char

ge re

cord

for

only

7 months

of th

e water

year

; L, low

flow

onl

y; FP

, fl

ood

prof

ile-

-pea

k-st

age

reco

rd only.

Site

an

d da

tum

then

in u

se.

3 Ice

affected.

The

esti

mate

erf >

30,0

00 f

t /s

for station 05563000 is

bas

ed o

n di

scha

rges

for t

he 2

5-,

50-, an

d 100-year r

ecur

renc

e in

terv

als

that ar

e 23

,500

, 28

,500

, an

d 33,900 ffVs,

resp

ecti

vely

(Cu

rtis

, 1987,

p. 51)

e Estimated.

Table 3.-- Data for selected streamflow-jfloods of late September and ear

[c.d.t., central daylight time; ft, feet; ft

HourDate (c.d.t.)

Sept. 24 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Sept. 25 0100020003000400050006000700080009001000110012001300140015001600

Gage height(ft)

paging stations for the:.v October 1986

: '/s , cubic feet per second]

Discharge Hour(ft3 /s) Date

05528000 Des Plaines River r

4.734.784.834.874.934.975.025.075.125.175.215.265.305.345.375.415.445.475.515.545.575.625.786.03

6.857.948.618.908.968.938.898.858.828.828.848.858.898.948.999.04

543 Sept.553 Contii

i (c.d.t.)

Tear Gurnee

25-- 1700med 1800

563 1900572 2000584 2100592 2200603 2300614625636 Sept.645

2400

26 01000200

657 0300666 0400675 0500682 0600691 0700698 0800705 0900714 1000722 1100729 1200741 1300781 1400846 1500

16001,080 17001,480 18001,760 19001,8901,9101,9001,8801,8601,8501,850 Sept.1,8601,8601,8801,9001,9301,950

20002100220023002400

27 0100020003000400050006000700

Gage height(ft)

9.119.189.249.309.369.409.459.49

9.539.569.599.639.679.699.719.749.779.809.829.849.88

10.0410.4010.8711.5111.6811.6811.6411.6111.5911.6011.62

11.6411.6811.7011.74

C 1 )C 1 )C 1 )

Discharge(ft3 /s)

1,9802,0202,0402,0702,1002,1202,1402,160

2,1802,2002,2102,2302,2502,2602,2702,2902,3002,3202,3302,3402,3602,4402,6302,8903,2603,3703,3703,3403,3203,3103,3203,330

3,3403,3703,3803,4003,4203,4303,440

56

Table 3.--Data for selected streamflow-gaging stations for thefloods of late September and early October 1986- -Continued

DateHour

(c.d.t.)

Gage height (ft)

05528000 Des

Sept. 27-Continued

Sept. 28

- 08000900100011001200130014001500160017001800190020002100220023002400

010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )( : )C 1 )

C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )

11.7611.7411.7211.7111.6911.6711.6511.6311.6111.5911.5711.5911.6511.6911.7311.74

Discharge (ft3 /s)

Plaines River

3,4503,4603,4703,4803,5003,5103,5103,5303,5303,5303,5303,5303,5303,5303,5203,5103,510

3,5003,4803,4803,4603,4603,4503,4403,4303,4103,4003,3903,3803,3703,3603,3503,3403,3203,3103,3003,3103,3503,3703,4003,400

Hour Date (c.d.t.)

Gage height (ft)

Discharge (ft3 /s)

near Gurnee- -Continued

Sept. 29 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Sept. 30 01000200030004000500060007000800090010001100120013001400150016001700

11.7411.7411.7311.7211.7111.7011.7111.7111.7111.7111.7411.76

C 1 )t 1 )C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )t 1 )C 1 )C 1 )C 1 )

C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )

C 1 )C 1 )( 1 )C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )C 1 )

3,4003,4003,4003,3903,3803,3803,3803,3803,3803,3803,4003,4103,4203,4303,4303,4403,4503,4503,4603,4603,4603,4703,4803,480

3,4903,5003,5003,5003,5003,4903,4903,4803,4803,4803,4803,4703,4703,4603,4603,4603,450

57

Table 3.--Data for selected streamflow-gaging stations for, thefloods of late September and early Oc

Hour Date (c.d.t.)

Gage height (ft)

05528000 Des

Sept. 30--Continued

Oct. 1

Oct. 2

1800190020002100220023002400

010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

0100020003000400050006000700080009001000

C 1 )C 1 )C 1 )C 1 )

11.7711.7711.76

11.7411.7111.7011.6711.6411.6211.6011.5811.5611.5411.5211.5111.4911.4711.4511.4211.4111.3811.3611.3611.3211.3011.2911.27

11.2411.2311.2111.1811.1711.1511.1311.1111.0911.07

ibober 1986 --Continued

Discharge Hour (ftVs) Date (c.d.t.)

Plaines Rivep near

3,450 Oct.3,440 Conti3,4303,4303,4203,4203,410

3,4003,3803,380

Gage height (ft)

Discharge (ftVs)

Clurnee - - Continued

2-- 1100.nued 1200

130014001500160017001800190020002100

3,360 22003,340 23003,330 24003,3203,300 Oct. 3 01003,290 02003,280 03003,270 04003,260 05003,2503,2403,2303,2103,200

06000700080009001000

3,190 11003,170 12003,170 13003,150 14003,1403,1303,120

3,100

15001600170018001900

3,100 20003,0803,0703,0603,0503,0403,030 Oct.3,0203,000

2100220023002400

4 010002000300

11.0511.0311.0110.9910.9710.9510.9310.9110.8910.8710.8510.8310.8110.79

10.7810.7510.7310.7110.6910.6710.6510.6310.6010.5110.5610.5510.5310.5110.4910.4610.4410.4310.4010.3810.3610.3410.3210.29

10.2710.2510.24

2,9902,9802,9702,9602,9502,9402,9202,9102,9002,8902,8802,8702,8602,840

2,8402,8202,8102,8002,7902,7802,7702,7602,7402,6902,7202,7102,7002,6902,6802,6602,6502,6502,6302,6202,6102,6002,5902,570

2,5602,5502,540

58


DateHour

(c.d.t.)

Gage height (ft)

05528000 Des

Oct. 4--Continued

Oct. 5

040005000600070008000900100011001200130014001500160017001800190020002100220023002400

010002000300040005000600070008000900100011001200130014001500160017001800190020002100

10.2110.1910.1910.1810.1710.1510.1310.1110.1010.0810.0710.0510.0310.019.999.969.949.919.909.879.85

9.839.809.789.769.749.729.709.689.669.649.629.609.589.569.559.539.519.499.469.449.42

Discharge (ft3 /s)

Plaines River

2,5302,5202,5202,5102,5102,5002,4902,4802,4702,4602,4602,4502,4402,4202,4102,4002,3902,3702,3702,3502,340

2,3302,3202,3102,3002,2902,2802,2702,2602,2502,2402,2302,2202,2102,2002,1902,1802,1702,1602,1502,1402,130

Hour Date (c.d.t.)

Gage height (ft)

Discharge CftVs)

near Gurnee- -Continued

Oct. 5-- 2200Continued 2300

2400

Oct. 6 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Oct. 7 01000200030004000500060007000800090010001100120013001400

9.409.389.36

9.339.319.299.279.249.229.209.189.179.159.139.119.099.079.059.039.018.998.988.958.928.918.888.86

8.848.818.798.778.758.738.708.698.668.658.628.608.588.54

2,1202,1102,100

2,0902,0802,0702,0602,0402,0302,0202,0202,0102,0001,9901,9801,9701,9601,9501,9501,9401,9301,9201,9101,9001,8901,8801,870

1,8601,8501,8401,8301,8201,8101,8001,7901,7801,7701,7601,7501,7401,730

59

Table 3. --Data for selected streamflowfloods of late September and early 0

Hour Date (c.d.t.)

Gage height (ft)

05528000 Des


17001800190020002100220023002400

Oct. 8 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Oct. 9 0100020003000400050006000700

8.538.518.498.478.458.428.408.388.368.33

8.318.298.268.248.228.198.178.158.138.118.098.078.048.038.017.997.967.947.927.897.877.857.837.81

7.797.777.747.727.707.687.66

-gaging stations for thectober 1986 --Continued

Discharge Hour (ftVs) Date Cc.d.t.)

Plaines River near

1,720 Oct.1,710 Cont1,7001,700

Gage height (ft)

Discharge CftVs)

Gurnee- -Continued

9-- 0800inued 0900

10001100

1,690 12001,670 13001,670 14001,660 15001,650 16001,640 1700

18001,630 19001,620 20001,610 21001,600 22001,590 23001,580 24001,5701,560 Oct. 10 01001,550 02001,540 03001,540 04001,530 05001,5201,5101,5001,5001,4801,4801,4701,460

06000700080009001000110012001300

1,450 14001,4401,4301,420

1500160017001800

1,420 19001,410 20001,400 21001,3901,3801,3701,370

220023002400

7.647.627.597.587.557.537.517.497.477.467.447.427.407.387,367.347.33

7.317.297.277.257.237.217.197.177.157.137.117.107.087.067.047.027.006.996.976.956.936.926.916.89

1,3601,3501,3401,3401,3201,3201,3101,3001,2901,2901,2801,2801,2701,2601,2501,2501,240

1,2401,2301,2201,2201,2101,2001,2001,1901,1801,1701,1701,1601,1601,1501,1401,1401,1301,1301,1201,1101,1101,1001,1001,100

60

Table 3.--Data for selected streamflow-Easing stations for thefloods

Date (cHour .d.t.)

of late

Gage height (ft)

September and

Discharge CftVs)

early October

Date (c

1986-

Hour .d.t.

-Continued

Gage height

) Cft)Discharge (ft*/s)

05529000 Des Plaines River near Des Plaines

Sept. 24

Sept. 25

010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

010002000300040005000600070008000900100011001200130014001500160017001800

2.132.122.102.082.072.052.042.022.012.001.991.981.971.961.951.951.941.941.931.941.961.982.142.26

2.392.532.682.762.803.093.223.353.483.603.693.793.873.964.044.114.184.26

1,0201,010

994974965945936917908898889880870861852852843843834843861880

1,0301,150

1,2901,4001,4501,4701,4801,5501,5901,6301,6601,7001,7301,7601,7801,8101,8301,8501,8701,900

Sept. 25-- 1900 Continued 2000

2100 2200 2300 2400

Sept. 26

Sept. 27

4.334.394.464.534.604.69

,920,940,960,980,000

2,030

010002000300040005000600070008000900100011001200130014001*500160017001800190020002100220023002400

01000200030004000500060007000800090010001100

4.764.844.914.985.055.125.195.245.315.365.425.465.635.775.875.966.026.086.146.196.246.286.336.38

6.436.486.546.606.666.736.796.866.957.047.14

2,0502,0702,0902,1102,1402,1602,1802,1902,2102,2302,2502,2602,3202,3702,4102,4402,4702,4902,5202,5402,5602,5702,5902,610

2,6302,6502,6802,7002,7202,7502,7802,8002,8402,8802,920

61

Table 3.-- Data for selected streamflowfloods of late

DateHour

Cc.d.t.)

Gageheight(ft)

05529000 Des

Sept. 27-Continued

Sept. 28

Sept. 29

- 1200130014001500160017001800190020002100220023002400

010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

0100020003000400

7.217.327.397.487.537.687.767.857.938.008.078.148.20

8.268.328.388.438.488.518.568.598.638.668.708.738.768.798.808.838.848.868.878.899.089.179.259.30

9.359.409.439.45

September and earlv 0 gaging stations for the:-tober 1986 - -Continued

Discharge Hour(ftVs) Date (c.d.t

Plaines River near De.

2,940 Sept2,990 Cont3,0203,050

; Plaines --

29-- 0500.nued 0600

07000800

3,070 09003,130 10003,160 11003,200 12003,230 13003,260 14003,2903,3203,340

1500160017001800

3,360 19003,390 20003,410 21003,430 22003,450 23003,460 24003,4903,500 Sept I 30 01003,5203,5303,5503,5603,5803,5903,5903,6103,6103,6203,6303,640

020003000400050006000700080009001000110012001300

3,720 14003,760 15003,800 16003,820 1700

18003,840 19003,8603,8803,890

200021002200

Gageheight

.) (ft)

Continued

9.499.519.559.579.609.629.639.659.709.739.869.97

10.0310.1110.1710.2210.2610.3010.3210.32

10.3310.3510.3810.4010.4110.4210.4410.4510.4610.4710.5210.5410.5610.5910.6310.6810.7110.7410.7810.8010.8210.84

DischargeCftVs)

3,9103,9203,9403,9503,9703,9803,9804,0004,0304,0404,1204,1804,2204,2904,3304,3704,4004,4304,4504,450

4,4604,4704,5004,5104,5204,5304,5404,5504,5604,5704,6104,6204,6404,6604,7004,7404,7604,7904,8204,8404,8504,870

62

Table 3.--Data for selected streamflow-gaging stations for thefloods of late September and earlv October 1986 - -Continued

Hour Date (c.d.t.)

Gage height (ft)

05529000 Des

Sept. 30-- 2300Continued 2400

Oct. 1 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Oct. 2 010002000300040005000600070008000900100011001200130014001500

10.8610.87

10.8810.8810.8810.8810.8710.8610.8510.8410.8510.8410.8810.8710.8710.8810.8710.8610.8510.8410.8210.8110.8010.7810.7710.75

10.5410.7210.7010.6810.6710.6510.6310.6110.5810.5410.5210.5010.4710.4410.42

Discharge (ft3 /s)

Plaines River

4,8804,890

4,9004,9004,9004,9004,8904,8804,8804,8704,8804,8704,9004,8904,8904,9004,8904,8804,8804,8704,8504,8404,8404,8204,8104,790

4,6204,7704,7504,7404,7304,7104,7004,6804,6604,6204,6104,5904,5704,5404,530

Hour Date C c.d.t

near Des Plaines- -


1800190020002100220023002400

Oct. 3 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Oct. 4 01000200030004000500060007000800

Gage height

. ) (ft)

Continued

10.3910.3610.3310.3010.2710.2310.2010.1810.15

10.0810.0810.0610.0310.009.989.989.979.979.959.949.939.929.919.899.879.849.829.809.779.749.719.699.65

9.629.599.569.539.509.489.469.43

Discharge (ft3 /s)

4,5004,4804,4604,4304,4104,3804,3604,3404,320

4,2604,2604,2504,2204,2004,1904,1904,1804,1804,1704,1604,1604,1504,1504,1404,1204,1104,1004,0804,0704,0504,0304,0204,000

3,9803,9603,9403,9303,9103,9003,8903,880

63

Table 3.-- Data for selected streamflow-jfloods of late September and early Ocl

HourDate Cc.d.t.)

GageheightCft)

05529000 Des


11001200130014001500160017001800190020002100220023002400

Oct. 5 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Oct. 6 0100

9.419.399.379.359.329.319.299.269.229.219.189.149.119.079.049.00

8.978.938.898.858.818.778.728.698.648.608.568.528.488.428.388.328.298.238.198.148.098.037.997.93

7.87

DischargeCft3 /s) Dat(

Plaines River near Des

3,870 Oct.3,860 Contii3,8503,840

paging stations for the:ober 1986 - -Continued

Houri Cc.d.t

Plaines- -

6-- 0200med 0300

04000500

3,830 06003,820 07003,820 08003,800 09003,780 10003,780 11003,770 12003,750 13003,730 14003,720 ' 15003,700 16003,680 1700

18003,670 19003,650 20003,640 21003,620 22003,600 23003,580 24003,5603,550 Oct. 7 01003,520 02003,500 03003,490 04003,470 05003,450 06003,430 07003,410 08003,390 09003,380 10003,350 11003,340 12003,320 13003,300 14003,2703,2603,230

3,210

15001600170018001900

Gageheight

.) Cft)

Continued

7.827.777.717.667.617.527.487.437.377.317.267.217.157.107.056.996.936.886.836.786.726.686.61

6.576.526.466.416.366.316.256.226.176.126.066.025.975.935.875.825.795.755.70

DischargeCftVs)

3,1903,1703,1403,1203,1003,0803,0503,0303,0102,9802,9602,9402,9202,9002,8802,8602,8302,8102,7902,7702,7502,7302,700

2,6902,6702,6402,6202,6002,5802,5602,5502,5302,5102,4802,4702,4502,4302,4102,3902,3802,3702,350

64

Table 3.--Data for selected streamflow-gaging stations for thefloods of late September and early October 1986 --Continued

Hour Date (c.d.t.)

Gage height (ft)

05529000 Des


220023002400

Oct. 8 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Oct. 9 010002000300040005000600070008000900100011001200

5.665.625.585.535.49

5.455.415.375.325.285.255.215.165.125.085.045.004.964.924.884.844.814.764.734.694.654.614.574.54

4.494.464.424.384.354.314.294.254.214.184.144.10

Discharge CftVs)

Plaines River

2,3302,3202,3002,2802,270

2,2602,2402,2302,2202,2002,2002,1802,1702,1602,1402,1302,1202,1102,1002,0802,0702,0602,0502,0402,0302,0202,0001,9901,980

1,9701,9601,9501,9301,9301,9101,9101,9001,8801,8701,8601,850

Hour Date (c.d.t

near Des Plaines --


1500160017001800190020002100220023002400

Oct. 10 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Oct. 11 01000200030004000500

Gage height

.) Cft)

Continued

4.074.034.003.973.943.913.883.853.813.783.753.72

3.693.663.633.603.563.533.503.473.443.413.383.353.313.293.263.233.203.173.153.123.093.063.033.01

2.982.952.932.902.87

Discharge CftVs)

1,8401,8301,8201,8101,8001,7901,7801,7801,7601,7601,7501,740

1,7301,7201,7101,7001,6901,6801,6701,6601,6501,6401,6301,6301,6101,6101,6001,5901,5801,5701,5701,5601,5501,5401,5301,520

1,5201,5101,5101,5001,490

65

Table 3.--Data for selected streamflow-gaging stations for thefloods of late

DateHour

Cc.d.t.)

Gage height (ft)

05529000 Des

Oct. 11-Continued

Oct. 12

- 0600070008000900100011001200130014001500160017001800190020002100220023002400

01000200030004000500060007000800090010001100120d13001400150016001700180019002000210022002300

2.852.822.802.772.752.722.702.682.652.642.612.592.582.562.542.522.512.502.48

2.472.452.442.432.412.402.392.382.372.362.352.342.342.322.312.302.282.272.262.262.252.242.23

September and early Oct

Discharge CftVs) Date

Plaines River near Des

:ober 1986- -Continued

Hour i (c.d.t.)

Gage height Cft)

Discharge Cft3 /s)

Plaines --Continued

1,490 Oct. 12-- 24001,480 Continued1,480 Oct. 13 01001,470 02001,470 03001,4601,4601,4501,4501,4401,430

040005000600070008000900

1,430 10001,4201,410

11001200

1,400 13001,390 14001,390 15001,380 16001,360 1700

18001,360 19001,340 20001,3301,3201,3101,3001,2901,280 Oct.1,2701,260

2100220023002400

14 010002000300

1,250 04001,240 05001,240 06001,220 07001,210 08001,190 09001,170 10001,160 11001,150 12001,1501,1401,1301,120

1300140015001600

2.22

2.212.212.202.202.202.192.182.172.172.162.162.152.152.152.142.142.132.132.122.122.122.112.112.11

2.102.102.092.092.082.082.072.072.062.062.152.072.072.062.062.05

1,110

1,1001,1001,0901,0901,0901,0801,0701,0601,0601,0501,0501,0401,0401,0401,0301,0301,0201,0201,0101,0101,0101,0001,0001,000

994994984984974974965965955955

1,040965965955955945

66

Table 3.--Data for selected streamflow-gaging stations for thefloods of late September and earlv October 1986- -Continued

Hour Date (c.d.t.)

Gage height Discharge (ft) (ft3 /s)

Hour Date (c.d.t.)

Gage height Discharge (ft) (ft3 /s)

05529000 Des Plaines River near Des Plaines- -Continued

Oct. 14--Continued

Sept. 24

Sept. 25

Sept. 26

1700180019002000

1800 190020002100220023002400

0100 02000300040005000600070008000900100011001200130014001500 160017001800190020002100220023002400

0100 02000300

2.052.052.042.04

05535000

2.03 2.022.062.162.302.672.94

3.22 3.754.374.815.145.455.685.876.016.136.216.266.296.246.10 5.975.875.775.705.635.585.535.485.43

5.39 5.345.29

945945936936

Skokie

13 131416203343

56 80

113139161182198213224233241273275271258 246237228222216212208204199

196 192188


23002400

River at Lake Forest


0600070008000900100011001200 130014001500160017001800190020002100220023002400

Sept. 27 0100 02000300040005000600070008000900100011001200 13001400

2.032.032.022.02

5.25 5.195.155.115.105.125.115.085.04 5.005.045.165.556.277.287.978.168.238.258.278.27

8.27 8.258.248.238.218.198.178.148.118.078.027.98 7.937.87

926926917917

185 180177174173175174172169 166169178209274376455478487489492492

492 489488487484482479476472467461456 450443

67


Hour Date Cc.d.t.)

Gage height Discharge (ft) CftVs) Date

05535000 Skokie River at Lake For


17001800190020002100220023002400

Sept. 28 0100 0200030004000500060007000800 0900100011001200130014001500160017001800190020002100220023002400

Sept. 29 0100 020003000400050006000700

7 7 77777777

6 6666666 6666555555555555

5 555555

.80

.75

.67

.59

.51

.43

.34

.26

.17

.09

.98

.89

.79

.69

.59

.50

.41

.32

.24

.17

.11

.03

.97

.91

.85

.79

.73

.67

.61

.54

.60

.70

.73

.76

.78

.79

.79

.78

.77

.77

.76

Gage Hour height Discharge

(c.d.t.) (ft) Cft3 /s)

2st- -Continued

435 Sept. 29-- 0800 5.76 429 Continued 0900 5.76 420 1000 5.75410401392382374364356

344 335324314304296287

1100 5.761200 5.861300 5.921400 5.981500 6.041600 6.171700 6.361800 6.521900 6.62 2000 6.722100 6.792200 6.852300 6.912400 6.90

278 Sept. 30 0100 6.84 271 0200 6.77264259251246241235230225220214209214222225227

229 230230229228228227

0300 6.710400 6.640500 6.560600 6.490700 6.420800 6.360900 6.301000 6.251100 6.221200 6.251300 6.281400 6.281500 6.341600 6.411700 6.511800 6.551900 6.56 2000 6.532100 6.472200 6.402300 6.322400 6.23

227 227 226227236241247252264282298307 317324331337336

330 322316309301295288282276272269272274274280287297300301 298293286278270

68


Hour Date (c.d.t.)

Gage height Discharge (ft) CftVs)

Hour Date Cc.d.t.)

Gage height Discharge (ft) (ftVs)

05535000 Skokie River at Lake Forest- -Continued

Oct. 1 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Oct. 2 010002000300040005000600070008000900100011001200

6.156.065.985.905.835.765.695.625.555.535.515.465.415.365.315.265.205.155.125.075.034.994.954.91

4.864.824.794.754.724.694.654.624.594.554.534.49

262254247240233227221215209208206202198194190186181177175171168165162159

155152150147145143140138136133132129


1500160017001800190020002100220023002400

Oct. 3 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

4.454.414.384.344.304.264.224.194.154.124.094.06

4.074.053.993.953.923.904.024.134.154.134.094.054.003.973.933.953.933.883.843.803.703.673.643.61

126124122119116114111109107105103101

1021019795939299

106107106103101989694959491888680797776

69

Table 3.--Data for selected streamflow-gaging stations for thefloods of late September and early Octc

HourDate (c.d.t.)

Sept. 22 1800190020002100220023002400

Sept. 23 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Sept. 24 0100020003000400050006000700080009001000

Gage height (ft)

05548280

4.264.264.575.275.926.596.98

7.157.267.287.287.187.147.137.137.137.137.137.137.157.157.217.237.267.357.467.557.687.807.938.06

8.138.308.418.568.668.788.888.969.059.09

Discharge (ft3 /s) Date

Nippersink Creek near

132 Sept. 2132 Continv,180304433580

>ber 1986 --Continued

Hour (c.d.t.)

Spring Grove

4-- 1100ed 1200

1300140015001600

671 17001800

712 1900738 2000743 2100743 2200719709707707 Sept. 2

23002400

5 0100707 0200707 0300707 0400707 0500712 0600712 0700726731738761

0800090010001100

788 1200810 1300843 1400874 1500908 1600941

9601,010

1700180019002000

1,030 21001,080 22001,1001,1401,1601,190 Sept. 21,2101,220

23002400

6 010002000300

Gage height Cft)

9.159.189.249.259.279.279.279.289.289.239.219.199.209.68

11.5611.0811.5911.7611.8011.8011.7211.6811.6511.6411.6311.6211.5911.5911.5811.5311.5611.5511.5411.5411.5711.6311.6911.76

11.8111.8811.93

Discharge CftVs)

1,2401,2501,2701,2701,2701,2701,2701,2801,2801,2601,2601,2501,2501,390

1,6601,8201,9902,0402,0602,0602,0302,0202,0102,0002,0002,0001,9901,9901,9801,9701,9801,9701,9701,9701,9802,0002,0202,040

2,0602,0802,100

70

Table 3.--Data for selected streamflow-gaElng stations for thefloods of late September and early October 1986

DateHour

(c.d.t.)

Gage height Cft)

Discharge (ftVs)

05548280 Nippersink Creek

Sept. 26-Continued

Sept. 27

- 040005000600070008000900100011001200130014001500160017001800190020002100220023002400

010002000300040005000600070008000900100011001200130014001500160017001800190020002100

12.2412.3112.4212.4912.5512.6312.7412.8712.8913.1113.6013.7713.9914.1414.2214.2514.2114.1514.0713.9813.87

13.8313.7313.7013.6513.6113.5813.5213.4813.3113.2813.3113.3513.3013.3113.1713.1213.0813.0312.9612.9312.88

2,2002,2302,2602,2902,3102,3402,3702,4202,4202,5002,6702,7302,8102,8702,9002,9102,8902,8702,8402,8102,770

2,7602,7202,7102,6902,6802,6702,6502,6302,5702,5602,5702,5902,5702,5702,5202,5002,4902,4702,4502,4402,420

Hour Date Cc.d.t

near Spring Grove --

Sept. 27-- 2200Continued 2300

2400

Sept. 28 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Sept. 29 01000200030004000500060007000800090010001100120013001400

- -Continued

Gage height

. ) Cft)

Continued

12.8112.7712.70

12.6512.6012.5212.4712.4112.3312.2612.2212.1512.0912.0211.9611.8711.8311.7411.6811.6011.5011.4611.4811.4811.4411.3911.33

11.2611.1911.1211.0510.9710.9310.8910.8510.8010.7510.6810.6310.5610.51

Discharge CftVs)

2,4002,3802,360

2,3402,3202,3002,2802,2602,2402,2102,2002,1702,1502,1302,1102,0802,0702,0402,0201,9901,9601,9501,9501,9501,9401,9201,900

1,8801,8601,8401,8101,7901,7801,7601,7501,7301,7201,7001,6801,6601,640

71

Table 3.--Data for selected streamflow-gaging stations for thefloods of late September and earlv Octjober 1986

DateHour

(c.d.t.)

Gage height (ft)

Discharge (ftVs) Date

05548280 Nippersink Creek near Sprir

Sept. 29-Continued

Sept. 30

Oct. 1

- 1500160017001800190020002100220023002400

010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

0100020003000400050006000700

10.5410.5710.5610.5510.5410.5410.5310.5110.5110.50

10.5010.5010.4910.4910.4910.4910.4910.5110.5110.5310.5610.5810.6210.6510.6610.7110.7210.7710.7910.8210.8710.8710.9110.93

10.9610.9610.9811.0011.0011.0011.00

1,650 Oct.1,660 Contir1,6601,6601,6601,660

Hour (c.d.t

g Grove --

1-- 0800ued 0900

1000110012001300

1,650 j 14001,650 15001,650 16001,640 1700

18001,640 19001,640 20001,640 21001,640 22001,640 23001,640 24001,6401,640 Oct. 2 01001,640 02001,650 03001,660 04001,6701,6801,6901,6901,7101,7101,7201,730

05000600070008000900100011001200

1,740 13001,760 14001,7601,770

15001600

1,780 17001800

1,780 19001,780 20001,790 21001,800 22001,800 23001,8001,800

2400

- -Continued

Gage height

.) (ft)

Continued

11.0011.0010.9810.9710.9510.9310.9010.8710.8310.7910.7410.7010.6610.6110.5610.5010.50

10.4010.3410.2810.2210.1610.1010.049.969.939.859.799.759.709.649.599.539.469.409.359.279.219.169.109.04

Discharge (ft*/s)

1,8001,8001,7901,7901,7801,7801,7701,7601,7401,7301,7201,7001,6901,6701,6601,6401,630

1,6101,5901,5701,5601,5401,5201,5001,4801,4701,4401,4301,4101,4001,3801,3701,3501,3301,3101,3001,2701,2601,2401,2301,210

72


HourDate Cc.d.t.)

Gage height Cft)

Discharge Hour CftVs) Date Cc.d.t.)

Gage height Cft)

Discharge CftVs)

05548280 Nippersink Creek near Spring Grove --Continued

Oct. 3 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Oct. 4 010002000300040005000600070008000900100011001200

8.998.968.918.848.818.758.708.658.608.558.518.468.418.378.358.318.288.248.198.168.138.108.048.00

7.987.947.917.887.857.837.827.797.787.777.757.74

1,1901,1901,1701,1501,1401,1301,1101,1001,0901,0701,0601,0501,0301,0201,0201,0101,000

989976968960952936926

921910902895887882879871869866861859

05550000 Fox

Sept. 26 010002000300

3.083.093.09

3,6803,7003,700


1500160017001800190020002100220023002400

Oct. 5 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

River at Algonquin

Sept. 26 040005000600

7.737.717.697.687.677.667.657.647.627.617.607.59

7.577.567.557.537.527.517.517.497.497.497.497.497.487.487.467.457.437.417.397.377.357.337.327.29

3.103.113.11

856851846843841838836833828825823820

815813810805803800800795795795795795793793788785780775770765761756753746

3,7303,7503,750

73

Table 3.

Date

Sept. 26-Continued

Sept. 27

floods

Hour(c.d.t.

- 070008000900100011001200130014001500160017001800190020002100220023002400

010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

--Data for selected streamfloviof late September and early C

Gageheight

) (ft)

05550000

3.113.123.133.143.143.153.163.203.233.263.293.323.343.353.373.383.393.41

3.433.443.453.463.473.483.493.503.513.513.523.533.533.543.543.553.563.573.583.593.603.613.613.6-2

r- gaging stations for thectober 1986- -Continued

Discharge Hour(ft3 /s) Date (c.d.t.)

Fox River at Algonqiiin- -Continued

3,750 Sept3,7803,8003,8303,8303,8503,880

. 28 0100020003000400050006000700

3,980 08004,060 09004,130 10004,210 11004,290 12004,3404,3704,4204,4504,4704,530

1300140015001600170018001900

4,580 20004,6104,6304,6604,6904,7104,740 Sept4,7704,8004,8004,8204,8504,8504,8804,8804,910

2100220023002400

. 29 0100020003000400050006000700080009001000

4,930 11004,960 12004,990 13005,020 14005,0405,0705,0705,100

1500160017001800

Gageheight(ft)

3.623.623.633.633.633.643.643.643.653.653.653.653.653.653.653.653.663.663.673.683.713.713.713.71

3.713.713.713.723.723.723.733.743.743.743.753.753.753.763.783.793.803.80

Discharge(ft3 /s)

5,1005,1005,1305,1305,1305,1605,1605,1605,1805,1805,1805,1805,1805,1805,1805,1805,2105,2105,2405,2705,3505,3505,3505,350

5,3505,3505,3505,3805,3805,3805,4105,4405,4405,4405,4705,4705,4705,5005,5505,5805,6105,610

74


Date

Sept. 29-Continued

Sept. 30

Oct. 1

Hour (c.d.t.

- 190020002100220023002400

010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

01000200030004000500060007000800090010001100

Gage height

) (ft)

05550000

3.803.803.813.813.813.82

3.823.823.823.823.833.833.833.833.833.843.863.863.863.883.893.893.893.893.903.903.903.903.903.90

3.903.903.903.903.903.903.903.903.913.923.92

Discharge Cft3 /s)

Fox River

5,6105,6105,6405,6405,6405,670

5,6705,6705,6705,6705,7005,7005,7005,7005,7005,7305,7905,7905,7905,8405,8705,8705,8705,8705,9005,9005,9005,9005,9005,900

5,9005,9005,9005,9005,9005,9005,9005,9005,9305,9605,960

Hour Date (c.d.t.)

at Algonquin- -Continued


14001500160017001800190020002100220023002400

Oct. 2 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Oct. 3 0100020003000400

Gage height (ft)

3.923.923.933.933.933.933.933.933.933.933.933.933.93

3.943.943.943.943.943.953.953.953.953.953.953.953.953.953.953.953.953.953.953.953.963.963.963.96

3.963.963.973.97

Discharge (ft3 /s)

5,9605,9605,9905,9905,9905,9905,9905,9905,9905,9905,9905,9905,990

6,0206,0206,0206,0206,0206,0506,0506,0506,0506,0506,0506,0506,0506,0506,0506,0506,0506,0506,0506,0506,0806,0806,0806,080

6,0806,0806,1106,110

75

Table 3.- -Data for selected streamflo\floods of late September and earlv (

Hour Date Cc.d.t.)


070008000900100011001200130014001500160017001800190020002100220023002400

Oct. 4 0100020003000400050006000700080009001000110012001300140015001600170018001900200021002200

Gage height (ft)

05550000

3.973.983.993.993.993.983.983.983.983.983.983.983.993.983.983.983.983.983.973.97

3.973.973.973.973.973.973.983.983.983.983.973.973.973.973.973.973.973.963.963.963.953.95

Discharge (ft3 /s) DC

Fox River at Algonc

6,110 Oct6 , 140 Con16,1706,170 Oct6,1706,140

<- gaging stations for thejctober 1986- -Continued

Hour =.te (c.d.t.)

Gage height CfO

Discharge CftVs)

uin- -Continued

4-- 2300:inued 2400

5 010002000300

6,140 04006,140 05006,140 06006,140 07006,140 08006,1406,1706,1406,1406,1406,1406,140

0900100011001200130014001500

6,110 16006,110 1700

18006,110 19006,1106,1106,1106,1106,1106,1406,140 Oct6,1406,1406,1106,110

20002100220023002400

6 01000200030004000500

6,110 06006,110 07006,110 08006,110 09006,110 10006,080 11006,0806,0806,0506,050

1200130014001500

3.943.94

3.943.943.933.933.933.923.923.913.903.903.883.873.873.883.883.893.893.883.883.883.873.873.873.87

3.863.863.863.853.853.853.843.843.843.843.833.833.823.823.81

6,0206,020

6,0206,0205,9905,9905,9905,9605,9605,9305,9005,9005,8405,8105,8105,8405,8405,8705,8705,8405,8405,8405,8105,8105,8105,810

5,7905,7905,7905,7605,7605,7605,7305,7305,7305,7305,7005,7005,6705,6705,640

76


Date

Oct. 6--Continued

Oct. 7

Oct. 8

Hour (c.d.t.)

160017001800190020002100220023002400

010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

0100020003000400050006000700

Gage height (ft)

05550000

3.813.813.813.803.803.793.793.783.78

3.783.773.773.773.763.763.753.753.743.733.723.713.713.703.703.693.683.683.693.693.683.683.673.67

3.673.663.663.663.663.653.65

Discharge (ft3 /s)

Fox River

5,6405,6405,6405,6105,6105,5805,5805,5505,550

5,5505,5205,5205,5205,5005,5005,4705,4705,4405,4105,3805,3505,3505,3205,3205,3005,2705,2705,3005,3005,2705,2705,2405,240

5,2405,2105,2105,2105,2105,1805,180

Hour Date (c.d.t.)

at Algonquin- -Continued


100011001200130014001500160017001800190020002100220023002400

Oct. 9 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Gage height Cft)

3.653.653.643.643.643.643.643.643.643.653.653.643.643.643.643.633.63

3.623.623.623.623.613.613.613.613.603.603.603.603.603.593.593.593.583.583.573.563.563.563.553.55

Discharge Cft3 /s)

5,1805,1805,1605,1605,1605,1605,1605,1605,1605,1805,1805,1605,1605,1605,1605,1305,130

5,1005,1005,1005,1005,0705,0705,0705,0705,0405,0405,0405,0405,0405,0205,0205,0204,9904,9904,9604,9304,9304,9304,9104,910

77

Table 3.--Data for selected streamflow-naging stations for thefloods of late September and early 0<

Date

Oct. 10

Oct. 2

Oct. 3

Hour(c.d.t.)

010002000300040005000600070008000900100011001200

1800190020002100220023002400

01000200030004000500060007000800090010001100120013001400150016001700180019002000

Gageheight(ft)

05550000

3.553.543.543.533.533.533.523.523.523.513.513.51

05567500

4.274.254.224.184.174.194.33

4.896.147.358.86

10.1911.0111.6512.1312.6012.9213.1513.4013.8414.1914.4514.6514.9815.3115.5115.67

ttober 1986- -Continued

Discharge Hour(ft3 /s) Date (c.d.t.)

Fox River at Algonqi

4,910 Oct.4,880 Cont:4,8804,8504,850

lin- -Continued

10-- 1300.nued 1400

150016001700

4,850 18004,820 19004,820 20004,820 21004,8004,8004,800

220023002400

Mackinaw River near Coneerville

970 Oct.961 Cont]

3-- 2100.nued 2200

948 2300930 2400926935 Oct.997

1,2601,9702,8003,9705,1305,9406,6207,1507,6808,0608,3408,640

4 010002000300040005000600070008000900100011001200130014001500

9,200 16009,630 17009,960 1800

10,200 190010,60011,10011,30011,600

2000210022002300

Gageheight(ft)

3.513.513.503.503.503.493.493.483.483.483.483.48

15.9016.2016.4816.84

17.2018.0418.2118.5318.8219.1019.1919.4119.4219.6119.4319.4619.3319.3319.2019.1618.9818.9018.7618.7618.4918.5518.44

Discharge(ft3 /s)

4,8004,8004,7704,7704,7704,7404,7404,7104,7104,7104,7104,710

11,90012,60013,40014,400

15,60018,70020,10023,10026,00029,10030,10032,70032,80035,30033,00033,30031,70031,70030,20029,80027,80026,90025,40025,40022,70023,20022,200

78


DateHour

(c.d.t.)

Gage height (ft)

Discharge (ft3 /s)

05567500 Mackinaw River

Oct. 4--ContinuedOct. 5

Oct. 6

2400

010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

010002000300040005000600070008000900100011001200130014001500

18.37

18.2018.0918.0317.9217.7817.7417.7217.6717.5217.4117.2917.1617.0716.9116.8116.6616.4916.2916.1415.9915.8115.6115.3915.17

14.9114.6314.3113.8913.3612.7012.0011.4110.8710.399.999.729.519.329.18

21,600

20,00019,10018,60018,10017,60017,50017,40017,20016,70016,30015,90015,50015,20014,70014,40013,90013,40012,80012,40012,00011,70011,50011,20010,900

10,50010,2009,7809,2608,6007,8007,0006,3605,8005,3204,9404,7004,5204,3604,240

Hour Date Cc.d.t.)

Gage height Cft)

Discharge (ft3 /s)

near Conge rville- -Continued


1800190020002100220023002400

Oct. 7 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Oct. 8 0100020003000400050006000700

9.038.918.798.718.618.548.488.428.37

8.308.258.208.128.037.917.897.937.877.857.827.777.747.677.657.607.567.527.467.437.407.357.297.25

7.227.197.167.147.097.067.01

4,1104,0103,9203,8503,7703,7203,6703,6203,580

3,5303,4903,4503,3903,3203,2303,2103,2403,2003,1803,1603,1203,0903,0403,0202,9902,9602,9202,8802,8602,8302,8002,7502,720

2,7002,6802,6602,6402,6102,5902,550

79

Table 3.--Data for selected streamflow-igaging stations for thefloods

Hour Date (c.d.t.)

of late September and early Ocitober 1986 --

Gage height Cft)

Discharge Hour (ft3 /s) Datje (c.d.t.)

05567500 Mackinaw


100011001200130014001500160017001800190020002100220023002400

Oct. 9 0100020003000400050006000700080009001000110012001300140015001600

66666666666666666

6666666666666666

.99

.95

.91

.90

.86

.83

.80

.76

.73

.71

.63

.62

.59

.55

.53

.51

.44

.40

.42

.39

.38

.37

.35

.34

.34

.32

.31

.30

.28

.26

.24

.23

.21

2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,

2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,

05584500

Sept. 29 12001300140015001600

6679

11

.07

.39

.40

.14

.45 1,

Continued

Gage height (ft)

Discharge fft 3 /s) !

River near Congerville- -Continued

540 Oct.i

9-- 1700510 Continued 1800480470450420400380360340 Oct.290280260230220210160

140150130120120100100100080080070060050030030010

190020002100220023002400

10 01000200

! 0300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

66666666

666665555555555555555555

.20

.18

.17

.15

.14

.13

.11

.09

.08

.06

.04

.03

.01

.98

.98

.97

.95

.93

.92

.92

.90

.90

.89

.87

.85

.82

.79

.79

.76

.75

.73

.72

21111111

111111111111111111111111

,010,990,990,980,970,960,950,940

,930,920,910,900,890,870,870,860,850,830,830,830,820,820,810,800,780,760,740,740,720,720,700,700

La Moine River at Colmar

377 Sept,423 Conti573870320

29-- 1700nued 1800

190020002100

1315161717

.55

.10

.27

.13

.78

1222

. 3

,770,120,430,750,030

80


Date

Sept. 29-Continued

Sept. 30

Oct. 1

Hour (c.d.t.

- 220023002400

010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

01000200030004000500060007000800090010001100120013001400

Gage height

, ) Cft)

05584500

18.2518.5718.84

19.0519.1919.3419.4719.5519.6419.6819.6719.6019.5119.3919.3019.2419.2019.1919.1819.1819.1819.2219.2219.2819.3719.4419.56

19.7119.8820.0220.1620.2820.4120.5720.7120.8520.9621.0821.1621.2421.28

Discharge Cft3 /s)

La Moine River

3,3203,5703,800

3,9804,1504,3304,5104,6304,7604,8304,7704,6304,4804,2904,1504,0403,9603,9203,8703,8403,8103,8003,7703,7703,8103,8403,890

4,7905,0305,2605,4905,7005,9106,2106,4606,6806,8507,0507,2107,3907,470

Hour Date (c.d.t.)

Gage height Cft)

Discharge CftVs)

at Colmar- -Continued


17001800190020002100220023002400

Oct. 2 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Oct. 3 0100020003000400050006000700

21.3121.3321.3421.3421.3321.3321.3121.3121.2821.25

21.2421.2121.1821.1421.0921.0420.9820.9220.8420.7520.6420.5420.4120.2720.1219.9419.7519.5519.3119.0718.8518.7018.8719.30

19.6920.0120.2120.3920.5420.6820.84

7,5507,5807,6107,6107,5807,5807,5507,5507,4707,420

7,3907,3107,2607,1807,0506,9606,8706,7706,6606,5106,3506,1505,9105,6805,4305,1404,8504,5904,3104,0303,8403,7103,8504,300

4,7705,2405,5705,8806,1506,4206,660

81

Table 3.--Data for selected streamflow-gaging stations for thefloods of late September and early Oct

Date

Oct. 3--Continued

Oct. 4

Hour (c.d.t

08000900100011001200130014001500160017001800190020002100220023002400

010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Gage height

) (ft)

05584500

21.1121.4221.7722.1022.3422.5322.6622.7422.8222.8522.8922.9322.9723.0223.1023.2223.34

23.5123.6823.8023.9824.1724.3424.5024.7024.8424.9925.1125.2225.3125.3725.4525.4825.4725.4525.4325.4125.4025.3925.3425.37

Discharge (ftVs) Date

ober 1986- -Continued

Hour (c.d.t.)

Gage height (ft)

Discharge (ftVs)

La Moine River at Colmlar- -Continued

7,100 Oct.7,8008,660

1

5 010002000300

9,520 040010,200 050010,800 060011,300 070011,600 080011,900 090012,000 100012,200 110012,300 120012,500 130012,700 140013,000 150013,400 160014,000 1700

180014,700 190015,50016,10016,80017,70018,50019,300

20002100220023002400

20,400 Oct. 6 010021,300 020022,30023,30024,20025,00025,600

03000400050006000700

26,300 080026,600 090026,500 100026,300 110026,10025,900

12001300

25,800 140025,700 150025,30025,600

16001700

25.3325.3125.2725.2825.2425.2125.1825.1525.0925.0525.0124.9624.9124.9024.8024.7124.6724.6024.5224.4124.3224.1824.0724.03

23.9423.8723.7623.6823.5823.4823.3923.2923.2023.1423.0622.9722.8822.7822.6922.5822.46

25,20025,00024,70024,70024,40024,10023,90023,60023,10022,80022,40022,00021,60021,50020,80020,10019,80019,40018,90018,20017,70017,00016,40016,200

15,70015,30014,60014,20013,70013,20012,80012,30011,90011,60011,30010,90010,50010,1009,7909,4209,030

82

Table 3.--Data for selected streamflow-gae:ing stations for the

Date

Oct. 6--Continued

Oct. 7

Oct. 8

floods

Hour (c.d.t.

1800190020002100220023002400

010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

0100020003000400050006000700080009001000

of late September and early October 1986- -Continued

Gage height

) (ft)

05584500

22.3422.2222.1021.9821.8621.7421.64

21.5321.4021.2821.1621.0320.9120.7920.6620.5420.4220.3020.1920.0519.9219.7819.6219.4819.2919.1018.9018.7118.5018.2918.08

17.8617.6417.4117.1816.9416.7016.4516.1815.9215.68

Discharge (ft3 /s)

La Moine River

8,6608,2907,9507,6107,2906,9806,790

6,5806,3506,1405,9305,7105,5205,3305,1404,9604,8004,6604,5304,3804,2304,0803,9303,8203,6703,5303,3803,2503,1003,0102,920

2,8302,7502,6602,5702,4802,4102,3302,2502,1802,140

Hour Date Cc.d.t.)

Gage height Cft)

Discharge CftVs)

at Colmar- -Continued


130014001500160017001800190020002100220023002400

Oct. 9 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Oct. 10 010002000300

15.4515.2114.9714.7714.5514.3614.1613.9613.7813.5913.4113.2413.0712.91

12.7612.6212.4812.3612.2312.1212.0011.8911.7911.6811.5911.5011.4111.3311.2511.1711.1011.0210.9510.8810.8210.7510.6810.62

10.5610.5010.44

2,0902,0401,9901,9401,8901,8501,8001,7501,7101,6701,6301,6001,5601,530

1,5001,4701,4501,4201,3901,3701,3401,3201,3001,2701,2501,2401,2201,2001,1801,1701,1501,1401,1201,1101,1001,0901,0701,060

1,0501,0401,030

83

Table 3.--Data for selected streamflow-gftging stations for the floods of late September and early October 1986--Continued

DateHour

(c.d.t.)

Gageheight(ft)

Discharge Hour(ft3/s) Date (c.d.t. )

Gageheight(ft)

Discharge(ft3 /s)

05584500 La Moine River at Colmar--Continued


060007000800090010001100120013001400

10.3810.3210.2610.2110.1510.1010.0610.029.999.939.89

1,020 Oct.1 , 000 Contim

993

LO-- 1500led 1600

1700984 1800973 1900964 2000957 2100950 2200945934927

23002400

9.869.829.789.749.709.669.629.599.569.52

922915908901894887880875870863

1 No gage-height record; discharge based ori high-water mark and shape of hydrograph.

84

Table 4.--Total rainfall and recurrence intervals at selected

[<,

Map number1

National Weather Servicestorms of

less than; >, greater than; and Atmospheric

Station name

stations inAugust 13-14.

Illinois during1987

the

rainfall data from the National Oceanic Administration (1987b)]

Time of daily

reading2 (hour)

Augus tTotal rainfall (inches)

13-14. 1987Recurrence interval3 (years)

NORTHWEST

55 59

104107128146

Freeport wastewater plant GalvaMoline WSO APMorrisonPaw Paw 1 ERockford WSO AP

0700 07002400070006002400

1.37 1.282.093.052.926.42

<2 <2<2<2<235

NORTHEAST

5324195

170 173

858 6489

105139

7492

103112119138

AntiochChicago O'Hare WSO AP De KalbMarengo Waukegan Wheaton 3 SE

Avon 5 NEGalesburg GoldenLa Harpe MonmouthQuincy FAA AP

Havana 4 NELincolnMinonkMount PulaskiNormalPrinceville

07002400 07000700 0600 0700

WEST

07000700 08000700 18002400

CENTRAL

070007000800070016001800

2.309.35 5.712.60 5.64 6.01

0.901.53 3.472.30 1.154.81

0.36.12.26.00.52.64

<2>100

20<2 20 25

<2<2 <2<2 <25

<2<2<2<2<2<2

85

Table 4.--Total rainfall and recurrencejintervals at selectedNational Weather Service stations in ^Illinois during the

storms of August 13-14. 1987--Continued

Map number1

Station name

Time of daily

reading2 (hour)

Augus tTotal rainfall (inches)

13-14, 1987Recurrence interval3 (years)

EAST

38627783

135136162

DanvilleGibson City 1 EHoopeston 1 NEKankakee water

pollution centerPiper CityPontiacUrbana

1700 0.040700 .470700 .000700

070007002400

.08

.60

.59

.11

<2<2<2<2

<2<2<2

1 Map number refers to figure 1.2 Central standard time.3 Determined according to the techniques of Huff and Angel (1989).

86

Table 5.--Total rainfall collected at unofficial rainfall-gaging stationsduring the storms of August 13-14. 1987. for the period 0900 hours

central standard time August 13 through 1200 hours centralstandard time August 14

[Rainfall data from E.E. Evans, U.S. Soil Conservation Service (written commun., 1987)]

Station Total rainfall _____________name______________________________(inches)

NORTHEAST

Arlington Heights 9.5Carpentersville 4.25 Chicago (North & Springfield Streets) 5.87Darien 1.2Des Plaines 9.06

Downers Grove 4.98Du Page County Airport 6.4Elk Grove 6.5Elmhurst 4.4Glendale Heights 7.2

Hanover Park 9.1Hoffman Estates 6.7Libertyville 2.5McHenry 4.58MWRDGC (1-290) 9.2

MWRDGC (Howard & McCormick Street) 6.8Morton Arboretum 6.4Mount Prospect 7.1Palatine Park District 6.44Park Ridge 9.31

Park Ridge (East of Cumberland) 10.75Villa Park 7.2Winfield 6.8Woodstock 4.0

87

Tabl

e 6.--Summary

of peak stages and

discharges for

the

floods of

Au

gust

14-17, 1987.

at selected

00

stre

amf lo

w-ga

ging

st

atio

ns in

northern Illinois

2 3

[mi

, sq

uare

mil

es;

WY,

water

year;

ft,

feet;

ft /s,

cubi

c fe

et per

second

Map

Stat

ion

number number

Station

name

UPPER

Drainage

area

MISS

ISSI

PPI

Period

of

reco

rd

(WY)

; <,

less th

an;

Previously recorded

maximum

floo

dType

of

record

Date

Gage

height

(ft)

RIVE

R BA

SIN

ABOVE

THE

ILLI

NOIS

Discharge

(fr/

s)

>, gr

eate

r th

an]

Maximum

flood

of August 19

87

Date

Gage

height

(ft)

Discharge

(fr/s)

Recu

rren

ce

interval

(yea

rs)

RIVE

R

Rock

Riv

er b

asin

91

05438250 Coon C

reek

at

Ri

ley,

III.

9 05438500 K

ishw

auke

e Ri

ver

at Be

lvid

ere,

III.

92

0543

9000 S

outh

Br

anch

Kishwaukee R

iver

at D

e Ka

lb,

III.

93

05439500 S

outh

Branch Kishwaukee R

iver

near

Fairdale,

III.

10

0544

0000

Kishwaukee R

iver ne

arPerryville,

III.

' 94

05

444000 Elkhorn

Cree

k ne

ar Penrose, III.

95

0544

6000

Ro

ck Cr

eek

at M

orn"

son,

III.

85.1

538 77.7

387

1,099

146

164

1961-82,

1983-

1940

-1925-34,

1980-

1940

-

1940-

1940-

1940-42,

1978-86,

1987-

D C D D D D D D D D C

07-02-78

03-1

6-43

07-02-83

04-2

2-73

03-21-79

05-17-74

01-0

6-46

9 13 15 10 20 216

Z16.7

3

.10

.80

.22

.48

.53

.04

5,09

0

10,300

3,50

0

8,46

0

16,700

6,77

05,

770

14 14 15 17 15 15 14 14

8.15

9.34

9.59

9.74

9.94

14.45

6.72

15.4

7

2,11

0

4,590

1,01

01,080

5,30

0

8,720

1,19

01,

770

5 3 4 4 4 3 <2 <2

Ill INOIS RIVFR BASIN

Des

Plai

nes

21

0552

8000

Des P

laines R

iver

nea

r Gurnee,

III.

22

05528500 Bu

ffal

o Cr

eek

near

Wheelin

g, II

I.23

05529000 D

es Plaines

Rive

r near

Des

Plaines, III.

24

05529500 M

cDonald

Cree

k ne

ar M

ount Prospect,

25

0553

0000

Weller

Cree

k at

Des Pl

aine

s, III.

26

05530990 Sa

lt Cr

eek

at Ro

llin

g Mead

ows,

III.

27

05531500 Sa

lt Cr

eek

at W

estern S

prin

gs,

III.

28

05532000 A

ddison C

reek

at

Bel

I woo

d, III.

29

0553

2500

De

s Plaines

River

at Riverside, III

30

05533000 Fl

ag Cr

eek

near

Willow

Springs, III

232 19.6

360

III.

7.93

13.2

30.5

115 17.9

630 16.5

1946-58,

1960-68,

1969

-19

52-

1941

-

1952-

1951-

1974-

1946-

1951-

1944

-19

51-

Rive

r D C D D D D D D D D D D

basin

09-2

7-86

07-22-82

10-01-86

06-2

0-72

06-1

0-67

12-0

3-82

12-0

5-82

08-07-82

10-0

3-86

09-14-61

11 7 10 7 15 12 8 10 8 13

.95

.94

.88

.58

.09

.56

.71

.68

.87

.71

3,53

0

887

4,90

0

664

1,59

0

1,060

2,070

839

7,590

2,68

0

14 14 14 14 14 14 17 14 15 17

4.79

7.34

8.77

*8.0

814

.80

*14.03

*10.54

*12.84

*9.90

7.07

555

717

3,37

0

*806

1,490

*1,650

*3,540

*1,120

*9,770 620

<2 15 7 50 25

>100

>100

>100

>100 <2

Tabl

e 6.

--Su

mmar

y of pe

ak stages an

d discharges for

the

floods of

Au

gust

14-17. 1987.

at se

lect

edst

ream

f lo

w-ga

ging

st

atio

ns in

Map

number

Stat

ion

number

Station

name

Drai

nage

ar

ea

(mi*)

Period

of

reco

rd

(WY)

northern

1 1 linois- -Co

ntin

ued

Previously r

ecor

ded

maximum

floo

dType

of

record

Date

Gage

he

ight

(f

t)Discharge

(fr/

s)

Maximum

floo

d of

Au

gust

19

87

Date

Gage

heig

ht

(ft)

Discharge

(fr/

s)

Recu

rren

ce

inte

rval

(y

ears

)

ILLI

NOIS

RI

VER

BASIN- -Continued

Des

Plaines

Rive

r

31 32 33 34 35 36 37 41 96 42 43 44 45

05533400 Sa

wmil

l Creek

near

Le

mont

, III.

05534500 N

orth

Br

anch

Chicago

Rive

r at

Deer

fiel

d, II

I.05

5350

00 Skokie R

iver

at Lake Forest,

III.

05535070 Skokie R

iver

nea

r Hi

ghla

nd P

ark, III.

0553

5500

Wes

t Fork o

f No

rth

Branch Chicago

Rive

r at Northbrook,

III.

0553

6000

Nor

th B

ranc

h Ch

icag

o Ri

ver

at*

Nile

s, III.

05536215 Thorn

Cree

k at Gl

enwo

od,

III.

0553

6500

Tinley C

reek ne

ar Palos

Park

, III.

05539900 W

est

Bran

ch D

u Page R

iver

ne

arWe

st C

hicago,

III.

0554

0060

Kr

ess

Cree

k at W

est

Chic

ago,

III.

05540095 We

st Br

anch

Du

Page R

iver

near

Warrenville, III.

0554

0200

St

. Joseph Cr

eek

at Lisle, III.

05540500 D

u Pa

ge R

iver at Sh

orew

ood,

III.

13.0

19.7

13.0

21.1

11.5

100 24.7

11.2

28.5

18.1

90.4

11.8

324

1962-79,

1986

-1952-

1952-

1967

-1952-

1951-

1949-

1951-

1961

-

1961-80,

1986

-

1969-

1961

-76,

1986-

1941

-

bas

i n-

- Con

t i nued

C D D D D D D D D D C D D FP D D

05-1

2-66

04-1

8-75

07-22-82

09-2

6-86

12-0

3-82

07-22-82

06-11-67

08-17-68

10-1

0-54

12-0

3-82

07-1

8-64

12-0

3-82

10-0

3-86

10-1

1-54

12.94

12.94

10.9

3

8.27

8.46

9.66

9.83

11.26

10.3

010.44

7.90

4.88

5.81

11.0

6

984

984

756

492

724

1,07

0

2,21

0

2,60

01,

930

984

637

2,16

0

649

12,000

17 14 14 14 14 14 17 17 14 14 15 14 17

11.70

*11.52

5.98

*9.09

*10.10

*11.

35

9.18

4.69

10.63

7.37

*5.8

5

8.10

6.16

216

*933 247

*895

*1,190

*2,590 792

225

958

573

*3,050

*1,230

3,650

<2

>100 3

>100

>100

>100 <2 <2 35 35

>100

>100 <2

Fox

Rive

r basin

97 98 99 51

05550500 Po

plar

Cre

ek at

El

gin,

III.

05551200 Fe

rson

Creek ne

ar St

. Charles, III.

0555

1700

Bl

ackb

erry

Cre

ek ne

arYorkville, III.

0555

2500

Fox

Rive

r at

Da

yton

, II

I.

35.2

51.7

70.2

2,64

2

1951

-1961-

1961

-

1915-

D D D D

04-22-73

02-20-71

07-0

3-83

10-11-54

5.45

7.64

9.91

24.63

896

1,970

2,06

0

47,100

15 14 16 15

4.98

6.35

6.45

10.7

2

599

1,180

493

7,29

0

7 4 <2 <2

New

peak o

f re

cord

established d

uring

this

flood.

D, continuous d

ischarge record;

C, pe

ak-s

tage

and

peak-discharge

record o

nly;

FP

, fl

ood

prof

ile-

-pea

k-st

age

record o

nly.

Information

furnished

by H

ighlan

d Pa

rk Engineer.

Table 7.--Data for selected streamflow-gaging stations forthe floods of August 14-17. 1987

[c.d.t., central daylight time; ft, feet;

Hour Date (c.d.t.)

Gage height (ft)

ft3/3 , cubic feet per second]

Discharge Hour (ft3 /s) Date (c.d.t.)

Gage height (ft)

Discharge (ft3 /s)

05528500 Buffalo Greek near Wheeling

Aug. 13 1800 190020002100220023002400

Aug. 14 0100 020003000400050006000700080009001000 11001200130014001500160017001800190020002100220023002400

Aug. 15 0100 0200030004000500060007000800

1.10 1.101.101.101.102.292.74

3.01 3.283.534.393.684.296,466.876.737.26 7.306.956.656.356.186.406.326.145.995.905.865.835.775.69

5.65 5.595.505.425.375.355.325.30

2 . 6 Aug 2 . 6 Conl2.62.62.6

4269

87 107127197138188498596562695 Aug. 706615543472433485466423390375369365356344

339 331318306300298293290

i -

15-- 0900 :inued 1000

1100120013001400150016001700 1800190020002100220023002400

16 0100 0200030004000500060007000800090010001100120013001400150016001700 1800190020002100220023002400

5 55555555 5544444

4 4444444444444444 4443333

.26

.24

.21

.18

.15

.12

.09

.08

.05

.03

.02

.97

.96

.92

.91

.88

.86

.85

.80

.81

.79

.76

.73

.73

.70

.69

.66

.63

.61

.56

.51

.45

.39

.31

.19

.06

.82

.96

.66

.47

285 282279274271267265264260 258258252251248247244

241 240236237235232230230226225222220218214209203197 190181169150161137122

90

Table 7.--Data for selected streamflow-gaging stations forthe floods of August

Date

Gage Hour height

(c.d.t.) (ft)Discharge (ft*/s)

14-17. 1987 --Continued

Gage Hour height

Date Cc.d.t.) Cft)Discharge Cft3 /s)

Aug. 17

Aug. 13

Aug,

05528500 Buffalo Creek near Wheeling--Continued

010002000300040005000600070008000900100011001200

1800190020002100220023002400

14 01000200030004000500060007000800090010001100120013001400150016001700180019002000

3.423.343.273.223.173.093.053.022.982.942.902.85

05529500

0.92.92.92.92.92

2.453.00

3.603.924.605.115.004.986.026.696.997.267.447.637.857.958.038.078.068.048.017.95

1181121061039993908885827976

McDonald Creek

0.50.50.50.50.50

2340

6377

110136130129189272350436506585689740784806801790767735

Aug. 17-- 1300Continued 1400

1500160017001800190020002100220023002400

near Mount Prospect


23002400

Aug. 15 01000200030004000500060007000800090010001100120013001400150016001700180019002000210022002300

827874

2.712.682.652.622.582.562.542.512.49

747169676563615958565553

7.907.827.747.65

7.537.387.247.106.966.856.726.576.416.205.925.635.355.064.774.484.223.993.793.633.943.363.27

709669631590

539480429384342312279249226205182166154141128116104948678716561

91

Table 7.--Data for selected streamflowhgaging stations forthe floods of Aueust 14-17. 1987 --Continued

Hour Date Cc.d.t.)

Gage height Cft)

Discharge fftVs)

Gage Hour height

Date (c.d.t.) Cft)Discharge CftVs)

05529500 McDonald Creek near Mount PJrospect--Continued

Aug. 15-- 2400ContinuedAug. 16 0100

0200 0300 0400 0500 0600 0700 0800 0900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400

Aug. 13

Aug. 14

1800190020002100220023002400

010002000300040005000600

3.18

3.113.063.002.962.912.872.832.802.762.782.782.762.722.692.652.632.612.582.572.542.522.542.682.79

57 Aug.

545149474544424139404039383735353433333231323641

17 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

05530000 Weller Creek at De6 Plaines

0.60.60.60.60.60

4.626.46

6.557.697.92

10.009.738.27

1 . 9 Aug . J.4-- 07001.9 Continued 08001.91.91.9

462705

716853880

1,0901,060

917

090010001100120013001400150016001700180019002000

92

3.063.343.433.423.303.153.002.892.792.712.652.602.552.512.492.452.422.402.372.342.322.302.282.27

9.0812.2813.3814.1614.5414.7914.7614.4913.9413.3212.3910.859.728.90

516469686255494441383534323130292827262525242323

9991,2901,3801,4401,4701,4901,4901,4701,4201,3701,3001,1701,060

954

Table 7.--Data for selected streamflow-gaging stations for the floods of August 14-17. 1987--Continued

Date

GageHour height Discharge

(c.d.t.) (ft) CftVs) Date

GageHour height Discharge

(c.d.t.) (ft) (ft3 /s)

05530000 Weller Creek

Aug.

Aug.

Aug.

14 2100220023002400

15 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

16 0100020003000400050006000700080009001000

8.267.767.427.15

6.876.596.315.985.705.525.585.325.014.764.554.444.414.364.253.833.503.403.343.283.213.163.083.03

2.992.942.872.832.782.722.672.622.562.89

870795744704

6626165685144644324443973442992622442392312101411121061029995928784

82797774726866646078

at Des Plaines- -Continued


130014001500160017001800190020002100220023002400

Aug. 17 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

2.912.672.442.322.262.192.152.122.072.001.981.983.413.58

3.262.622.392.302.222.192.142.062.021.971.941.941.921.881.871.871.851.841.811.801.791.781.771.77

796655494744424138363535

106117

986452484544413837353333333131313030292928272727

93

Table 7.--Data for selected streamflow-gaging stations for

Hour Date (c.d.t.)

Aug. 13 1800 190020002100220023002400

Aug. 14 0100 020003000400050006000700 0800 09001000 1100 12001300 1400 150016001700 1800 1900 20002100 2200 2300 2400

Aug. 15 0100 0200030004000500060007000800 09001000

the floods of August 14-17.

Gage height (ft)

L9 87 --Continued

Discharge (ft3 /s) Da

05530990 Salt Creek at Rol

1.70 1.731.731.731.794.275.11

6.57 7.268.059.819.769.07

11.58 13.22 13.7813.97 14.03 13.9813.50 13.25 12.9412.8012.62 12.42 12.20 11.9711.77 11.52 11.26 10.97

10.67 10.4010.139.939.719.469.259.04 8.848.62

Hour He (c.d.t.)

ling Meadows

0.98 Aug. 15-- 1100 1.8 Continued 12001.81.82.5

149216

130014001500160017001800

404 1900 493 2000602 2100872 2200864754

1,180 1,490 Aug. 1,600

23002400

16 0100 0200

1,640 0300 1,650 0400 1,640 05001,540 0600 1,500 0700 1,430 08001,410 09001,370 1000 1,330 1100 1,290 1200 1,250 13001,210 1,170 1,120 1,070

1,020 970925892856815782

1400 1500 1600 170018001900 20002100220023002400

749 AugJ 17 0100 719 0200685 0300

Gage height (ft)

8.44 8.238.077.907.727.557.407.257.11 6.946.756.626.466.29

6.13 5.965.80 5.65 5.495.35 5.20 5.084.964.85 4.72 4.63 4.534.45 4.35 4.27 4.214.144.05 3.993.933.964.434.54

4.53 4.524.47

Discharge (ft3 /s)

659 628605581555532511491473 451426410390370

351 331313 296 278263 247 235223212 199 191 181174 165 158 152146139 133129131172182

181 180176

94

Table 7.--Data for selected streamflow-gaging stations forthe floods

Hour Date Cc.d.t.)

Gage height (ft)

05530990

Aug. 17--Continued

04000500060007000800090010001100120013001400

4.4.4.4.4.3.3.3.3.3.3.

of August 14-17. 1987- -Continued

Discharge Hour CftVs) Date (c.d.t.)

Salt

3522150701969185817471

05531500

Aug. 13

Aug . 14

1800190020002100220023002400

010002000300040005000600070008000900100011001200130014001500160017001800190020002100

1.1.1.1.1.2.3.

4.4.5.6.6.6.7.7.7.8.8.9.9.9.9.9.

10.10.10.10.10.

91899092974203

019683306795195086185607537691991117201919

1,1,1,1,1,1,2,2,2,2,3,3,3,3,3,3,

Gage height (ft)

Discharge Cft3 /s)

Creek at Rolling Meadows- -Continued

165153147140135131127122119113111

Salt

5957586167

129216

365516658760905030140300500690930290650840970040140200220220220


17001800190020002100220023002400

Creek at Western Springs


2400

Aug. 15 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

3333333333

101010

101010109999999999999999

10101010

.65

.61

.56

.51

.46

.43

.44

.38

.33

.28

.17

.15

.11

.09

.04

.03

.00

.97

.94

.94

.92

.92

.92

.92

.91

.91

.94

.93

.94

.95

.96

.99

.98

.01

.02

.03

.05

333

333332222222222233333333

1061039996929191878581

,200,180,uo

,130,080,070,050,020,990,990,980,980,980,980,970,970,990,980,990,000,010,040,030,050,060,070,090

95

Table 7.--Data for selected streamflow-gaging stations for the floods of August 14-17. 1987--Continued

HourDate (c .d.t.)

Gageheight(ft)

Discharge(ft3 /s)

HourDatte (c d.t.)

Gageheight(ft)

Discharge(ft3 /s)

Aug. 16

Aug. 17

05531500 Salt Creek at Western Springs--Continued

Aug.| 17-- 1900 Continued 2000

| 2100 2200 2300 2400

010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

010002000300040005000600070008000900100011001200130014001500160017001800

10.0610.0710.0910.0910.1110.1210.1010.1210.1210.1310.1310.1310.1410.1110.1210.1210.1010.0910.0710.0510.0110.1410.2610.34

10.3810.4510.4910.5310.5310.5110.5110.4610.4410.4010.3610.3010.2310.1710.1210.0610.009.95

3,1003,1103,1303,1303,1403,1503,1303,1503,1503,1603,1603,1603,1703,1403,1503,1503,1303,1303,1103,0903,0503,1703,2803,350

3,3903,4603,4903,5303,5303,5103,5103,4703,4503,4103,3703,3203,2503,2003,1503,1003,0503,000

Aug. 18

Aug. 19

010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

01000200030004000500060007000800090010001100

9.879.819.759.689.639.56

9.489.419.349.259.169.058.948.838.718.598.498.448.348.278.198.128.078.027.977.927.877.817.757.68

7.627.557.487.407.337.247.167.076.996.926.84

2,9302,8802,8302,7702,7302,670

2,6102,5502,5002,4302,3602,2802,2002,1202,0401,9501,8901,8501,7901,7501,7001,6501,6201,5901,5601,5301,5001,4701,4401,400

1,3601,3301,2901,2501,2101,1701,1301,0801,0501,020

979

96

Table 7.--Data for selected streamflow-gaging stations forthe floods of August 14-17. 1987 --Continued

Hour Date Cc.d.t.)

Gage height Cft)

Discharge CftVs)

Hour Date Cc.d.t.)

Gage height Cft)

Discharge CftVs)

05531500 Salt Creek at Western Springs --Continued

Aug. 19--Continued

1200130014001500160017001800

6.786.726.666.616.566.506.46

952926901880859834818

05532500 Des Plaines

Aug. 13

Aug . 14

1800190020002100220023002400

010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

3.033.033.033.033.043.113.40

3.864.264.765.245.485.685.815.946.306.556.766.987.207.367.527.687.797.938.108.258.388.498.608.71

192192192192195234418

8311,2901,8502,2902,5302,7302,8602,9903,4003,6503,8904,2404,5904,8405,1105,3705,5705,8006,1206,3906,6406,8507,0507,270


2100220023002400

River at Riverside

Aug. 15 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Aug. 16 0100020003000400050006000700

6.416.366.306.246.196.12

8.848.969.099.249.369.479.579.669.749.809.829.869.899.909.909.899.889.859.859.829.819.799.769.75

9.719.679.659.629.609.579.55

798780760743730713

7,5307,7808,0408,3608,6108,8409,0609,2409,4209,5609,6109,7009,7509,7709,7709,7409,7309,6709,6609,6109,5709,5309,4609,430

9,3409,2809,2109,1609,1009,0509,000

97

Table 7.--Data for selected streamflow-gaging stations forthe floods of August 14-17, 1

Hour Date (c.d.t.)

Gage height (ft)

05532500


100011001200130014001500160017001800190020002100220023002400

Aug. 17 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

9.9.9.9.9.9.9.9.9.9.9.9.9.9.9.9.9.

9.9.9.9.9.9.9.9.9.9.9.9.9.9.9.9.9.9.8.8.8.8.8.8.

Des

5248454240373431282521191612113237

404143434342424038353229262318120600938577696052

987 --Continued

Discharge Hour CftVs) Daie (c.d.t.)

Plaines River at Rr<

88888888888888888

888888888888888877777776

,930 Aug.,840,790,730,670,620,570

Gage height (ft)

Discharge (ftVs)

'erside- -Continued

18 0100020003000400050006000700

,500 0800,430 0900,360 1000,280 1100,230 1200,170 1300,100,070,520

140015001600

,630 17001800

,680 1900,700 2000,750 2100,750 2200,750 2300,730 2400,730,670 Aug. 19 0100,640 0200,580 0300,510 0400,450 0500,380 0600,320 0700,210,100,960

080009001000

,840 1100,710 1200,550 1300,390 1400,230,070,900

150016001700

888888777777777777776666

66666666665555555

.43

.35

.27

.18

.10

.01

.94

.86

.79

.72

.65

.62

.58

.51

.44

.37

.29

.22

.14

.05

.97

.88

.81

.73

.65

.57

.50

.43

.37

.30

.24

.17

.12

.05

.99

.93

.87

.81

.75

.70

.65

666665555555554444444433

33333333333222222

,730,580,420,260,120,950,830,680,550,440,320,270,210,100,980,860,740,630,500,350,220,080,960,860

,760,670,600,530,470,400,340,260,190,120,040,980,920,860,800,750,700

98

Table 7.--Data for selected streamflow-gaging stations forthe floods of August 14-17. 1987- -Continued

Gage Hour height

Date Cc.d.t.) Cft)

05532500 Des

Aug. 19--Continued

Aug. 20

1800190020002100220023002400

01000200030004000500060007000800

5.605.555.495.455.405.355.30

5.265.225.175.135.105.075.035.01

Discharge CftVs)

Gage Hour height

Date (c.d.t.) Cft)Discharge CftVs)

Plaines River at Riverside- -Continued

2,6502,6002,5402,5002,4502,4002,350

2,3102,2702,2202,1802,1502,1202,0802,060

05534500 North Branch

Aug. 13

Aug . 14

1800190020002100220023002400

0100020003000400050006000700080009001000110012001300140015001600

3.193.193.193.193.194.384.61

5.305.756.818.178.027.85

10.1011.0411.4311.5211.4311.3111.0410.7410.5110.27

0.20.20.20.20.20

9.713

3454

111217203188500797912933912885797688613542


11001200130014001500160017001800190020002100220023002400

Chicago River at Deerfield

4.974.944.914.884.854.834.804.784.764.734.714.704.684.674.654.64

Aug. 14-- 1700 10.08Continued 1800

190020002100220023002400

Aug. 15 010002000300040005000600070008000900100011001200130014001500

9.899.729.579.459.319.199.06

8.968.838.648.528.448.368.308.218.128.037.977.917.857.797.72

2,0302,0001,9801,9501,9301,9101,8901,8701,8501,8201,8001,7901,7801,7601,7501,730

495455421393371348329313

301286265252244236230221212204199193188183177

99

Table 7.--Data for selected streamflow-gaging stations for

Hour Date Cc.d.t.)

the floods of August 14-17. 1987 --Continued

Gage height Discharge Hour Cft) Cft3 /s) Date (c.d.t.)

05534500 North Branch Chicago River a

Aug. 15-- 1600 Continued 1700

1800190020002100 220023002400

Aug. 16 0100 0200030004000500060007000800090010001100120013001400150016001700180019002000

Aug. 13 1800 190020002100220023002400

Aug. 14 0100 0200

7.66 7.577.517.517.397.35 7.297.227.15

7.07 7.016.946.876.846.896.896.896.897.016.966.906.856.806.786.756.716.666.626.58

05535070

3.37 3.373.373.333.313.874.42

5.16 5.56

172 Aug. 165 Cont]160160151148 Aug . 143

Gage height Cft)

Discharge Cft3 /s)

t Deerf ield- -Continued

16-- 2100 .nued 2200

23002400

17 0100 0200

138 0300133 0400

0500128 0600 124 0700119 0800115 0900113 1000116 1100116 1200116 1300116 140012412011711311010910710510210097

Skokie River near I

5 . 0 Aug . 5.0 Conti5.04.03.6

2252

1500160017001800190020002100220023002400

[ighland Park

14-- 0300 nued 0400

050006000700080009001000

111 1100 142 1200

6.54 6.656.716.73

6.73 6.706.666.616.566.52 6.486.456.426.406.366.316.246.196.146.096.046.015.975.925.885.755.435.21

6.09 6.936.886.708.038.588.778.928.97 9.07

95 101105106

106 104102999694 929088878583797774727068666563584639

187 280273248535707774829848 887

100

Table 7.--Data for selected streamflow-gaging stations forthe floods of August

DateHour

Cc.d.t.

Gage height

, ) Cft)Discharge CftVs)

14-17. 1987 --Continued

Hour Date Cc.d.t.)

Gage height Cft)

Discharge CftVs)

05535070 Skokie River near Highland Park- -Continued

Aug. 14- Continued

Aug. 15

Aug. 16

- 1300 14001500160017001800190020002100220023002400

0100 020003000400050006000700 08000900100011001200130014001500160017001800190020002100220023002400

0100 02000300040005000600

9.07 9.039.018.978.888.798.718.658.588.498.428.30

8.21 8.118.017.897.807.727.66 7.577.487.407.307.227.137.076.956.836.726.636.506.376.256.135.995.87

5.71 5.575.465.355.255.19

887 871863848814781752731707677654616

588 558530496472451436 414393374352335316304283266251239224212201191178168

154 143134126118113


090010001100120013001400150016001700180019002000 2100220023002400

Aug. 17 0100 0200030004000500060007000800090010001100120013001400150016001700180019002000 2100220023002400

5.08 4.994.935.025.165.145.044.984.924.854.844.764.684.63 4.594.654.864.98

4.96 4.864.764.684.624.564.544.534.514.484.464.424.394.384.344.334.334.334.294.27 4.384.364.344.32

105 9993

10111111010297928685787267 64698797

96 87787267626059585654514948454545454241 48474544

101

Table 7.--Data for selected streamflow-gaging stations forthe floods of August 14-17. 19£

Hour Date (c.d.t.

05535500

Aug. 13 1800190020002100220023002400

Aug. 14 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

Aug. 15 0100020003000400050006000700080009001000

Gage height

) (ft)

West

1111113

4557767999

1010999998887766

5544444333

Fork

.30

.28

.27

.26

.26

.70

.82

.99

.33

.70

.01

.01

.40

.99

.07

.63

.97

.06

.04

.93

.74

.56

.35

.06

.79

.45

.13

.76

.36

.94

.38

.81

.30

.89

.55

.30

.14

.18

.95

.69

.48

Discharge (ft3 /s) Date

7- -Continued

Gage Hour height

(c.d.t.) (ft)Discharge (ft3 /s)

of North Branch Chicago River at Northbrook

7.5 Aug. JL5-- 1100 3.256.8 Continued 1200 3.106.56.26.2

29188

281309340499499414683

1300 2.981400 2.871500 2.731600 2.621700 2.531800 2.431900 2.352000 2.282100 2.212200 2.152300 2.102400 2.06

923 Aug. 16 0100 2.021,0601,1501,1801,1701,1401,0901,040

991921857781712637561487411

350307273245225213216

0200 1.980300 1.950400 1.910500 1.880600 1.850700 1.830800 1.810900 1.811000 2.301100 2.461200 2.221300 2.061400 1.971500 1.911600 1.871700 1.821800 1.781900 1.742000 1.722100 1.702200 1.782300 2.322400 2.34

198 Aug. ;17 0100 2.14178162

0200 2.010300 1.93

1461351261181091019588827772676360

575350474441393737799073605247433834312928348082

665649

102

Table 7.--Data for selected streamflow-gaging stations forthe floods

Hour Date (c.d.t.

05535500 West

Aug. 17-- Continued

0400 0500060007000800090010001100120013001400

Gage height

) (ft)

of August

Discharge (ft3 /s)

14-17, 1987- -Continued

Gage Hour height

Date (c.d.t.) (ft)Discharge (ft3 /s)

Fork of North Branch Chicago River at Northbrook- -Continued

11111111111

.86

.81

.77

.74

.72

.73

.81

.82

.80

.78

.75

05536000

Aug. 13

Aug . 14

1800 1900 200021002200 23002400

0100 0200030004000500 06000700 0800 0900 1000 1100120013001400150016001700180019002000 2100

11 113 66

6 7888 77 8 9

10 10111111111111111110 10

.56

.56

.55

.55

.97

.61

.63

.50

.81

.61

.57

.29

.98

.76

.67

.82

.61

.87

.22

.34

.34

.29

.24

.19

.11

.03

.95

.87

42 37343129303738363432

North Branch

1111 111 1 2 2222222222 2

15 15 1414

329 862866

838 ,200,470,450,360 ,250,180 ,490 ,920 ,260 ,370,530,580,580,560,540,510,480,440,410 ,370


17001800190020002100220023002400

Chicago River at Niles


2400

Aug. 15 0100 0200030004000500 0600070008000900 10001100 1200 1300 1400 1500160017001800190020002100220023002400

1. 1.1.1.1.1.1.1.1.1.

10. 10. 10.

10. 10.10.10.10. 10.10.10.10. 10.10. 10. 10. 10. 10.9.9.9.9.9.9.9.8.8.

74 737271696867656463

83 79 74

72 68656263 60545044 3832 25 18 09 01907664503520059177

2 2 2

2 2222 2222 22 2 2 2 2111111111

31 302929272625242323

,350 ,330 ,310

,300 ,290,270,260,260 ,250,220,210,180 ,160,130 ,100 ,070 ,030 ,000,960,900,850,800,740,680,630,570,520

103

Table 7

Hour Date (c.d.t.)

.--Data for selected streamflowthe floods of August 14-17. 19!

Gageheight Discharge (ft) (ft3 /s) Date

05536000 North Branch Chicano River 4

Aug. 16 010002000300040005000600070008000900100011001200130014001500160017001800190020002100220023002400

8.63 1,470 Aug.8.50 1,4308.37 1,3808.26 1,3508.14 1,3008.04 1,2707.93 1,2407.83 1,2007.73 1,1707.70 1,1607.60 1,1307.51 1,1007.42 1,0807.33 1,0507.25 1,0307.16 1,0007.07 9796.98 9556.89 9336.79 9086.70 8866.84 9207.09 9857.03 968

-gaging stations forM - -Continued

GageHour height

(c.d.t.) (ft)

^t Niles- -Continued

17 0100 6.900200 6.800300 6.730400 6.670500 6.620600 6.560700 6.510800 6.460900 6.401000 6.351100 6.291200 6.241300 6.191400 6.131500 6.081600 6.031700 5.981800 5.941900 5.892000 5.842100 5.792200 5.742300 5.702400 5.66

Discharge (ft3 /s)

935910893879867852840829816805792781771758748737727718708698687677669661

05540060 Kress Creek at Wes!t Chicago

Aug. 13 1800190020002100220023002400

Aug. 14 01000200030004000500060007000800

3.58 0.26 Aug. j 14-- 0900 7.163.58 .26 Continued 1000 7.133.58 .263.60 .374.48 394.44 365.04 89

4.95 795.13 995.34 1285.35 1295.48 1485.48 1485.98 2326.85 428

1100 7.271200 7.321300 7.351400 7.351500 7.341600 7.321700 7.331800 7.301900 7.262000 7.172100 7.022200 6.842300 6.702400 6.58

512504543558567567564558561552540515471423386358

104

Table 7.--Data for selected streamflow-gaglnE stations forthe floods of August

Hour Date (c.d.t

Gage height

. ) Cft)Discharge (ft3 /s)

05540060 Kress Creek at

Aug. 15 0100 0200030004000500060007000800090010001100120013001400 1500160017001800190020002100220023002400

Aug. 16 0100 02000300040005000600070008000900100011001200

6.47 6.376.306.286.236.186.116.035.985.945.905.795.845.81 5.775.745.715.695.655.635.615.595.575.53

5.50 5.465.425.405.375.355.325.305.295.305.315.31

333 309294289279268253236227220213195204198 191186180177172169165162159154

150 144138135131128123120119120122122

14-17. 1987 --Continued

Hour Date (c.d.t.)

Gage height (ft)

Discharge (ft3 /s)

West Chicago --Continued


1500160017001800190020002100220023002400

Aug. 17 0100 020003000400050006000700080009001000110012001300 14001500160017001800190020002100220023002400

5.30 5.285.275.255.235.215.195.175.156.216.166.31

6.44 6.516.456.376.306.236.096.116.056.005.955.915.86 5.835.785.735.705.655.605.565.525.505.485.46

120 117117114112109106104101281270302

331 346333315300285255259246236227220212 207198189184175167161154151148146

U.S. GOVERNMENT PRINTING OFFICE: 1993 746-979 105

FLOODS OF SEPTEMBER 26-OCTOBER 4, 1986, AND AUGUST 14 … · a southbound Chicago Transit Authority...

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Transcript of FLOODS OF SEPTEMBER 26-OCTOBER 4, 1986, AND AUGUST 14 … · a southbound Chicago Transit Authority...