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1

FINAL DRAINAGE REPORT FOR

EL RANCHO SUBSTATION EL PASO COUNTY, COLORADO

JUNE 2019

Prepared For:

MOUNTAIN VIEW ELECTRIC ASSOCIATION David Waldner

11140 E Woodmen Rd, Peyton, CO 80831 (719) 495-2283

Prepared By:

TERRA NOVA ENGINEERING, INC. 721 S. 23RD STREET

Colorado Springs, CO 80904 (719) 635-6422

TNE Job No. 1909.00 County Job No. COM1920

2


EL RANCHO SUBSTATION EL PASO COUNTY, COLORADO

TABLE OF CONTENTS

Engineer’s Statement Page 3

Purpose Page 4

General Description Page 4

Floodplain Statement Page 5

Existing Drainage Conditions Page 5

Proposed Drainage Conditions Page 6

Hydrologic Calculations Page 8

Drainage Fees Page 8

Summary Page 8

Bibliography Page 9

APPENDICIES

VICINITY MAP

S.C.S. SOILS MAP

FEMA FIRM MAP

HYDROLOGIC CALCULATIONS

DRAINAGE PLAN

06/12/2019 5:03:50 PM

Approvedby Elizabeth NijkampEl Paso County Planning and Community Developmenton behalf of Jennifer Irvine, County Engineer, ECM Administrator

4


EL RANCHO SUBSTATION EL PASO COUTY, COLORADO

PURPOSE The purpose of this Final Drainage Report is to identify and analyze the proposed drainage

patterns, determine proposed runoff quantities, size drainage structures for conveyance of

developed runoff, and present solutions to drainage impacts on-site and off-site resulting from this

development.

GENERAL DESCRIPTION

This Final Drainage Report is an analysis of approximately 0.82 acres of currently developed land

located in the southwest part of El Paso County, approximately 1,500 feet south-southeast of the

south most point on Old Pueblo Road. The entire property is 5.95 acres and the site is located at

the southeast end of the property. This site is currently in use as an electrical substation, and this

development is for an expansion of the existing facility. Specifically, this development is to install

a second transformer and associated structures, expand the substation yard area, relocated the

control building, and expand the yard access road. The site is located in the southeast quarter of

Section 9, Township 17 South, Range 65 West of the 6th Principal Meridian currently within El

Paso County, Colorado. The site is bounded on all sides by undeveloped open space with the I-25

freeway further to the southwest and railroad tracks and Fountain Creek further to the northeast.

The site is in the Crooked Canyon drainage basin (miscellaneous basin), which is not known to

have been studied, and is approximately 650 feet from Fountain Creek (receiving waters).

Soils for this project are delineated by the map in the appendix as 56% Limon clan (47), 0 to 3

percent slopes, and 44% Fort loam (118), 1 to 5 percent slopes, cool. Soils in the study area are

shown as mapped by S.C.S. in the “Soils Survey of El Paso County Area” and contains soils of

Hydrologic Group C.

5

FLOODPLAIN STATEMENT

The entire site is within a Zone A designated F.E.M.A. floodplain, as determined by Flood

Insurance Rate Map No. 08041C1160 G, dated December 7, 2018 (see appendix). No base flood

elevations have been determined for Zone A areas.

EXISTING DRAINAGE CONDITIONS

The site is currently used as an electrical substation, which includes a gravel yard, electrical

structures and lines, a perimeter fence, and a cleared area around the outside of the fence. The site

is accessed by a dirt road coming from the north of the site. The area immediately around the site

is open space with native vegetation. There is a water channel immediately west of the site that

flows south, which has raised banks that largely prevent surface flow into the channel. To the east

of the site are two separate sets of railroad tracks, then Fountain Creek.

The site generally drains to the south and east. There are also two offsite basins that are related to

the site, where runoff flows off the site to the east or to a low area north of the site.

Offsite basin OS-1’s 0.07 acres consists of half dirt road and half open space with native

vegetation. Runoff (Q5=0.1 cfs and Q100=0.3 cfs) sheet flows to the northeast and off the site onto

undeveloped land at Design Point Z.

Offsite basin OS-2’s 0.29 acres consists of undeveloped open space with native vegetation that

flows to a low point (area of ponding). Runoff (Q5=0.1 cfs and Q100=0.8 cfs) sheet flows to the

north and to the low point at Design Point Y. The combined runoff from basins OS-2 and EX-C

at Design Point Y is Q5=0.2 cfs and Q100=1.5 cfs

Basin EX-A’s 0.66 acres consists of the substation yard and is surfaced with gravel. Runoff

(Q5=0.8 cfs and Q100=2.1 cfs) sheet flows to the south and east sides of the site, to Design Point

A.

6

Basin EX-B’s 0.05 acres consists of half dirt road and half open space with native vegetation.

Runoff (Q5=0.0 cfs and Q100=0.2 cfs) sheet flows to the northeast and off the site onto undeveloped

land, to Design Point B.

Basin EX-C’s 0.24 acres consists of half of the dirt road with the remainder being open space with

native vegetation. Runoff (Q5=0.1 cfs and Q100=0.7 cfs) sheet flows to the north onto basin OS-2,

to Design Point C.

Basin EX-D’s 0.13 acres consists of half bare earth (along the fence line) and half open space with

native vegetation. Runoff (Q5=0.1 cfs and Q100=0.3 cfs) sheet flows to the west then channelizes

and flows to the south off the site, to Design Point D.

PROPOSED DRAINAGE CONDITIONS

Runoff in the areas of the substation expansion will largely follow the existing conditions. The

biggest change to runoff will be expanding the area with a gravel surface. Most of the proposed

site will continue draining to the east and south, with the northern section draining to the north.

The proposed site has been broken into four basins and the two offsite basins continue to be related

to site runoff. See appendix for calculations.

Offsite basin OS-1’s 0.07 acres consists of half dirt road and half open space with native

vegetation. Runoff (Q5=0.1 cfs and Q100=0.3 cfs) sheet flows to the northeast and off the site onto

undeveloped land at Design Point Z.

Offsite basin OS-2’s 0.29 acres consists of undeveloped open space with native vegetation that

flows to a low point (area of ponding). Runoff (Q5=0.1 cfs and Q100=0.8 cfs) sheet flows to the

north and to the low point at Design Point X. The combined runoff from basins OS-2 and PR-3 at

Design Point X is Q5=0.4 cfs and Q100=1.7 cfs

Basin PR-1 (0.74 acres; Q5=0.9 cfs and Q100=2.3 cfs) consists of the substation yard and is surfaced

with gravel. Drainage in this basin sheet flows to the east and south sides of the site at Design

Point 1.

7

Basin PR-2 (0.05 acres; Q5=0.1 cfs and Q100=0.3 cfs) consists of three quarters gravel yard and

road and one quarter open space with native vegetation. Drainage in this basin sheet flows to the

east off the site and onto undeveloped open space at Design Point 2.

Basin PR-3 (0.24 acres; Q5=0.3 cfs and Q100=0.9 cfs) consists of two thirds gravel yard and road

with the remainder being open space with native vegetation. Drainage in this basin sheet flows

north into basin OS-2 at Design Point 3.

Basin PR-4 (0.04 acres; Q5=0.0 cfs and Q100=0.1 cfs consists of bare earth (along the fence line)

and native vegetation. Drainage in this basin sheet flows to the west then channelizes and flows

to the south off the site at Design Point 4.

Proposed flows in basins PR-1, PR-2, and PR-3 are slightly higher than existing flows (by 0.1 cfs

or 0.2 cfs at the 100-year event). For basin PR-1, some of this increase is due to an increase in

area. For basin PR-4, the percent impervious is the same as the existing condition, while the area

(and therefore flow) is lower. These flow increases are considered minimal.

No new drainage structures are proposed as part of this development.

In an effort to protect receiving water and as part of the “four-step process to minimize adverse

impacts of urbanization” this site was analyzed in the following manner:

1. Reduce Runoff- The proposed expansion is to be surfaced with gravel, which slows runoff

and allows for infiltration. The site is also surrounded on all sides by natural vegetation

(grass buffers), which reduces and slows runoff.

2. Stabilize Drainageways- Not applicable. There are no drainageways associated with this

site. There is an existing water way to the southwest of the site; however, runoff from the

site cannot enter this water way due to the raised embankment.

3. Provide Water Quality Capture Volume (WQCV)- Water quality is not required for this

site due to the disturbed area (and the entire site) being less than one acre.

4. Consider Need for Industrial and Commercial BMPs- Both the existing and proposed use

8

of the site is an electrical substation. The industrial BMPs currently in use at the site will

continue to be used following this development.


Hydrologic calculations were performed using the El Paso County Storm Drainage Design Criteria

Manual - Volumes 1 & 2, latest editions. The Rational Method was used to estimate storm water

runoff anticipated from design storms with 5-year and 100-year recurrence intervals.

DRAINAGE FEES

The existing site is in the Crooked Canyon Basin. As no platting is associated with this

development, no drainage or bridge fees are due.

SUMMARY

Development of this site will not adversely affect the surrounding developments. Proposed flows,

as detailed in this report, will follow the drainage patterns outlined in this report showing how

runoff will be safely routed downstream. No new drainage facilities are proposed as part of this

site expansion.

PREPARED BY: TERRA NOVA ENGINEERING, INC. Dane Frank, P.E. Project Engineer Jobs/1909.00/Drainage/190900 FDR.doc

9

REFERENCE El Paso County Drainage Criteria Manual-Volumes 1 & 2, latest edition El Paso County Board Resolution No 15-042 (Adoption of Chapter 6 and Section 3.2.1 Chapter 13 of the City of Colorado Springs Drainage Criteria Manual dated May 2014, Hydrology and Full Spectrum Detention) SCS Soils Map for El Paso County Federal Emergency Management Agency (FEMA) flood maps

VICINITY MAP

El Paso County - Community: Property Search

Schedule Number: 5700000062

El Paso County, CO - Community http://community.spatialest.com/co/elpaso/#/Property-Search/5700000062

1 of 2 3/19/2019, 3:17 PM

El Rancho SubstationVicinity Map

SITE

S.C.S. SOILS MAP

Soil Map—El Paso County Area, Colorado(El Rancho Substation)

Natural ResourcesConservation Service

Web Soil SurveyNational Cooperative Soil Survey

3/19/2019Page 1 of 3

4270

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529190 529200 529210 529220 529230 529240 529250 529260 529270 529280

529190 529200 529210 529220 529230 529240 529250 529260 529270 529280

38° 34' 56'' N10

4° 3

9' 5

3'' W

38° 34' 56'' N

104°

39'

49'

' W

38° 34' 52'' N

104°

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' W

38° 34' 52'' N

104°

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' W

N

Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS840 30 60 120 180

Feet0 5 10 20 30

MetersMap Scale: 1:644 if printed on A portrait (8.5" x 11") sheet.

Soil Map may not be valid at this scale.

MAP LEGEND MAP INFORMATION

Area of Interest (AOI)Area of Interest (AOI)

SoilsSoil Map Unit Polygons

Soil Map Unit Lines

Soil Map Unit Points

Special Point FeaturesBlowout

Borrow Pit

Clay Spot

Closed Depression

Gravel Pit

Gravelly Spot

Landfill

Lava Flow

Marsh or swamp

Mine or Quarry

Miscellaneous Water

Perennial Water

Rock Outcrop

Saline Spot

Sandy Spot

Severely Eroded Spot

Sinkhole

Slide or Slip

Sodic Spot

Spoil Area

Stony Spot

Very Stony Spot

Wet Spot

Other

Special Line Features

Water FeaturesStreams and Canals

TransportationRails

Interstate Highways

US Routes

Major Roads

Local Roads

BackgroundAerial Photography

The soil surveys that comprise your AOI were mapped at 1:24,000.

Warning: Soil Map may not be valid at this scale.

Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale.

Please rely on the bar scale on each map sheet for map measurements.

Source of Map: Natural Resources Conservation ServiceWeb Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857)

Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required.

This product is generated from the USDA-NRCS certified data as of the version date(s) listed below.

Soil Survey Area: El Paso County Area, ColoradoSurvey Area Data: Version 16, Sep 10, 2018

Soil map units are labeled (as space allows) for map scales 1:50,000 or larger.

Date(s) aerial images were photographed: Apr 12, 2017—Nov 17, 2017

The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident.

Soil Map—El Paso County Area, Colorado(El Rancho Substation)



3/19/2019Page 2 of 3

Map Unit Legend

Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI

47 Limon clay, 0 to 3 percent slopes

0.6 56.4%

118 Fort loam, 1 to 5 percent slopes, cool

0.5 43.6%

Totals for Area of Interest 1.0 100.0%

Soil Map—El Paso County Area, Colorado El Rancho Substation



3/19/2019Page 3 of 3

El Paso County Area, Colorado

47—Limon clay, 0 to 3 percent slopes

Map Unit SettingNational map unit symbol: 368pElevation: 5,200 to 6,200 feetMean annual precipitation: 12 to 14 inchesMean annual air temperature: 48 to 52 degrees FFrost-free period: 135 to 155 daysFarmland classification: Not prime farmland

Map Unit CompositionLimon, occasionally flooded, and similar soils: 85 percentEstimates are based on observations, descriptions, and transects of

the mapunit.

Description of Limon, Occasionally Flooded

SettingLandform: Flood plains, alluvial fansDown-slope shape: LinearAcross-slope shape: LinearParent material: Clayey alluvium derived from shale

Typical profileA - 0 to 4 inches: clayAC - 4 to 12 inches: silty clayC - 12 to 60 inches: silty clay loam

Properties and qualitiesSlope: 0 to 3 percentDepth to restrictive feature: More than 80 inchesNatural drainage class: Well drainedRunoff class: LowCapacity of the most limiting layer to transmit water (Ksat):

Moderately low to moderately high (0.06 to 0.20 in/hr)Depth to water table: More than 80 inchesFrequency of flooding: OccasionalFrequency of ponding: NoneCalcium carbonate, maximum in profile: 10 percentGypsum, maximum in profile: 2 percentSalinity, maximum in profile: Very slightly saline to moderately

saline (2.0 to 8.0 mmhos/cm)Sodium adsorption ratio, maximum in profile: 10.0Available water storage in profile: High (about 9.9 inches)

Interpretive groupsLand capability classification (irrigated): 3eLand capability classification (nonirrigated): 4eHydrologic Soil Group: CEcological site: Salt Flat LRU's A & B (R069XY033CO)

Map Unit Description: Limon clay, 0 to 3 percent slopes---El Paso County Area, Colorado El Rancho Substation



3/19/2019Page 1 of 2

Hydric soil rating: No

Minor Components

Other soilsPercent of map unit: Hydric soil rating: No

PleasantPercent of map unit: Landform: DepressionsHydric soil rating: Yes

Data Source Information


Map Unit Description: Limon clay, 0 to 3 percent slopes---El Paso County Area, Colorado El Rancho Substation



3/19/2019Page 2 of 2

El Paso County Area, Colorado

118—Fort loam, 1 to 5 percent slopes, cool

Map Unit SettingNational map unit symbol: 2rgqsElevation: 5,500 to 6,500 feetMean annual precipitation: 12 to 14 inchesMean annual air temperature: 48 to 54 degrees FFrost-free period: 125 to 160 daysFarmland classification: Prime farmland if irrigated

Map Unit CompositionFort and similar soils: 85 percentMinor components: 15 percentEstimates are based on observations, descriptions, and transects of

the mapunit.

Description of Fort

SettingLandform: Fans, interfluvesLandform position (two-dimensional): Backslope, footslopeLandform position (three-dimensional): Side slopeDown-slope shape: ConvexAcross-slope shape: LinearParent material: Loamy alluvium and/or eolian deposits

Typical profileA - 0 to 4 inches: loamBt - 4 to 12 inches: clay loamBtk - 12 to 33 inches: clay loamBk1 - 33 to 47 inches: loamBk2 - 47 to 79 inches: sandy loam

Properties and qualitiesSlope: 1 to 5 percentDepth to restrictive feature: More than 80 inchesNatural drainage class: Well drainedRunoff class: LowCapacity of the most limiting layer to transmit water (Ksat):

Moderately high (0.20 to 0.60 in/hr)Depth to water table: More than 80 inchesFrequency of flooding: NoneFrequency of ponding: NoneCalcium carbonate, maximum in profile: 25 percentGypsum, maximum in profile: 2 percentSalinity, maximum in profile: Nonsaline to very slightly saline (0.5

to 2.0 mmhos/cm)Sodium adsorption ratio, maximum in profile: 3.0Available water storage in profile: Moderate (about 8.5 inches)

Map Unit Description: Fort loam, 1 to 5 percent slopes, cool---El Paso County Area, Colorado El Rancho Substation



3/19/2019Page 1 of 2

Interpretive groupsLand capability classification (irrigated): 3eLand capability classification (nonirrigated): 4cHydrologic Soil Group: CEcological site: Loamy Plains, LRU's A & B 10-14 Inches, P.Z.

(R069XY006CO)Forage suitability group: Loamy (G069XW017CO)Other vegetative classification: Loamy Plains #6 (069XY006CO_2)Hydric soil rating: No

Minor Components

WilidPercent of map unit: 10 percentLandform: InterfluvesLandform position (two-dimensional): SummitLandform position (three-dimensional): InterfluveDown-slope shape: LinearAcross-slope shape: LinearEcological site: Loamy Plains, LRU's A & B 10-14 Inches, P.Z.

(R069XY006CO)Other vegetative classification: Loamy Plains #6 (069XY006CO_2)Hydric soil rating: No

OterodryPercent of map unit: 5 percentLandform: HillslopesLandform position (two-dimensional): BackslopeLandform position (three-dimensional): Side slopeDown-slope shape: ConvexAcross-slope shape: LinearEcological site: Sandy Plains LRU's A & B (R069XY026CO)Hydric soil rating: No

Data Source Information


Map Unit Description: Fort loam, 1 to 5 percent slopes, cool---El Paso County Area, Colorado El Rancho Substation



3/19/2019Page 2 of 2

FEMA FIRM MAP

SITE

SITE IN ZONE A 100-YEAR FLOODPLAIN

EL RANCHO SUBSTATION(Runoff Coefficient Source Notes)

BASIN SURFACE(S) % IMPERVIOUS USEDOS-1 Natural vegetation (grasses, shrubs), 1/2 of dirt road 2%OS-2 Natural vegetation (grasses, shrubs), 1/2 of dirt road 2%EX-A 85% gravel yard, 15% gravel access road 45%EX-B Natural vegetation (grasses, shrubs), 1/2 of dirt road 2%EX-C Natural vegetation (grasses, shrubs), 1/2 of dirt road 2%EX-D 1/2 natural vegetation (grasses, shrubs), 1/2 bare earth 2%

BASIN SURFACE(S) % IMPERVIOUS USEDOS-1 Natural vegetation (grasses, shrubs), 1/2 of dirt road 2%OS-2 Natural vegetation (grasses, shrubs), 1/2 of dirt road 2%PR-1 3/4 gravel yard & 1/4 gravel access road 45%PR-2 75% gravel yard, 0% gravel access road, 25% natural veg. 30%PR-3 50% gravel yard, 17% gravel access road, 33% natural veg. 25%PR-4 Bare earth 2%

Calculated by: DLFDate: 6/5/2019

Checked by: LD

Note: 40% impervious applied for gravel yard, 60% for gravel access road

EXISTING CONDITIONS

DEVELOPED CONDITIONS

The DCM calls out an impervious percent of 80 for a gravel surface (under the streets heading), with no other options for gravel surfaces. Gravel surfaces that aren’t streets typically have lower percent impervious values due to the lack of compacted road base below the gravel and regular vehicle traffic. In this particular case, the El Rancho Substation has a gravel surface around the electrical equipment/structures, with part of that gravel surface acting as an access road for maintenance vehicles. There is no compacted road base below the gravel and vehicle traffic will be infrequent.

80% impervious does not accurately represent the type of gravel surface commonly found at electrical substations. A closer fit in DCM Vol 1 Table 6-6 would by the Railroad Yard Areas, which shows 40% impervious. The Urban Storm Drainage Criteria Manual (Vol 1 Table 6-3) also shows a 40% impervious for “Gravel (packed)”.

4:31 PM6/12/201911190900 FDR Calcs

EL RANCHO SUBSTATION(Area Runoff Coefficient Summary)

DEVELOPED UNDEVELOPED WEIGHTED

BASINTOTALAREA AREA C5 C100 AREA C5 C100 C5 C100

(Acres) (Acres) (Acres)

OS-1 0.07 0.00 0.16 0.51 0.07 0.16 0.51 0.16 0.51OS-2 0.29 0.00 0.16 0.51 0.29 0.16 0.51 0.16 0.51EX-A 0.66 0.66 0.37 0.59 0.00 0.16 0.51 0.37 0.59EX-B 0.05 0.00 0.16 0.51 0.05 0.16 0.51 0.16 0.51EX-C 0.24 0.00 0.16 0.51 0.24 0.16 0.51 0.16 0.51EX-D 0.13 0.13 0.16 0.51 0.00 0.16 0.51 0.16 0.51

DEVELOPED UNDEVELOPED WEIGHTED

BASINTOTALAREA AREA C5 C100 AREA C5 C100 C5 C100

(Acres) (Acres) (Acres)

OS-1 0.07 0.00 0.16 0.51 0.07 0.16 0.51 0.16 0.51OS-2 0.29 0.00 0.16 0.51 0.29 0.16 0.51 0.16 0.51PR-1 0.74 0.74 0.37 0.59 0.00 0.16 0.51 0.37 0.59PR-2 0.05 0.05 0.30 0.57 0.00 0.16 0.51 0.30 0.57PR-3 0.24 0.24 0.28 0.56 0.00 0.16 0.51 0.28 0.56PR-4 0.04 0.04 0.16 0.51 0.00 0.16 0.51 0.16 0.51


Checked by: LD

EXISTING CONDITIONS


4:18 PM6/5/201924190900 FDR Calcs

EL RANCHO SUBSTATION AREA DRAINAGE SUMMARY

WEIGHTED OVERLAND STREET / CHANNEL FLOW T t INTENSITY TOTAL FLOWS

BASINAREA

TOTALC5 C100 C5 Length Height TC Length Slope Velocity Tt TOTAL I5 I100 Q5 Q100

(Acres) (ft) (ft) (min) (ft) (%) (fps) (min) (min) (in/hr) (in/hr) (c.f.s.) (c.f.s.)

OS-1 0.07 0.16 0.51 0.16 25 1.0 5.4 0 0.5% 1.1 0.0 5.4 4.9 8.8 0.1 0.3

OS-2 0.29 0.16 0.51 0.16 110 1.0 18.6 0 0.5% 1.1 0.0 18.6 3.2 5.3 0.1 0.8

EX-A 0.66 0.37 0.59 0.37 140 1.0 17.7 0 0.5% 1.1 0.0 17.7 3.2 5.4 0.8 2.1

EX-B 0.05 0.16 0.51 0.16 25 1.5 4.7 0 0.5% 1.1 0.0 4.7 5.1 9.2 0.0 0.2

EX-C 0.24 0.16 0.51 0.16 80 1.0 14.3 0 0.5% 1.1 0.0 14.3 3.5 6.0 0.1 0.7

EX-D 0.13 0.16 0.51 0.16 140 0.8 24.5 0 0.5% 1.1 0.0 24.5 2.8 4.6 0.1 0.3

WEIGHTED OVERLAND STREET / CHANNEL FLOW T t INTENSITY TOTAL FLOWS

BASINAREA

TOTALC5 C100 C5 Length Height TC Length Slope Velocity Tt TOTAL I5 I100 Q5 Q100

(Acres) (ft) (ft) (min) (ft) (%) (fps) (min) (min) (in/hr) (in/hr) (c.f.s.) (c.f.s.)

OS-1 0.07 0.16 0.51 0.16 25 1.0 5.4 0 0.5% 1.1 0.0 5.4 4.9 8.8 0.1 0.3

OS-2 0.29 0.16 0.51 0.16 110 1.0 18.6 0 0.5% 1.1 0.0 18.6 3.2 5.3 0.1 0.8

PR-1 0.74 0.37 0.59 0.37 150 1.0 18.7 0 0.5% 1.1 0.0 18.7 3.1 5.3 0.9 2.3

PR-2 0.05 0.30 0.57 0.30 25 1.5 4.0 0 0.5% 1.1 0.0 4.0 5.3 9.6 0.1 0.3

PR-3 0.24 0.28 0.56 0.28 80 1.0 12.5 0 0.5% 1.1 0.0 12.5 3.7 6.4 0.3 0.9

PR-4 0.04 0.16 0.51 0.16 140 0.8 24.5 0 0.5% 1.1 0.0 24.5 2.8 4.6 0.0 0.1

Calculated by: DLF

Date: 6/5/2019Checked by: LD

* For Calcs See Runoff Summary

* For Calcs See Runoff Summary

EXISTING CONDITIONS


4:18 PM6/5/201934190900 FDR Calcs

EL RANCHO SUBSTATIONPROPOSED SURFACE ROUTING SUMMARY

Flow

DesignPoint(s)

ContributingBasins

AreaAc

Q 5 Q 100

Z OS-1 0.07 0.1 0.3

Y OS-2, EX-C 0.53 0.2 1.5

X OS-2, PR-3 0.53 0.4 1.7

A EX-A 0.66 0.8 2.1

B EX-B 0.05 0.0 0.2

C EX-C 0.24 0.1 0.7

D EX-D 0.13 0.1 0.3

1 PR-1 0.74 0.9 2.3

2 PR-2 0.05 0.1 0.3

3 PR-3 0.24 0.3 0.9

4 PR-4 0.04 0.0 0.1


Checked by: LD

4:18 PM6/5/201944190900 FDR Calcs

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),1$/ '5$,1$( 5(3257 )25 (/ 5$1&+2 68%67$7,21 (/ 3$62 &2817< … · 2019-06-12 · ),1$/ '5$,1$(...

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Transcript of ),1$/ '5$,1$( 5(3257 )25 (/ 5$1&+2 68%67$7,21 (/ 3$62 &2817< … · 2019-06-12 · ),1$/ '5$,1$(...

),1$/ '5$,1$*( 5(3257 )25 (/ 5$1&+2 68%67$7,21 (/ 3$62 &2817< … · 2019-06-12 · ),1$/ '5$,1$*(...

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Transcript of ),1$/ '5$,1$*( 5(3257 )25 (/ 5$1&+2 68%67$7,21 (/ 3$62 &2817< … · 2019-06-12 · ),1$/ '5$,1$*(...

),1$/ '5$,1$( 5(3257 )25 (/ 5$1&+2 68%67$7,21 (/ 3$62 &2817< … · 2019-06-12 · ),1$/ '5$,1$(...

Transcript of ),1$/ '5$,1$( 5(3257 )25 (/ 5$1&+2 68%67$7,21 (/ 3$62 &2817< … · 2019-06-12 · ),1$/ '5$,1$(...