LOWER ENTIAT RIVER BACKWATER HYRAULIC PROFILE EVALUATION … · Entiat Backwater Evaluation Rocky...

LOWER ENTIAT RIVER BACKWATERHYRAULIC PROFILE EVALUATION

FIRST DRAFT

ROCKY REACH HYDROELECTRIC PROJECTFERC Project No. 2145

May 11, 2001

Public Utility District No. 1 of Chelan CountyWenatchee, Washington

Entiat Backwater Evaluation

First Draft Study Report Rocky Reach Project No. 2145May 11, 2001 Page i SS/2913

TABLE OF CONTENTS

SUMMARY ......................................................................................................................1

INTRODUCTION.............................................................................................................3

SECTION 1: STUDY AREA ............................................................................................5

SECTION 2: PREVIOUS HYDRAULIC STUDIES ..........................................................5

SECTION 3: MODEL SELECTION.................................................................................5

SECTION 4: HYDROLOGY ............................................................................................6

SECTION 5: MODEL SETUP AND CALIBRATION .......................................................65.1 Cross-sectional Data ...................................................................................................................................... 65.2 Model Input ................................................................................................................................................... 65.3 Manning's n ................................................................................................................................................... 75.4 Model Calibration.......................................................................................................................................... 8

SECTION 6: BACKWATER CURVE ANALYSIS............................................................96.1 Influence of Lake Level................................................................................................................................. 96.2 Influence of Sediment Accretion at the Mouth of the Entiat River.............................................................. 106.3 Influence of River Ice Accumulations at the Mouth of the Entiat River...................................................... 10

SECTION 7: CONCLUSIONS.......................................................................................10

APPENDICES

APPENDIX A: MAPS OF STUDY AREA AND SURVEYED SECTIONS

APPENDIX B: MODEL SETUP PLAN AND RESULTS PROFILES

APPENDIX C: TABULATED MODEL RESULTS


Rocky Reach Project No. 2145 First Draft Study ReportSS/2913 Page ii May 11, 2001

LIST OF TABLES

Table 5-1: Model Calibration Parameters ..................................................................................................................... 8Table 5-2: Model Calibration Result Comparison with Observed Water Surface ........................................................ 9Table 6-1: Model Results, backwater limits.................................................................................................................. 9


First Draft Study Report Rocky Reach Project No. 2145May 11, 2001 Page 1 SS/2913

SUMMARY

The Entiat River joins the Columbia River at Columbia River mile 484, about 18 miles north ofthe city of Wenatchee, Washington, and roughly 10 miles upstream of Rocky Reach Dam. Thisstretch of the Columbia River, between Rocky Reach Dam and Wells Dam farther upstream, iscalled Lake Entiat.

A one-dimensional, computational hydraulic model of the lower Entiat River and confluence ofthe Entiat River with the Columbia River was developed to evaluate effects of Lake Entiat watersurface elevations and other factors on the Entiat River water surface profile. The study reachbegins several thousand feet upriver from Entiat River Mile (RM) 0.0 and extends severalhundred feet into Lake Entiat.

The study reach’s lower boundary was chosen to coincide with a location where the river’s deltatransitions from the relatively shallow “sandy bar” at the mouth of the Entiat River (Entiat RiverDelta) to much deeper portions of Lake Entiat. Consequently, the lake is the model’s lowerboundary condition even at the lowest allowable reservoir elevations. The upper limits of thestudy reach were chosen to extend upstream of any anticipated effects Lake Entiat may haveupon river stages. Maps of the study area are included in Appendix A.

The hydraulic model shows that the lake influences the water surface profile of the lower riverfor river flows up to and including the 25-year flood and Lake Entiat reservoir elevations of 707feet or lower. At a lake elevation of 707 feet (normal maximum water level at Rocky ReachDam), the backwater effect extends 3,500 feet upstream of RM 0.0 at an Entiat River dischargeof 1,334 cfs (25-year flood) and 3,400 feet upstream of RM 0.0 at a river discharge of 281 cfs(normal low flow). The model was also used to evaluate the effects of high Columbia Riverdischarge and conditions other than lake levels (e.g. sediment accumulation at the Entiat Riverdelta) on the lower Entiat River backwater profile.

The study area is characterized by moderate river channel gradient (compared to steeper gradientsin reaches upstream of the study area), by encroachment of an existing highway bridge structure,and by accretion of sediments at the confluence of the Entiat River and Lake Entiat.Encroachment of the highway bridge structure into the Entiat River’s historic river channelmoderately affects backwater profiles. Accumulation of sediment in the lower river’s historiccorridor has a more pronounced effect in raising and extending the backwater hydraulic profile.



INTRODUCTION

Lake Entiat was formed in the early 1960s when the Columbia River water surface was raised asa result of the construction of Rocky Reach Dam. The dam increased the lake’s high waterelevation to 707 feet msl at the dam. Since completion of the dam in 1962, the project’soperating license requires Chelan County Public Utility District No. 1 of Wenatchee,Washington, (Chelan PUD) to maintain the water surface at Rocky Reach Dam above elevation704 feet (msl) and below 707 feet. The Rocky Reach license provides for an exception to thisrule; the exception requires the District to occasionally raise the water surface to 710 feet tocontrol flooding if so ordered by the Army Corps of Engineers.

Lake Entiat water level affects the hydraulic profile of the lower Entiat River, raising thehydraulic profile above the pre-project level for some distance upstream of the river’s confluencewith the lake. The height of this backwater effect depends upon a number of factors, includingthe lake elevation, the discharge rate of both the Columbia and Entiat Rivers, constriction of thelower river resulting from sediment accretion at the confluence of the two rivers and, to a lesserextent, influences of a highway bridge.

To evaluate characteristics of the lower river’s hydraulic profile, Chelan PUD developed a one-dimensional hydraulic model of the lower river. The river profile was evaluated for two EntiatRiver discharges. The effect of sediment accumulation at the mouth of the Entiat River was alsoevaluated. The Lake Entiat water levels chosen for evaluation range from the lowest license-allowed pool to the highest license-allowed pool, taking into account the effect Columbia Riverdischarge rates have on the water surface profile within Lake Entiat. The Entiat river dischargerates chosen for evaluation range from a normal annual low discharge to the 25-year recurrenceinterval discharge. Discharge rates for each of these two events were obtained from an analysisperformed by Bovay Engineers for Chelan PUD in 1991. The Bovay report predicted EntiatRiver discharge rates based on 25 years of USGS gage data collected from the Ardenvoir gagingstation and from a HEC-1 hydrology study of the Entiat River drainage basin.



SECTION 1: STUDY AREA

The study area, shown in Appendix A, extends from a point approximately 600 feet downstreamof the confluence of the Entiat and Columbia Rivers to approximately 5,600 feet upstream of theconfluence near the Keystone Ranch bridge. The lower limit of the study area is fartherdownstream than the point where the Entiat River intersects Lake Entiat at its lowest allowablewater surface elevation. The upper limit extends farther up the Entiat River than the effects ofthe lake.

The river slope averages about 24 feet per mile within the study area and about 37 feet per milebetween the study area and Ardenvoir. The river bed materials consist primarily of gravels andcobbles in the upper study area and primarily sand and silt in the lower study area.

Since channelization of the river by the U.S. Army Corps of Engineers, the Entiat River hashistorically traversed a very straight corridor within the study area, with a notable absence of anysignificant flood plain within the study area. Other than modest ponding areas immediatelyupstream of the highway bridge, near the mouth of the river, the river alignment remainsrelatively free of notable channel changes and lateral movement.

SECTION 2: PREVIOUS HYDRAULIC STUDIES

At least one previous hydraulic study has been performed in the study reach, the Entiat RiverHydrologic and Sedimentation Study, performed for Chelan PUD by Bovay Northwest, datedJune 1992. The Bovay study predicted the backwater profile of the lower Entiat River for the 25-year recurrence interval flood event and estimated the effects surface ice cover may have on thebackwater profile.

SECTION 3: MODEL SELECTION

A one-dimensional, computational hydraulic model (HEC-RAS, Corps of Engineers, 1998)running in the graphical pre- and post-processing environment (Corps of Engineers, 1998) wasselected for this evaluation a variety of reasons. The program is widely used and accepted and issupported by the Corps of Engineers. Also, two-dimensional effects were not consideredpredominant in the study reach to an extent warranting the use of a more detailed, input-dataintensive computational routine. Finally, the model is similar to the models used by previousinvestigators.


Rocky Reach Project No. 2145 First Draft Study ReportSS/2913 Page 6 May 11, 2001

SECTION 4: HYDROLOGY

The Entiat River's hydrology is controlled primarily by snowmelt and glacial runoff. Since 1957,stream flows have been recorded at Entiat River mile 18, approximately six miles northwest ofArdenvoir, just upstream of the confluence of the Entiat and Mad rivers. The Bovay reportidentified the 25-year flood flow at the Ardenvoir gage as 516 cfs and used rainfall modeling andbase flow estimates to predict a 25-year flood flow of 1,334 cfs at the mouth of the Entiat River.The average recorded or “normal” Entiat River flow for January at the confluence with theColumbia River was reported as 281 cfs.

SECTION 5: MODEL SETUP AND CALIBRATION

The model was set up to simulate the predominant existing characteristics of the lower EntiatRiver during the period of hydrographic surveys. Water level elevations were recorded duringthe surveys and used for model calibration. The calibration was compared to the Bovay reportfor confirmation of accuracy.

5.1 Cross-sectional DataThe model setup started with surveying of cross sections of the lower river and confluence of theriver with Lake Entiat. A traverse with a high order of accuracy was established generallyparallel to and proximate to the Entiat River Road between Lake Entiat and the upper end of thestudy reach. The traverse was used to locate cross sections both horizontally and vertically.River cross sections were obtained with standard survey methods in locations where the riverwater level was low enough to allow wading. River cross sections at deeper portions of the riverwere obtained with hydrographic survey methods, performed from a boat, with the boat locationmonitored from on-shore control.

Lake Entiat cross sections in areas covered by water were obtained with soundings performedfrom a boat, with the boat location monitored from on-shore control. Lake Entiat cross sectionswere performed by standard survey methods in locations where water depths allowed wading.During the cross section data collection, both river and lake level elevations were recordedregularly.

Twelve cross sections were surveyed within the Entiat River and Columbia River confluencearea, and 30 river cross sections were surveyed. Cross section locations were established tocoincide with existing bridge structures, gravel bars and/or islands, and abrupt changes in rivercharacter. Confluence cross sections were obtained at regular intervals throughout and beyondlocations where the confluence contains sediment deposits. Cross section location, spacing andorientation are shown on the study reach map included in Appendix A.

5.2 Model InputOnce the surveyed cross sections were placed into the model, several additional cross sectionswere created using the HEC-RAS cross section interpolation routine. Interpolated sections were



created with density sufficient to eliminate warning/error messages from the model resultingfrom conveyance and energy changes, which exceeded standard limits. Interpolated sectionswere plotted and reviewed for discrepancies between the observed and interpolated groundsurfaces. The river system model setup including locations of surveyed and interpolated crosssections is shown in Appendix B.

The model setup includes two bridge structures, which exist at the outlet of the river andbeginning of the confluence of the Entiat River with the Columbia River.

5.3 Manning's nThe primary river channel is modeled with a Manning's n value of 0.025. This is based onliterature-reported values and similar, but somewhat lower, values used in the Bovay report.Slightly higher Manning's n values are used in this study than in the Bovay study becauseriverbed-induced turbulence was observed during field data collection to an extent consistentwith literature-recommended roughness values and because the slightly higher roughness valuesproduced a calibration more consistent with observed water levels.

Manning's n values for overbank areas were selected based on the extent to which upland areaswere observed, by virtue of debris evidence, to convey limited channelized and overland flow.Fine, fresh fluvial deposits were observed within established, historic side channels and heavilyvegetated margins of the main river channel. These areas were assigned a Manning's n valueranging from 0.05 to 0.06 depending on the density of vegetation.

Manning's n values were also assigned to upland, vegetated areas of islands and gravel barswhere fluvial deposition was observed. Areas between existing side channels containedremnants of organic fluvial depositions. This indicates the side channels and higher islandelevations conveyed a stream discharge during flood events which was mitigated by channel inletblockage and island foliage. Consequently, the side channels and island margins and low-lyingoverland areas were assigned a Manning's n value higher than the main channel but low enoughto allow for flow conveyance during higher flow events. Trial values of Manning’s n for heavilyvegetated channel margins and island areas low enough to be wetted during high flow eventswere selected and the model calibration “best fit” was chosen as an n = 0.35.

Manning's n values were varied laterally over each cross section, with generally one valueassigned to the main stream channel and separate values assigned to the low lying island areasand river overbank areas. Roughness height values for the thalweg and stream channel (non-overbank areas of conveyance) were initially selected based on Strickler, as described by Chow4.Strickler’s roughness height “as a measure of channel roughness is more sensitive thanManning’s n. Consequently, the effect of errors involved in estimating the roughness height forthe determination of Manning’s n…is comparatively small.5” Strickler’s roughness height for“Streams in Northwestern U.S.” varies from 0.06 to 0.08. An initial value of 0.06 was chosenand other values were tested for sensitivity. Ultimately, calibration was achieved with aroughness height of 0.06 for the non-overbank portions of the flow conveyance lateral limits. 4 VT Chow. 1959. Open Channel Hydraulics, Fig. 8-9 McGraw-Hill, New York, NY5 VT Chow. 1959. Open Channel Hydraulics, Pg 206, McGraw-Hill, New York, NY



5.4 Model CalibrationOnce model setup and initial sensitivity runs were complete, the model was calibrated againstgaged discharge events. Columbia River discharge levels were also adjusted as an antecedentcondition to set lower Entiat River water level conditions. Columbia River discharge rates wereobtained from gage records at Rocky Reach Dam for the dates and times specific water surfaceelevations within the Entiat River were recorded. Calibration stations were chosen to coincidewith the study data collection dates and times. During data collection, the dates, times and watersurface elevations at each cross section were noted. The dates and times were used to select riverdischarge from the Ardenvoir gaging station and compare with the observed river water surfaceelevations noted during the data collection for specific cross sections. The model was calibratediteratively by adjusting Manning’s n and the Entiat and Columbia River discharge rates. TheEntiat River discharge rates used in the model runs were dependent upon the discharge at thegaging station during the same day and time the cross section data was collected. Calibrationparameters were set by comparing the model-predicted water surface elevations to the observedelevations.

Once the observed and modeled water surface elevations matched within a few tenths of a footelevation, a verification run was made without changing the calibration parameters. Theverification run used the Bovay-predicted 25-year flood discharge. The verification run modelwater surface elevations were compared to the Bovay-predicted lower river backwater profile forshape, consistency and general fit. The modeled and observed water surface elevations for theverification simulations matched relatively closely. Table 5-1 shows the final calibrationparameters. Table 5-2 compares the model results with field observations.

Table 5-1: Model Calibration Parameters

Material Manning's n RoughnessCoefficient

Channel (thalweg of main river channel throughoutLower Reach and Confluence area)

0.025

Lightly vegetated mid-channel bar or island 0.06Sparsely vegetated river margin 0.05Heavily vegetated overbank margin 0.06Highly obstructed overbank conveyance 0.1



Table 5-2: Model Calibration Result Comparison with Observed Water Surface

Cross SectionNumber*

Modeled WS Elev Observed WSElevation

Entiat R. gaged discharge

15+0011+0031+0035+0039+00

707.0707.3707.53707.5707.5

707.4707.28707.6707.54707.2

570 cfs reach flow514 cfs reach flow681 cfs reach flow677 cfs reach flow618 cfs reach flow

* Sections for calibration were chosen based on the location of available surveyed elevations, EntiatRiver discharge and observed water surface elevations, and observed Rocky Reach headwater andColumbia River discharge.

SECTION 6: BACKWATER CURVE ANALYSIS

Two initial Entiat River discharge rates were modeled at two Lake Entiat elevations to analyzethe effect the lake levels have on the river’s backwater hydraulics. The Lake Entiat water surfaceelevations selected for analysis are the normal Rocky Reach headwater elevation of 707 feetabove mean sea level and the low normal Rocky Reach headwater elevation of 704 feet msl. Theresults are summarized in Table 6-1. Profiles of the results are included in Appendix B, and themodel output from each simulation is tabulated in Appendix C.

Table 6-1: Model Results, Backwater LimitsRecurrence

IntervalDischarge

(cfs)Lake Entiat water surface

elevation at Entiatconfluence

Distance Upstream of RM 0.0where Lake Entiat pool effect on Entiat River

backwater hydraulic profile elevation is < 0.1 ft.

25 years 1,332 707.3 Model Station 43+00 = 3,500 feet upstream of RM 0.0

Annual lowflow

281 707.3 Model Station 41+97 = 3,397 feet upstream of RM 0.0

25 years 1,332 704.1 Model Station 17+00 = 900 feet upstream of RM 0.0

Annual lowflow

281 704.1 Model Station 38+00 = 3,000 feet upstream of RM 0.0

6.1 Influence of Lake LevelAt a lake elevation of 707.3 feet msl (normal maximum lake level at the Entiat River confluencewith a Columbia River discharge of 220,000 cfs), the lake raises the lower Entiat River's watersurface profile for a distance varying from 3,500 feet upstream of RM 0.0 for the 25-yearrecurrence interval flood, to 3,397 feet upstream of RM 0.0 for the average annual low flow. Ata lake elevation of 704 feet msl (normal minimum lake level at the Entiat River confluence witha Columbia River discharge of 220,000 cfs), the lake raises the lower Entiat River’s water



surface profile for a distance varying from 900 feet upstream of RM 0.0 for the 25-yearrecurrence interval flood, to 3,000 feet upstream of RM 0.0 for the average annual low flow.

6.2 Influence of Sediment Accretion at the Mouth of the Entiat RiverThe lower river contains a significant sediment accumulation at its confluence with the ColumbiaRiver. The accretion of sediment was likely encouraged by backwater effects from Lake Entiat,in conjunction with high sediment loads in the river resulting primarily from forest fire-inducederosion. Although the sediment accumulation is significant in terms of volume, its influence onbackwater is limited. The hydraulic model was manipulated to analyze the effects the sedimentmay have on backwater profiles. As indicated in the backwater curve plots, removal (in themodel) of the sediment accumulation downstream of the existing highway bridge (near river mile0.0) and upstream of the bridge for a distance of approximately 1,600 feet resulted in negligibleeffects on the backwater profile of the river.

6.3 Influence of River Ice Accumulations at the Mouth of the Entiat RiverThe Bovay report investigated the effects of ice accumulations within the lower Entiat River, andthat effort was consequently not repeated as a part of this study.

SECTION 7: CONCLUSIONS

The lower Entiat River is a relatively uncomplicated fluvial system containing minor sidechannels, only some of which are partially obstructed. The river reach is relatively straight andcharacterized by a dearth of flood plain area. The existing highway and railroad bridges do notappear to significantly affect the river’s hydraulic characteristics. The most significant effect onthe river’s backwater profile is produced by Lake Entiat. The one-dimensional model of thelower Entiat River and its confluence with Lake Entiat was developed to estimate rivercharacteristics and effects the lake may have upon the river. The model produces results thatmatch the actual river system very closely for the range of discharge events observed. In general,the model shows that:

• Lake Entiat does produce a backwater effect on the river.• The extent of the backwater effect varies with river flow and lake elevation.• At higher lake levels, the backwater effect extends farther upstream than it does at lower lake

levels.• At higher river flows, the backwater effect extends slightly farther up the river than for lesser

river flows.• At lake elevations equal to and less than 707 feet msl (normal maximum lake level at the

confluence of the Entiat and Columbia Rivers) for river flows up to and including the 25-yearflood, the backwater effect of the lake ends within areas covered by special projecteasements.

• As noted in the Bovay report, accumulations of ice within the lower river can raise the watersurface profile of the river above the profile that would result without ice.


APPENDIX A: MAPS OF STUDY AREA AND SURVEYED SECTIONS


Map of Entiat River Basin and Study Area


APPENDIX B: MODEL SETUP PLAN AND RESULTS PROFILES

Model set-up schematic



APPENDIX C: TABULATED MODEL RESULTS

Cases modeled:• Current geometry, 25-year flow• Current geometry, annual low flow• Current geometry, annual low flow, Lake Entiat at 704• Sediment modification to station 7+00, 25-year flow, Lake Entiat 707.3• Sediment modification to station 7+00, annual low flow, Lake Entiat at 707.3• Sediment modification to station 33+00, 25-year flow• Sediment modification to station 33+00, annual low flow• Annual low flow, sediment accumulation removed

Interpolated sections are denoted by an asterisk (*)


HEC-RAS Plan: Current geometry, 25-yr flow04/27/2001

River Sta Q Total(cfs)

Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

7650 1334 730.60 734.75 734.98 0.001279 3.84 354.65 116.89 0.387497 1334 730.60 733.58 733.58 734.50 0.009618 7.71 174.24 97.89 1.01

7417.66* 1334 729.78 732.47 732.47 733.35 0.012543 7.52 177.95 104.88 1.017338.33* 1334 728.96 731.45 731.45 732.27 0.009865 7.30 183.18 112.54 1.00

7259.* 1334 728.13 730.46 730.46 731.25 0.009957 7.17 186.30 119.71 1.017179.66* 1334 727.31 729.52 729.52 730.28 0.010911 6.98 191.37 128.04 1.007100.33* 1334 726.49 728.63 728.62 729.34 0.011111 6.80 196.50 138.91 1.007020.99* 1334 725.67 727.74 727.74 728.43 0.011670 6.69 199.63 147.68 1.016941.66* 1334 724.84 726.87 726.87 727.56 0.009502 6.69 199.84 146.83 1.016862.33* 1334 724.02 726.02 726.02 726.73 0.008277 6.76 197.58 141.63 1.01

6783 1334 723.20 725.22 725.22 725.94 0.007780 6.83 195.71 137.93 1.016770 1334 723.15 724.80 724.80 725.48 0.008415 6.60 202.17 152.13 1.01

6711.79* 1334 721.66 723.65 723.65 724.37 0.008175 6.82 195.70 136.84 1.006653.59* 1334 720.17 722.46 722.46 723.26 0.007932 7.19 185.59 117.11 1.016595.39* 1334 718.68 721.27 721.27 722.18 0.007657 7.65 174.35 97.41 1.016537.19* 1334 717.19 720.09 720.09 721.14 0.007285 8.22 162.24 78.12 1.01

6479 1334 715.70 719.16 720.21 0.005440 8.21 162.42 62.33 0.906406.14* 1334 715.30 718.75 719.80 0.005674 8.24 161.97 64.05 0.916333.28* 1334 714.90 718.31 718.19 719.38 0.006091 8.31 160.54 66.23 0.946260.42* 1334 714.50 717.84 717.76 718.92 0.006409 8.35 159.72 67.98 0.966187.57* 1334 714.10 717.37 717.30 718.45 0.006609 8.35 159.67 69.50 0.976114.71* 1334 713.70 716.85 716.84 717.96 0.006966 8.42 158.37 70.80 0.996041.85* 1334 713.30 716.34 716.34 717.44 0.007128 8.42 158.46 72.02 1.00

5969 1334 712.90 715.80 715.80 716.91 0.007292 8.43 158.34 72.98 1.015895.33* 1334 712.18 715.24 715.24 716.33 0.007138 8.39 159.08 72.89 1.005821.67* 1334 711.46 714.63 714.63 715.74 0.007256 8.46 157.74 72.39 1.015748.01* 1334 710.74 714.03 714.03 715.15 0.007167 8.47 157.47 71.48 1.015674.35* 1334 710.02 713.35 713.35 714.52 0.007129 8.66 153.96 67.21 1.015600.69 1334 709.30 712.65 712.65 713.85 0.007046 8.80 151.62 64.01 1.01

5527.27* 1334 708.96 712.05 712.05 713.15 0.007212 8.43 158.24 72.82 1.015453.86* 1334 708.61 711.47 711.47 712.49 0.007409 8.10 164.60 82.20 1.015380.46* 1334 708.27 711.19 711.91 0.005092 6.79 196.35 96.24 0.845307.04* 1334 707.92 711.16 711.57 0.002370 5.09 262.05 114.86 0.59




Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

5233.63* 1334 707.58 711.17 711.40 0.001111 3.85 347.15 132.06 0.425160.22* 1334 707.23 711.18 711.32 0.000553 3.01 446.58 146.82 0.305086.81* 1334 706.89 711.18 711.27 0.000299 2.42 565.42 169.93 0.225013.40* 1334 706.54 711.19 711.25 0.000171 1.98 704.08 185.01 0.17

4940 1334 706.20 711.19 711.23 0.000103 1.65 854.95 227.09 0.144903.25* 1334 706.35 711.14 711.22 0.000666 2.25 611.04 223.02 0.224866.51 1334 706.50 710.70 711.14 0.002457 5.34 252.46 121.12 0.64

4803.25* 1334 706.22 710.50 710.85 0.006513 4.74 284.27 135.99 0.574740.00* 1334 705.93 710.03 710.38 0.007037 4.71 285.39 152.22 0.604676.75* 1334 705.65 709.52 709.85 0.007848 4.62 290.89 181.64 0.644613.50* 1334 705.37 708.55 709.12 0.013763 6.03 221.98 167.16 0.914550.25* 1334 705.08 708.26 708.53 0.004353 3.89 325.33 216.02 0.56

4487 1334 704.60 708.25 707.29 708.38 0.000793 1.92 547.33 269.88 0.244390.25* 1334 704.00 708.15 707.33 708.28 0.001262 3.11 501.67 241.80 0.374293.5* 1334 703.40 707.58 707.13 708.02 0.003777 5.37 259.12 229.21 0.70

4196.75* 1334 702.80 707.21 706.48 707.66 0.002787 5.36 251.50 178.36 0.624100 1334 702.20 707.09 705.87 707.40 0.001354 4.44 302.62 178.62 0.474000 1334 702.15 707.22 704.97 707.28 0.000223 1.98 679.10 202.59 0.193900 1334 702.70 707.21 704.98 707.26 0.000146 1.65 776.92 207.60 0.153800 1334 703.10 707.19 705.47 707.24 0.000247 1.92 734.03 256.45 0.203700 1334 701.40 707.17 704.57 707.21 0.000147 1.54 905.84 285.32 0.153500 1334 699.30 707.16 707.19 0.000088 1.30 1059.53 329.72 0.123300 1334 699.00 707.13 707.17 0.000071 1.56 942.63 244.78 0.123100 1334 693.00 707.13 707.16 0.000030 1.34 996.26 165.82 0.092900 1334 694.30 707.13 707.15 0.000022 1.07 1279.02 279.67 0.072700 1334 698.70 707.13 707.15 0.000035 1.13 1214.31 251.56 0.082500 1334 700.00 707.12 707.14 0.000046 1.20 1119.55 224.30 0.092295 1334 701.50 707.11 707.13 0.000050 1.12 1187.14 270.76 0.09

2201.69 1334 700.30 707.10 707.12 0.000059 1.16 1145.06 274.99 0.102100 1334 696.20 707.08 707.10 0.000064 1.24 1150.22 283.47 0.101900 1334 700.00 707.07 707.09 0.000057 1.19 1176.33 330.71 0.101700 1334 700.20 707.05 707.08 0.000088 1.35 1067.21 365.90 0.121500 1334 699.00 707.02 702.84 707.06 0.000170 1.62 873.36 426.47 0.16




Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

1400 1334 699.60 707.02 702.34 707.04 0.000062 1.27 1167.52 508.30 0.111300 1334 701.00 707.01 702.67 707.04 0.000051 1.27 1314.95 551.68 0.101200 1334 699.00 707.01 702.78 707.03 0.000045 1.06 1331.59 590.59 0.091100 1334 697.50 707.01 702.28 707.02 0.000035 0.97 1466.35 632.00 0.081000 1334 695.80 707.01 699.25 707.02 0.000017 0.79 1679.83 287.12 0.06861 Bridge

723.28 1334 695.80 707.01 699.26 707.02 0.000017 0.79 1678.64 287.10 0.06675 1334 698.80 707.01 701.45 707.02 0.000017 0.68 1979.61 791.89 0.06625 1334 701.00 707.01 703.02 707.01 0.000018 0.66 2060.31 995.81 0.06575 1334 700.30 707.01 702.97 707.01 0.000016 0.63 2127.81 997.31 0.05525 1334 700.80 707.01 703.29 707.01 0.000016 0.61 2154.98 997.31 0.05475 1334 701.90 707.00 703.58 707.01 0.000023 0.70 1902.37 997.50 0.06425 1334 702.30 707.01 692.41 707.01 0.000005 0.30 2924.47 997.50 0.03375 1334 703.00 707.00 702.52 707.01 0.000017 0.53 2062.30 998.79 0.05325 1334 698.60 707.00 694.04 707.01 0.000007 0.35 2408.59 998.64 0.03275 1334 703.00 707.00 690.26 707.01 0.000006 0.33 2360.51 999.18 0.03225 1334 701.00 706.99 699.42 707.01 0.000018 0.65 1527.17 998.02 0.06175 1334 699.00 707.00 691.02 707.00 0.000000 0.01 27174.26 998.49 0.00125 1334 690.00 707.00 686.02 707.00 0.000000 0.02 32947.73 998.52 0.00


HEC-RAS Plan: Current geometry, annual low flow04/24/2001


Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G.Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

7650 281 730.60 732.91 732.97 0.000987 1.91 147.08 108.18 0.297497 281 730.60 732.15 732.15 732.57 0.012046 5.20 54.01 65.45 1.01

7417.66* 281 729.78 731.16 731.51 0.013054 4.78 58.74 71.83 0.937338.33* 281 728.96 730.15 730.15 730.53 0.011964 4.93 57.03 76.99 1.01

7259.* 281 728.13 729.28 729.25 729.60 0.010839 4.56 61.68 88.51 0.967179.66* 281 727.31 728.45 728.72 0.010983 4.19 67.06 96.80 0.897100.33* 281 726.49 727.57 727.84 0.011364 4.19 67.02 97.12 0.897020.99* 281 725.67 726.71 726.97 0.010595 4.11 68.41 99.63 0.876941.66* 281 724.84 725.78 725.77 726.09 0.011535 4.46 63.06 98.46 0.986862.33* 281 724.02 724.95 724.91 725.23 0.010041 4.31 65.26 100.95 0.94

6783 281 723.20 724.10 724.10 724.42 0.010398 4.55 61.76 97.94 1.016770 281 723.15 723.87 723.87 724.13 0.011622 4.13 67.97 131.09 1.01

6711.79* 281 721.66 722.62 722.62 722.91 0.011378 4.30 65.30 116.73 1.016653.59* 281 720.17 721.29 721.29 721.63 0.010790 4.66 60.25 91.71 1.016595.39* 281 718.68 719.95 719.95 720.33 0.010407 4.95 56.82 77.09 1.026537.19* 281 717.19 718.60 718.60 719.02 0.009994 5.23 53.74 65.02 1.01

6479 281 715.70 717.46 717.78 0.004957 4.51 62.34 55.54 0.756406.14* 281 715.30 717.08 717.40 0.005232 4.57 61.46 55.86 0.776333.28* 281 714.90 716.67 717.01 0.005506 4.66 60.27 55.27 0.796260.42* 281 714.50 716.26 716.60 0.005702 4.69 59.91 55.89 0.806187.57* 281 714.10 715.84 716.18 0.005896 4.68 60.10 57.77 0.816114.71* 281 713.70 715.39 715.73 0.006476 4.70 59.76 61.11 0.846041.85* 281 713.30 714.92 715.25 0.006523 4.59 61.16 65.07 0.84

5969 281 712.90 714.39 714.74 0.007492 4.73 59.40 67.01 0.895895.33* 281 712.18 713.77 714.15 0.008360 4.94 56.87 65.41 0.935821.67* 281 711.46 713.07 713.05 713.51 0.009018 5.30 52.99 58.03 0.985748.01* 281 710.74 712.34 712.34 712.82 0.009584 5.55 50.60 54.13 1.015674.35* 281 710.02 711.60 711.60 712.10 0.009459 5.67 49.55 50.83 1.015600.69 281 709.30 710.97 711.37 0.006589 5.12 54.85 49.92 0.86

5527.27* 281 708.96 710.52 710.88 0.006492 4.83 58.12 57.15 0.845453.86* 281 708.61 710.08 710.40 0.006187 4.53 61.98 64.80 0.825380.46* 281 708.27 709.64 709.94 0.006376 4.38 64.23 72.48 0.82




Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G.Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

5307.04* 281 707.92 709.30 709.52 0.004585 3.75 74.91 83.19 0.705233.63* 281 707.58 709.19 709.29 0.001666 2.56 109.88 101.46 0.435160.22* 281 707.23 709.17 709.21 0.000532 1.68 167.14 124.76 0.265086.81* 281 706.89 709.16 709.18 0.000191 1.15 244.25 149.74 0.165013.40* 281 706.54 709.16 709.17 0.000072 0.83 341.30 172.49 0.10

4940 281 706.20 709.16 709.17 0.000032 0.63 460.36 188.24 0.074903.25* 281 706.35 709.14 709.16 0.000521 1.23 228.82 145.95 0.174866.51 281 706.50 708.94 709.11 0.002505 3.37 83.30 71.02 0.55

4803.25* 281 706.22 708.71 708.85 0.005502 3.05 91.99 77.29 0.494740.00* 281 705.93 708.34 708.48 0.005067 3.09 91.01 80.17 0.514676.75* 281 705.65 707.94 708.09 0.006231 3.12 90.18 94.78 0.564613.50* 281 705.37 707.36 707.57 0.008944 3.65 76.91 95.64 0.724550.25* 281 705.08 707.22 707.29 0.001759 2.00 134.81 137.82 0.36

4487 281 704.60 707.18 706.23 707.21 0.000633 1.46 193.18 205.82 0.244390.25* 281 704.00 707.08 706.33 707.13 0.000754 1.76 169.03 196.03 0.294293.5* 281 703.40 707.03 705.68 707.07 0.000409 1.60 178.02 163.05 0.23

4196.75* 281 702.80 707.01 705.01 707.03 0.000161 1.23 229.29 173.38 0.154100 281 702.20 707.01 704.35 707.02 0.000066 0.97 292.60 177.10 0.104000 281 702.15 707.01 703.55 707.01 0.000012 0.44 637.36 197.67 0.043900 281 702.70 707.01 703.85 707.01 0.000008 0.36 735.54 204.20 0.043800 281 703.10 707.01 704.52 707.01 0.000013 0.43 688.79 250.55 0.053700 281 701.40 707.01 703.07 707.01 0.000008 0.34 859.03 284.29 0.033500 281 699.30 707.01 707.01 0.000005 0.29 1008.78 328.61 0.033300 281 699.00 707.01 707.01 0.000003 0.34 912.17 243.69 0.033100 281 693.00 707.01 707.01 0.000001 0.29 976.71 152.55 0.022900 281 694.30 707.01 707.01 0.000001 0.23 1245.10 253.96 0.012700 281 698.70 707.01 707.01 0.000002 0.24 1183.92 249.08 0.022500 281 700.00 707.01 707.01 0.000002 0.26 1094.83 223.70 0.022295 281 701.50 707.01 707.01 0.000002 0.24 1159.41 270.50 0.02

2201.69 281 700.30 707.00 707.01 0.000003 0.25 1119.58 274.70 0.022100 281 696.20 707.00 707.00 0.000003 0.27 1128.51 283.18 0.021900 281 700.00 707.00 707.00 0.000003 0.25 1154.17 327.68 0.02




Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G.Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

1700 281 700.20 707.00 707.00 0.000004 0.29 1049.64 364.89 0.031500 281 699.00 707.00 701.10 707.00 0.000008 0.34 867.24 423.82 0.031400 281 699.60 707.00 701.26 707.00 0.000003 0.27 1162.37 508.09 0.021300 281 701.00 707.00 701.74 707.00 0.000002 0.27 1311.08 551.63 0.021200 281 699.00 707.00 701.85 707.00 0.000002 0.22 1327.21 590.55 0.021100 281 697.50 707.00 700.10 707.00 0.000002 0.20 1462.70 631.95 0.021000 281 695.80 707.00 697.76 707.00 0.000001 0.17 1676.73 287.06 0.01861 Bridge

723.28 281 695.80 707.00 697.76 707.00 0.000001 0.17 1676.68 287.06 0.01675 281 698.80 707.00 700.15 707.00 0.000001 0.14 1976.09 790.90 0.01625 281 701.00 707.00 702.01 707.00 0.000001 0.14 2056.24 995.80 0.01575 281 700.30 707.00 701.79 707.00 0.000001 0.13 2124.02 997.30 0.01525 281 700.80 707.00 702.22 707.00 0.000001 0.13 2151.56 997.30 0.01475 281 701.90 707.00 702.89 707.00 0.000001 0.15 1900.59 997.50 0.01425 281 702.30 707.00 688.97 707.00 0.000000 0.06 2921.48 997.50 0.01375 281 703.00 707.00 699.03 707.00 0.000001 0.11 2062.37 998.79 0.01325 281 698.60 707.00 689.93 707.00 0.000000 0.07 2410.13 998.64 0.01275 281 703.00 707.00 686.88 707.00 0.000000 0.07 2360.62 999.18 0.01225 281 701.00 707.00 696.26 707.00 0.000001 0.14 1530.66 998.03 0.01175 281 699.00 707.00 691.02 707.00 0.000000 0.00 27174.26 998.49 0.00125 281 690.00 707.00 686.02 707.00 0.000000 0.00 32947.73 998.52 0.00


HEC-RAS Plan: Current geometry, annual low flow, Lake Entiat at 70404/24/2001


Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

7650 281 730.60 732.91 732.97 0.000987 1.91 147.08 108.18 0.297497 281 730.60 732.15 732.15 732.57 0.012046 5.20 54.01 65.45 1.01

7417.66* 281 729.78 731.16 731.51 0.013054 4.78 58.74 71.83 0.937338.33* 281 728.96 730.15 730.15 730.53 0.011964 4.93 57.03 76.99 1.01

7259.* 281 728.13 729.28 729.25 729.60 0.010839 4.56 61.68 88.51 0.967179.66* 281 727.31 728.45 728.72 0.010983 4.19 67.06 96.80 0.897100.33* 281 726.49 727.57 727.84 0.011364 4.19 67.02 97.12 0.897020.99* 281 725.67 726.71 726.97 0.010595 4.11 68.41 99.63 0.876941.66* 281 724.84 725.78 725.77 726.09 0.011535 4.46 63.06 98.46 0.986862.33* 281 724.02 724.95 724.91 725.23 0.010041 4.31 65.26 100.95 0.94

6783 281 723.20 724.10 724.10 724.42 0.010398 4.55 61.76 97.94 1.016770 281 723.15 723.87 723.87 724.13 0.011622 4.13 67.97 131.09 1.01

6711.79* 281 721.66 722.62 722.62 722.91 0.011378 4.30 65.30 116.73 1.016653.59* 281 720.17 721.29 721.29 721.63 0.010790 4.66 60.25 91.71 1.016595.39* 281 718.68 719.95 719.95 720.33 0.010407 4.95 56.82 77.09 1.026537.19* 281 717.19 718.60 718.60 719.02 0.009994 5.23 53.74 65.02 1.01

6479 281 715.70 717.46 717.78 0.004957 4.51 62.34 55.54 0.756406.14* 281 715.30 717.08 717.40 0.005232 4.57 61.46 55.86 0.776333.28* 281 714.90 716.67 717.01 0.005506 4.66 60.27 55.27 0.796260.42* 281 714.50 716.26 716.60 0.005702 4.69 59.91 55.89 0.806187.57* 281 714.10 715.84 716.18 0.005896 4.68 60.10 57.77 0.816114.71* 281 713.70 715.39 715.73 0.006476 4.70 59.76 61.11 0.846041.85* 281 713.30 714.92 715.25 0.006523 4.59 61.16 65.07 0.84

5969 281 712.90 714.39 714.74 0.007492 4.73 59.40 67.01 0.895895.33* 281 712.18 713.77 714.15 0.008360 4.94 56.87 65.41 0.935821.67* 281 711.46 713.07 713.05 713.51 0.009018 5.30 52.99 58.03 0.985748.01* 281 710.74 712.34 712.34 712.82 0.009584 5.55 50.60 54.13 1.015674.35* 281 710.02 711.60 711.60 712.10 0.009459 5.67 49.55 50.83 1.015600.69 281 709.30 710.97 711.37 0.006589 5.12 54.85 49.92 0.86

5527.27* 281 708.96 710.52 710.88 0.006492 4.83 58.12 57.15 0.845453.86* 281 708.61 710.08 710.40 0.006187 4.53 61.98 64.80 0.825380.46* 281 708.27 709.64 709.94 0.006376 4.38 64.23 72.48 0.82




Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

5307.04* 281 707.92 709.30 709.52 0.004582 3.75 74.93 83.19 0.705233.63* 281 707.58 709.19 709.29 0.001664 2.56 109.92 101.47 0.435160.22* 281 707.23 709.17 709.21 0.000531 1.68 167.19 124.77 0.265086.81* 281 706.89 709.16 709.18 0.000191 1.15 244.32 149.74 0.165013.40* 281 706.54 709.16 709.17 0.000072 0.83 341.40 172.49 0.10

4940 281 706.20 709.16 709.17 0.000032 0.63 460.47 188.24 0.074903.25* 281 706.35 709.14 709.16 0.000520 1.23 228.91 145.98 0.174866.51 281 706.50 708.94 709.11 0.002501 3.37 83.36 71.04 0.55

4803.25* 281 706.22 708.71 708.85 0.005481 3.05 92.12 77.34 0.494740.00* 281 705.93 708.34 708.49 0.005020 3.07 91.42 80.41 0.514676.75* 281 705.65 707.96 708.11 0.005915 3.05 92.21 96.04 0.554613.50* 281 705.37 707.29 707.54 0.011353 3.97 70.85 93.58 0.804550.25* 281 705.08 706.98 707.10 0.003460 2.59 104.21 121.72 0.50

4487 281 704.60 706.88 706.23 706.94 0.001377 1.95 144.35 193.12 0.364390.25* 281 704.00 706.50 706.34 706.67 0.004109 3.44 85.01 157.24 0.714293.5* 281 703.40 705.84 705.68 706.12 0.005643 4.24 66.26 105.89 0.79

4196.75* 281 702.80 705.18 705.01 705.48 0.005658 4.39 64.06 97.80 0.794100 281 702.20 704.94 704.35 705.08 0.001930 3.02 93.00 119.46 0.484000 281 702.15 704.94 703.55 704.98 0.000366 1.60 175.37 147.15 0.223900 281 702.70 704.89 703.85 704.94 0.000412 1.62 172.94 165.76 0.233800 281 703.10 704.53 704.53 704.80 0.011445 4.15 67.88 180.81 1.013700 281 701.40 704.11 703.07 704.18 0.000786 2.08 141.47 148.15 0.313500 281 699.30 704.14 704.14 0.000039 0.75 378.48 139.29 0.083300 281 699.00 704.13 704.14 0.000036 0.74 378.23 123.04 0.073100 281 693.00 704.13 704.13 0.000004 0.44 638.10 84.05 0.032900 281 694.30 704.13 704.13 0.000004 0.37 763.55 146.03 0.032700 281 698.70 704.13 704.13 0.000011 0.46 606.73 162.89 0.042500 281 700.00 704.12 704.13 0.000035 0.60 470.70 209.71 0.072295 281 701.50 704.11 704.12 0.000088 0.72 387.88 260.77 0.10

2201.69 281 700.30 704.10 704.10 0.000064 0.73 387.04 202.27 0.092100 281 696.20 704.08 704.09 0.000058 0.73 387.26 184.05 0.091900 281 700.00 704.07 704.08 0.000079 0.74 380.40 227.44 0.10




Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

1700 281 700.20 704.05 704.06 0.000088 0.88 320.20 161.21 0.111500 281 699.00 704.03 701.10 704.05 0.000091 1.04 269.96 106.40 0.121400 281 699.60 704.03 701.26 704.04 0.000031 0.64 436.44 159.42 0.071300 281 701.00 704.03 701.74 704.03 0.000035 0.63 450.64 210.64 0.071200 281 699.00 704.03 701.85 704.03 0.000039 0.61 462.30 328.59 0.071100 281 697.50 704.02 700.10 704.03 0.000026 0.53 532.70 430.02 0.061000 281 695.80 704.02 697.76 704.03 0.000007 0.33 848.79 269.75 0.03861 Bridge

723.28 281 695.80 704.02 697.76 704.02 0.000007 0.33 848.37 269.74 0.03675 281 698.80 704.02 700.15 704.02 0.000018 0.41 686.09 507.33 0.05625 281 701.00 704.02 702.01 704.02 0.000062 0.58 485.01 732.38 0.09575 281 700.30 704.01 701.79 704.02 0.000059 0.57 503.86 857.66 0.09525 281 700.80 704.01 702.22 704.02 0.000061 0.56 521.15 912.42 0.09475 281 701.90 704.00 702.89 704.01 0.000121 0.68 419.43 902.36 0.12425 281 702.30 704.01 688.97 704.01 0.000001 0.05 1140.17 863.47 0.01375 281 703.00 703.99 699.03 704.01 0.000033 0.20 395.03 835.03 0.05325 281 698.60 704.00 689.93 704.00 0.000002 0.08 770.20 797.80 0.01275 281 703.00 704.00 686.88 704.00 0.000002 0.06 1024.23 930.49 0.01225 281 701.00 704.00 696.26 704.00 0.000008 0.19 629.56 996.06 0.03175 281 699.00 704.00 691.02 704.00 0.000000 0.00 24181.05 996.98 0.00125 281 690.00 704.00 686.02 704.00 0.000000 0.00 29954.40 997.03 0.00


HEC-RAS Plan: Sediment modification to station 7+00, 25 yr flood, Lake Entiat at 707.304/25/2001


Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

7650 1334 730.60 734.75 734.98 0.001279 3.84 354.65 116.89 0.387497 1334 730.60 733.58 733.58 734.50 0.009618 7.71 174.24 97.89 1.01

7417.66* 1334 729.78 732.47 732.47 733.35 0.012543 7.52 177.95 104.88 1.017338.33* 1334 728.96 731.45 731.45 732.27 0.009865 7.30 183.18 112.54 1.00

7259.* 1334 728.13 730.46 730.46 731.25 0.009957 7.17 186.30 119.71 1.017179.66* 1334 727.31 729.52 729.52 730.28 0.010911 6.98 191.37 128.04 1.007100.33* 1334 726.49 728.63 728.62 729.34 0.011111 6.80 196.50 138.91 1.007020.99* 1334 725.67 727.74 727.74 728.43 0.011670 6.69 199.63 147.68 1.016941.66* 1334 724.84 726.87 726.87 727.56 0.009502 6.69 199.84 146.83 1.016862.33* 1334 724.02 726.02 726.02 726.73 0.008277 6.76 197.58 141.63 1.01

6783 1334 723.20 725.22 725.22 725.94 0.007780 6.83 195.71 137.93 1.016770 1334 723.15 724.80 724.80 725.48 0.008415 6.60 202.17 152.13 1.01

6711.79* 1334 721.66 723.65 723.65 724.37 0.008175 6.82 195.70 136.84 1.006653.59* 1334 720.17 722.46 722.46 723.26 0.007932 7.19 185.59 117.11 1.016595.39* 1334 718.68 721.27 721.27 722.18 0.007657 7.65 174.35 97.41 1.016537.19* 1334 717.19 720.09 720.09 721.14 0.007285 8.22 162.24 78.12 1.01

6479 1334 715.70 719.16 720.21 0.005440 8.21 162.42 62.33 0.906406.14* 1334 715.30 718.75 719.80 0.005674 8.24 161.97 64.05 0.916333.28* 1334 714.90 718.31 718.19 719.38 0.006091 8.31 160.54 66.23 0.946260.42* 1334 714.50 717.84 717.76 718.92 0.006409 8.35 159.72 67.98 0.966187.57* 1334 714.10 717.37 717.30 718.45 0.006609 8.35 159.67 69.50 0.976114.71* 1334 713.70 716.85 716.84 717.96 0.006966 8.42 158.37 70.80 0.996041.85* 1334 713.30 716.34 716.34 717.44 0.007128 8.42 158.46 72.02 1.00

5969 1334 712.90 715.80 715.80 716.91 0.007292 8.43 158.34 72.98 1.015895.33* 1334 712.18 715.24 715.24 716.33 0.007138 8.39 159.08 72.89 1.005821.67* 1334 711.46 714.63 714.63 715.74 0.007256 8.46 157.74 72.39 1.015748.01* 1334 710.74 714.03 714.03 715.15 0.007167 8.47 157.47 71.48 1.015674.35* 1334 710.02 713.35 713.35 714.52 0.007129 8.66 153.96 67.21 1.015600.69 1334 709.30 712.65 712.65 713.85 0.007046 8.80 151.62 64.01 1.01

5527.27* 1334 708.96 712.05 712.05 713.15 0.007212 8.43 158.24 72.82 1.015453.86* 1334 708.61 711.47 711.47 712.49 0.007409 8.10 164.60 82.20 1.015380.46* 1334 708.27 711.19 711.91 0.005096 6.80 196.29 96.23 0.84




Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

5307.04* 1334 707.92 711.16 711.57 0.002372 5.09 261.97 114.85 0.595233.63* 1334 707.58 711.17 711.40 0.001112 3.85 347.06 132.05 0.425160.22* 1334 707.23 711.18 711.32 0.000553 3.01 446.49 146.82 0.305086.81* 1334 706.89 711.18 711.27 0.000299 2.42 565.33 169.93 0.225013.40* 1334 706.54 711.19 711.25 0.000171 1.98 703.98 185.00 0.17

4940 1334 706.20 711.19 711.23 0.000103 1.65 854.83 227.00 0.144903.25* 1334 706.35 711.14 711.22 0.000666 2.25 610.91 222.91 0.224866.51 1334 706.50 710.70 711.14 0.002461 5.35 252.32 121.08 0.64

4803.25* 1334 706.22 710.50 710.85 0.006527 4.74 284.04 135.93 0.574740.00* 1334 705.93 710.03 710.37 0.007053 4.72 284.93 151.93 0.604676.75* 1334 705.65 709.51 709.85 0.007942 4.64 289.39 181.00 0.644613.50* 1334 705.37 708.58 709.12 0.013185 5.91 226.50 170.26 0.894550.25* 1334 705.08 708.32 708.58 0.003904 3.72 339.76 219.78 0.53

4487 1334 704.60 708.32 707.29 708.44 0.000743 1.87 565.09 276.48 0.244390.25* 1334 704.00 708.23 707.33 708.34 0.001148 3.02 519.25 248.13 0.354293.5* 1334 703.40 707.77 707.13 708.13 0.002880 4.85 289.81 236.29 0.60

4196.75* 1334 702.80 707.51 706.48 707.86 0.001933 4.72 286.52 189.30 0.524100 1334 702.20 707.44 705.87 707.68 0.000944 3.94 342.49 195.26 0.404000 1334 702.15 707.54 704.97 707.59 0.000169 1.82 744.71 210.59 0.173900 1334 702.70 707.53 704.98 707.57 0.000111 1.52 847.41 232.44 0.143800 1334 703.10 707.52 705.47 707.56 0.000174 1.73 820.12 268.51 0.173700 1334 701.40 707.51 704.57 707.53 0.000106 1.40 1001.20 287.72 0.133500 1334 699.30 707.50 707.52 0.000065 1.18 1170.82 331.72 0.113300 1334 699.00 707.47 707.50 0.000056 1.44 1028.89 262.34 0.103100 1334 693.00 707.47 707.50 0.000027 1.27 1058.98 200.22 0.092900 1334 694.30 707.47 707.49 0.000019 1.02 1376.36 289.52 0.062700 1334 698.70 707.47 707.49 0.000028 1.06 1301.59 258.55 0.082500 1334 700.00 707.46 707.48 0.000037 1.12 1197.10 226.19 0.082295 1334 701.50 707.45 707.47 0.000039 1.04 1281.08 271.62 0.08

2201.69 1334 700.30 707.45 707.46 0.000045 1.07 1241.14 275.87 0.092100 1334 696.20 707.43 707.45 0.000049 1.14 1250.43 285.41 0.091900 1334 700.00 707.43 707.44 0.000044 1.10 1296.18 343.06 0.09




Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

1700 1334 700.20 707.41 707.43 0.000065 1.23 1200.32 387.91 0.111500 1334 699.00 707.39 702.84 707.42 0.000118 1.44 1008.35 442.48 0.141400 1334 699.60 707.39 702.34 707.41 0.000048 1.16 1297.13 512.78 0.091300 1334 701.00 707.38 702.67 707.40 0.000040 1.18 1448.98 553.54 0.091200 1334 699.00 707.38 702.78 707.40 0.000034 0.97 1474.75 591.75 0.081100 1334 697.50 707.38 702.28 707.39 0.000027 0.89 1601.14 634.09 0.071000 1334 695.80 707.38 699.25 707.39 0.000014 0.75 1786.73 289.40 0.05861 Bridge

723.28 1334 695.80 707.38 699.25 707.39 0.000014 0.75 1785.71 289.38 0.05675 1334 695.71 707.38 700.96 707.39 0.000008 0.77 2202.67 821.45 0.04625 1334 695.14 707.22 698.68 707.37 0.000101 3.15 423.88 716.60 0.16575 1334 694.57 707.22 698.11 707.36 0.000087 3.00 444.06 717.10 0.15525 1334 694.00 707.23 697.54 707.35 0.000075 2.87 464.22 717.55 0.14475 1334 693.43 707.23 696.97 707.35 0.000065 2.75 484.36 717.95 0.13425 1334 692.86 707.23 696.40 707.34 0.000057 2.64 504.49 718.31 0.12375 1334 692.29 707.24 695.83 707.34 0.000050 2.54 524.61 718.62 0.12325 1334 691.71 707.24 695.25 707.33 0.000044 2.45 545.06 718.91 0.11275 1334 696.00 707.23 698.88 707.33 0.000069 2.48 536.93 829.92 0.13225 1334 671.00 707.30 675.70 707.30 0.000000 0.05 26512.37 998.02 0.00175 1334 673.00 707.30 675.95 707.30 0.000000 0.04 27147.32 974.20 0.00125 1334 667.00 707.30 668.76 707.30 0.000000 0.03 37064.91 998.58 0.00


HEC-RAS Plan: Sediment modification to station 7+00, annual low flow, Lake Entiat at 707.304/25/2001


Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

7650 281 730.60 732.91 732.97 0.000987 1.91 147.08 108.18 0.297497 281 730.60 732.15 732.15 732.57 0.012046 5.20 54.01 65.45 1.01

7417.66* 281 729.78 731.16 731.51 0.013054 4.78 58.74 71.83 0.937338.33* 281 728.96 730.15 730.15 730.53 0.011964 4.93 57.03 76.99 1.01

7259.* 281 728.13 729.28 729.25 729.60 0.010839 4.56 61.68 88.51 0.967179.66* 281 727.31 728.45 728.72 0.010983 4.19 67.06 96.80 0.897100.33* 281 726.49 727.57 727.84 0.011364 4.19 67.02 97.12 0.897020.99* 281 725.67 726.71 726.97 0.010595 4.11 68.41 99.63 0.876941.66* 281 724.84 725.78 725.77 726.09 0.011535 4.46 63.06 98.46 0.986862.33* 281 724.02 724.95 724.91 725.23 0.010041 4.31 65.26 100.95 0.94

6783 281 723.20 724.10 724.10 724.42 0.010398 4.55 61.76 97.94 1.016770 281 723.15 723.87 723.87 724.13 0.011622 4.13 67.97 131.09 1.01

6711.79* 281 721.66 722.62 722.62 722.91 0.011378 4.30 65.30 116.73 1.016653.59* 281 720.17 721.29 721.29 721.63 0.010790 4.66 60.25 91.71 1.016595.39* 281 718.68 719.95 719.95 720.33 0.010407 4.95 56.82 77.09 1.026537.19* 281 717.19 718.60 718.60 719.02 0.009994 5.23 53.74 65.02 1.01

6479 281 715.70 717.46 717.78 0.004957 4.51 62.34 55.54 0.756406.14* 281 715.30 717.08 717.40 0.005232 4.57 61.46 55.86 0.776333.28* 281 714.90 716.67 717.01 0.005506 4.66 60.27 55.27 0.796260.42* 281 714.50 716.26 716.60 0.005702 4.69 59.91 55.89 0.806187.57* 281 714.10 715.84 716.18 0.005896 4.68 60.10 57.77 0.816114.71* 281 713.70 715.39 715.73 0.006476 4.70 59.76 61.11 0.846041.85* 281 713.30 714.92 715.25 0.006523 4.59 61.16 65.07 0.84

5969 281 712.90 714.39 714.74 0.007492 4.73 59.40 67.01 0.895895.33* 281 712.18 713.77 714.15 0.008360 4.94 56.87 65.41 0.935821.67* 281 711.46 713.07 713.05 713.51 0.009018 5.30 52.99 58.03 0.985748.01* 281 710.74 712.34 712.34 712.82 0.009584 5.55 50.60 54.13 1.015674.35* 281 710.02 711.60 711.60 712.10 0.009459 5.67 49.55 50.83 1.015600.69 281 709.30 710.97 711.37 0.006589 5.12 54.85 49.92 0.86

5527.27* 281 708.96 710.52 710.88 0.006492 4.83 58.12 57.15 0.845453.86* 281 708.61 710.08 710.40 0.006187 4.53 61.98 64.80 0.825380.46* 281 708.27 709.64 709.94 0.006375 4.37 64.23 72.48 0.82




Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

5307.04* 281 707.92 709.30 709.52 0.004592 3.75 74.88 83.18 0.705233.63* 281 707.58 709.19 709.29 0.001669 2.56 109.81 101.45 0.435160.22* 281 707.23 709.17 709.21 0.000533 1.68 167.05 124.74 0.265086.81* 281 706.89 709.16 709.18 0.000191 1.15 244.15 149.73 0.165013.40* 281 706.54 709.16 709.17 0.000072 0.83 341.19 172.48 0.10

4940 281 706.20 709.16 709.17 0.000032 0.63 460.24 188.23 0.074903.25* 281 706.35 709.14 709.16 0.000521 1.23 228.72 145.92 0.174866.51 281 706.50 708.94 709.11 0.002512 3.38 83.22 70.98 0.55

4803.25* 281 706.22 708.71 708.85 0.005530 3.06 91.82 77.22 0.494740.00* 281 705.93 708.33 708.48 0.005135 3.11 90.45 79.85 0.514676.75* 281 705.65 707.91 708.07 0.006536 3.20 87.72 92.34 0.584613.50* 281 705.37 707.51 707.65 0.005448 3.08 91.30 100.29 0.574550.25* 281 705.08 707.43 707.48 0.001062 1.60 166.59 159.02 0.28

4487 281 704.60 707.41 706.23 707.43 0.000385 1.21 233.35 214.68 0.184390.25* 281 704.00 707.36 706.33 707.38 0.000405 1.41 213.46 205.46 0.214293.5* 281 703.40 707.32 705.68 707.35 0.000252 1.33 218.22 195.50 0.19

4196.75* 281 702.80 707.31 705.01 707.33 0.000109 1.08 262.61 180.78 0.124100 281 702.20 707.31 704.35 707.32 0.000048 0.87 326.97 187.41 0.094000 281 702.15 707.31 703.55 707.31 0.000009 0.41 697.86 204.67 0.043900 281 702.70 707.31 703.85 707.31 0.000006 0.34 797.96 215.31 0.033800 281 703.10 707.31 704.52 707.31 0.000010 0.39 765.78 260.96 0.043700 281 701.40 707.31 703.07 707.31 0.000006 0.31 945.03 286.21 0.033500 281 699.30 707.31 707.31 0.000003 0.26 1108.25 330.76 0.023300 281 699.00 707.31 707.31 0.000003 0.32 986.46 252.05 0.023100 281 693.00 707.31 707.31 0.000001 0.27 1027.69 185.05 0.022900 281 694.30 707.31 707.31 0.000001 0.22 1328.76 285.62 0.012700 281 698.70 707.31 707.31 0.000001 0.23 1260.03 255.24 0.022500 281 700.00 707.31 707.31 0.000002 0.24 1162.61 225.35 0.022295 281 701.50 707.31 707.31 0.000002 0.23 1241.20 271.26 0.02

2201.69 281 700.30 707.31 707.31 0.000002 0.23 1202.69 275.52 0.022100 281 696.20 707.31 707.31 0.000002 0.25 1214.27 284.56 0.021900 281 700.00 707.31 707.31 0.000002 0.24 1255.12 342.37 0.02




Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

1700 281 700.20 707.30 707.31 0.000003 0.27 1160.97 371.23 0.021500 281 699.00 707.30 701.10 707.31 0.000006 0.31 977.52 441.45 0.031400 281 699.60 707.30 701.26 707.30 0.000002 0.25 1268.49 512.42 0.021300 281 701.00 707.30 701.74 707.30 0.000002 0.25 1420.75 553.15 0.021200 281 699.00 707.30 701.85 707.30 0.000002 0.21 1444.23 591.53 0.021100 281 697.50 707.30 700.10 707.30 0.000001 0.19 1572.71 633.64 0.021000 281 695.80 707.30 697.76 707.30 0.000001 0.16 1764.00 288.91 0.01861 Bridge

723.28 281 695.80 707.30 697.76 707.30 0.000001 0.16 1763.95 288.91 0.01675 281 695.71 707.30 698.46 707.30 0.000000 0.16 2168.21 816.52 0.01625 281 695.14 707.30 696.39 707.30 0.000004 0.66 426.69 724.87 0.03575 281 694.57 707.30 695.82 707.30 0.000004 0.63 446.70 724.90 0.03525 281 694.00 707.30 695.25 707.30 0.000003 0.60 466.72 724.91 0.03475 281 693.43 707.30 694.68 707.30 0.000003 0.58 486.73 724.93 0.03425 281 692.86 707.30 694.11 707.30 0.000002 0.55 506.74 724.95 0.03375 281 692.29 707.30 693.54 707.30 0.000002 0.53 526.75 724.96 0.02325 281 691.71 707.30 692.96 707.30 0.000002 0.51 547.11 724.97 0.02275 281 696.00 707.30 697.02 707.30 0.000003 0.52 540.00 833.86 0.03225 281 671.00 707.30 673.70 707.30 0.000000 0.01 26512.37 998.02 0.00175 281 673.00 707.30 674.60 707.30 0.000000 0.01 27147.32 974.20 0.00125 281 667.00 707.30 667.62 707.30 0.000000 0.01 37064.91 998.58 0.00


HEC-RAS Plan: Sediment modification to station 33+00, 25-yr flood04/25/2001


Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

7650 1334 730.60 734.75 734.98 0.001279 3.84 354.65 116.89 0.387497 1334 730.60 733.58 733.58 734.50 0.009618 7.71 174.24 97.89 1.01

7417.66* 1334 729.78 732.47 732.47 733.35 0.012543 7.52 177.95 104.88 1.017338.33* 1334 728.96 731.45 731.45 732.27 0.009865 7.30 183.18 112.54 1.00

7259.* 1334 728.13 730.46 730.46 731.25 0.009957 7.17 186.30 119.71 1.017179.66* 1334 727.31 729.52 729.52 730.28 0.010911 6.98 191.37 128.04 1.007100.33* 1334 726.49 728.63 728.62 729.34 0.011111 6.80 196.50 138.91 1.007020.99* 1334 725.67 727.74 727.74 728.43 0.011670 6.69 199.63 147.68 1.016941.66* 1334 724.84 726.87 726.87 727.56 0.009502 6.69 199.84 146.83 1.016862.33* 1334 724.02 726.02 726.02 726.73 0.008277 6.76 197.58 141.63 1.01

6783 1334 723.20 725.22 725.22 725.94 0.007780 6.83 195.71 137.93 1.016770 1334 723.15 724.80 724.80 725.48 0.008415 6.60 202.17 152.13 1.01

6711.79* 1334 721.66 723.65 723.65 724.37 0.008175 6.82 195.70 136.84 1.006653.59* 1334 720.17 722.46 722.46 723.26 0.007932 7.19 185.59 117.11 1.016595.39* 1334 718.68 721.27 721.27 722.18 0.007657 7.65 174.35 97.41 1.016537.19* 1334 717.19 720.09 720.09 721.14 0.007285 8.22 162.24 78.12 1.01

6479 1334 715.70 719.16 720.21 0.005440 8.21 162.42 62.33 0.906406.14* 1334 715.30 718.75 719.80 0.005674 8.24 161.97 64.05 0.916333.28* 1334 714.90 718.31 718.19 719.38 0.006091 8.31 160.54 66.23 0.946260.42* 1334 714.50 717.84 717.76 718.92 0.006409 8.35 159.72 67.98 0.966187.57* 1334 714.10 717.37 717.30 718.45 0.006609 8.35 159.67 69.50 0.976114.71* 1334 713.70 716.85 716.84 717.96 0.006966 8.42 158.37 70.80 0.996041.85* 1334 713.30 716.34 716.34 717.44 0.007128 8.42 158.46 72.02 1.00

5969 1334 712.90 715.80 715.80 716.91 0.007292 8.43 158.34 72.98 1.015895.33* 1334 712.18 715.24 715.24 716.33 0.007138 8.39 159.08 72.89 1.005821.67* 1334 711.46 714.63 714.63 715.74 0.007256 8.46 157.74 72.39 1.015748.01* 1334 710.74 714.03 714.03 715.15 0.007167 8.47 157.47 71.48 1.015674.35* 1334 710.02 713.35 713.35 714.52 0.007129 8.66 153.96 67.21 1.015600.69 1334 709.30 712.65 712.65 713.85 0.007046 8.80 151.62 64.01 1.01

5527.27* 1334 708.96 712.05 712.05 713.15 0.007212 8.43 158.24 72.82 1.015453.86* 1334 708.61 711.47 711.47 712.49 0.007409 8.10 164.60 82.20 1.015380.46* 1334 708.27 711.19 711.91 0.005102 6.80 196.22 96.22 0.84




Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

5307.04* 1334 707.92 711.16 711.57 0.002374 5.09 261.88 114.83 0.595233.63* 1334 707.58 711.17 711.40 0.001113 3.85 346.96 132.05 0.425160.22* 1334 707.23 711.17 711.32 0.000554 3.01 446.37 146.81 0.305086.81* 1334 706.89 711.18 711.27 0.000300 2.42 565.17 169.92 0.225013.40* 1334 706.54 711.19 711.25 0.000171 1.98 703.81 185.00 0.17

4940 1334 706.20 711.19 711.23 0.000104 1.65 854.62 226.86 0.144903.25* 1334 706.35 711.14 711.22 0.000667 2.25 610.70 222.75 0.224866.51 1334 706.50 710.70 711.14 0.002466 5.35 252.11 121.03 0.64

4803.25* 1334 706.22 710.50 710.85 0.006545 4.75 283.73 135.85 0.574740.00* 1334 705.93 710.03 710.37 0.007076 4.73 284.28 151.52 0.604676.75* 1334 705.65 709.50 709.84 0.008048 4.67 287.50 179.99 0.644613.50* 1334 705.37 708.61 709.13 0.012553 5.78 231.76 173.80 0.874550.25* 1334 705.08 708.39 708.62 0.003526 3.57 353.83 223.40 0.50

4487 1334 704.60 708.38 707.29 708.49 0.000698 1.82 582.65 282.86 0.234390.25* 1334 704.00 708.29 707.33 708.40 0.001048 2.94 536.59 255.55 0.344293.5* 1334 703.40 707.91 707.13 708.22 0.002390 4.52 312.69 241.63 0.55

4196.75* 1334 702.80 707.70 706.48 708.00 0.001578 4.40 309.23 198.67 0.484100 1334 702.20 707.64 705.87 707.85 0.000781 3.70 365.86 203.99 0.374000 1334 702.15 707.72 704.97 707.77 0.000143 1.73 784.26 215.93 0.153900 1334 702.70 707.72 704.98 707.75 0.000096 1.46 892.12 247.51 0.133800 1334 703.10 707.70 705.47 707.74 0.000145 1.64 871.64 275.48 0.153700 1334 701.40 707.70 704.57 707.72 0.000089 1.33 1056.64 292.09 0.123500 1334 699.30 707.69 707.71 0.000055 1.12 1234.95 334.62 0.103300 1334 699.00 707.67 707.70 0.000049 1.38 1081.39 274.54 0.103100 1334 693.00 707.67 707.69 0.000025 1.23 1099.61 217.19 0.092900 1334 694.30 707.67 707.68 0.000017 0.99 1433.04 291.59 0.062700 1334 698.70 707.67 707.68 0.000025 1.02 1352.53 262.54 0.072500 1334 697.30 707.66 707.68 0.000019 1.22 1537.66 235.61 0.072295 1334 697.10 707.66 707.67 0.000029 1.42 1506.44 272.13 0.08

2201.69 1334 697.00 707.65 707.66 0.000047 1.48 1335.74 276.39 0.092100 1334 696.20 707.32 707.61 0.000487 6.01 1217.62 284.64 0.331900 1334 696.62 707.38 707.50 0.000189 3.45 1444.87 342.83 0.20




Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

1700 1334 696.38 707.41 707.47 0.000065 2.07 1343.79 388.00 0.121500 1334 696.15 707.35 701.10 707.45 0.000135 2.80 1160.27 441.98 0.171400 1334 696.00 707.37 700.70 707.42 0.000071 2.24 1538.05 512.70 0.131300 1334 695.92 707.39 700.16 707.41 0.000030 1.66 1743.67 553.57 0.091200 1334 695.80 707.37 700.95 707.40 0.000047 2.09 1589.14 591.72 0.111100 1334 695.69 707.38 698.89 707.40 0.000020 1.25 1937.88 632.39 0.071000 1334 695.80 707.38 699.25 707.39 0.000014 0.75 1786.73 289.40 0.05861 Bridge

723.28 1334 695.80 707.38 699.25 707.39 0.000014 0.75 1785.71 289.38 0.05675 1334 695.71 707.38 700.96 707.39 0.000008 0.77 2202.67 821.45 0.04625 1334 695.14 707.22 698.68 707.37 0.000101 3.15 423.88 716.60 0.16575 1334 694.57 707.22 698.11 707.36 0.000087 3.00 444.06 717.10 0.15525 1334 694.00 707.23 697.54 707.35 0.000075 2.87 464.22 717.55 0.14475 1334 693.43 707.23 696.97 707.35 0.000065 2.75 484.36 717.95 0.13425 1334 692.86 707.23 696.40 707.34 0.000057 2.64 504.49 718.31 0.12375 1334 692.29 707.24 695.83 707.34 0.000050 2.54 524.61 718.62 0.12325 1334 691.71 707.24 695.25 707.33 0.000044 2.45 545.06 718.91 0.11275 1334 696.00 707.23 698.88 707.33 0.000069 2.48 536.93 829.92 0.13225 1334 671.00 707.30 675.70 707.30 0.000000 0.05 26512.37 998.02 0.00175 1334 673.00 707.30 675.95 707.30 0.000000 0.04 27147.32 974.20 0.00125 1334 667.00 707.30 668.76 707.30 0.000000 0.03 37064.91 998.58 0.00


HEC-RAS Plan: Sediment modification to station 33+00, annual low flow04/25/2001


Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

7650 281 730.60 732.91 732.97 0.000987 1.91 147.08 108.18 0.297497 281 730.60 732.15 732.15 732.57 0.012046 5.20 54.01 65.45 1.01

7417.66* 281 729.78 731.16 731.51 0.013054 4.78 58.74 71.83 0.937338.33* 281 728.96 730.15 730.15 730.53 0.011964 4.93 57.03 76.99 1.01

7259.* 281 728.13 729.28 729.25 729.60 0.010839 4.56 61.68 88.51 0.967179.66* 281 727.31 728.45 728.72 0.010983 4.19 67.06 96.80 0.897100.33* 281 726.49 727.57 727.84 0.011364 4.19 67.02 97.12 0.897020.99* 281 725.67 726.71 726.97 0.010595 4.11 68.41 99.63 0.876941.66* 281 724.84 725.78 725.77 726.09 0.011535 4.46 63.06 98.46 0.986862.33* 281 724.02 724.95 724.91 725.23 0.010041 4.31 65.26 100.95 0.94

6783 281 723.20 724.10 724.10 724.42 0.010398 4.55 61.76 97.94 1.016770 281 723.15 723.87 723.87 724.13 0.011622 4.13 67.97 131.09 1.01

6711.79* 281 721.66 722.62 722.62 722.91 0.011378 4.30 65.30 116.73 1.016653.59* 281 720.17 721.29 721.29 721.63 0.010790 4.66 60.25 91.71 1.016595.39* 281 718.68 719.95 719.95 720.33 0.010407 4.95 56.82 77.09 1.026537.19* 281 717.19 718.60 718.60 719.02 0.009994 5.23 53.74 65.02 1.01

6479 281 715.70 717.46 717.78 0.004957 4.51 62.34 55.54 0.756406.14* 281 715.30 717.08 717.40 0.005232 4.57 61.46 55.86 0.776333.28* 281 714.90 716.67 717.01 0.005506 4.66 60.27 55.27 0.796260.42* 281 714.50 716.26 716.60 0.005702 4.69 59.91 55.89 0.806187.57* 281 714.10 715.84 716.18 0.005896 4.68 60.10 57.77 0.816114.71* 281 713.70 715.39 715.73 0.006476 4.70 59.76 61.11 0.846041.85* 281 713.30 714.92 715.25 0.006523 4.59 61.16 65.07 0.84

5969 281 712.90 714.39 714.74 0.007492 4.73 59.40 67.01 0.895895.33* 281 712.18 713.77 714.15 0.008360 4.94 56.87 65.41 0.935821.67* 281 711.46 713.07 713.05 713.51 0.009018 5.30 52.99 58.03 0.985748.01* 281 710.74 712.34 712.34 712.82 0.009584 5.55 50.60 54.13 1.015674.35* 281 710.02 711.60 711.60 712.10 0.009459 5.67 49.55 50.83 1.015600.69 281 709.30 710.97 711.37 0.006589 5.12 54.85 49.92 0.86

5527.27* 281 708.96 710.52 710.88 0.006492 4.83 58.12 57.15 0.845453.86* 281 708.61 710.08 710.40 0.006187 4.53 61.98 64.80 0.825380.46* 281 708.27 709.64 709.94 0.006375 4.37 64.23 72.48 0.82




Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

5307.04* 281 707.92 709.30 709.52 0.004592 3.75 74.88 83.18 0.705233.63* 281 707.58 709.19 709.29 0.001669 2.56 109.82 101.45 0.435160.22* 281 707.23 709.17 709.21 0.000532 1.68 167.06 124.74 0.265086.81* 281 706.89 709.16 709.18 0.000191 1.15 244.16 149.73 0.165013.40* 281 706.54 709.16 709.17 0.000072 0.83 341.20 172.48 0.10

4940 281 706.20 709.16 709.17 0.000032 0.63 460.25 188.23 0.074903.25* 281 706.35 709.14 709.16 0.000521 1.23 228.73 145.93 0.174866.51 281 706.50 708.94 709.11 0.002512 3.38 83.23 70.99 0.55

4803.25* 281 706.22 708.71 708.85 0.005529 3.06 91.83 77.22 0.494740.00* 281 705.93 708.33 708.48 0.005133 3.11 90.46 79.85 0.514676.75* 281 705.65 707.91 708.07 0.006531 3.20 87.76 92.38 0.584613.50* 281 705.37 707.51 707.66 0.005353 3.06 91.85 100.46 0.564550.25* 281 705.08 707.44 707.49 0.001045 1.59 167.72 159.73 0.28

4487 281 704.60 707.41 706.23 707.44 0.000380 1.20 234.66 214.96 0.184390.25* 281 704.00 707.36 706.33 707.39 0.000398 1.40 214.83 205.75 0.214293.5* 281 703.40 707.33 705.68 707.36 0.000248 1.32 219.57 195.74 0.19

4196.75* 281 702.80 707.32 705.01 707.34 0.000108 1.08 263.61 181.00 0.124100 281 702.20 707.32 704.35 707.33 0.000047 0.87 327.99 187.99 0.094000 281 702.15 707.32 703.55 707.32 0.000009 0.41 699.66 204.87 0.043900 281 702.70 707.32 703.85 707.32 0.000006 0.34 799.85 215.99 0.033800 281 703.10 707.32 704.52 707.32 0.000009 0.39 768.08 261.28 0.043700 281 701.40 707.32 703.07 707.32 0.000006 0.31 947.55 286.27 0.033500 281 699.30 707.32 707.32 0.000003 0.26 1111.16 330.80 0.023300 281 699.00 707.32 707.32 0.000003 0.31 988.68 252.60 0.023100 281 693.00 707.32 707.32 0.000001 0.27 1029.32 185.87 0.022900 281 694.30 707.32 707.32 0.000001 0.22 1331.27 285.92 0.012700 281 698.70 707.32 707.32 0.000001 0.23 1262.27 255.42 0.022500 281 697.30 707.32 707.32 0.000001 0.27 1459.41 225.40 0.022295 281 697.10 707.32 707.32 0.000002 0.32 1414.06 271.28 0.02

2201.69 281 697.00 707.32 707.32 0.000003 0.34 1244.80 275.54 0.022100 281 696.20 707.30 707.31 0.000022 1.27 1212.81 284.52 0.071900 281 696.62 707.30 707.31 0.000009 0.74 1417.03 342.36 0.04




Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

1700 281 696.38 707.30 707.31 0.000003 0.44 1303.59 371.23 0.031500 281 696.15 707.30 698.29 707.31 0.000006 0.60 1143.64 441.42 0.041400 281 696.00 707.30 698.21 707.31 0.000003 0.48 1515.21 512.41 0.031300 281 695.92 707.30 697.81 707.30 0.000001 0.36 1713.53 553.15 0.021200 281 695.80 707.30 697.75 707.30 0.000002 0.45 1562.81 591.53 0.021100 281 695.69 707.30 696.93 707.30 0.000001 0.27 1910.91 632.23 0.011000 281 695.80 707.30 697.76 707.30 0.000001 0.16 1764.00 288.91 0.01861 Bridge

723.28 281 695.80 707.30 697.76 707.30 0.000001 0.16 1763.95 288.91 0.01675 281 695.71 707.30 698.46 707.30 0.000000 0.16 2168.21 816.52 0.01625 281 695.14 707.30 696.39 707.30 0.000004 0.66 426.69 724.87 0.03575 281 694.57 707.30 695.82 707.30 0.000004 0.63 446.70 724.90 0.03525 281 694.00 707.30 695.25 707.30 0.000003 0.60 466.72 724.91 0.03475 281 693.43 707.30 694.68 707.30 0.000003 0.58 486.73 724.93 0.03425 281 692.86 707.30 694.11 707.30 0.000002 0.55 506.74 724.95 0.03375 281 692.29 707.30 693.54 707.30 0.000002 0.53 526.75 724.96 0.02325 281 691.71 707.30 692.96 707.30 0.000002 0.51 547.11 724.97 0.02275 281 696.00 707.30 697.02 707.30 0.000003 0.52 540.00 833.86 0.03225 281 671.00 707.30 673.70 707.30 0.000000 0.01 26512.37 998.02 0.00175 281 673.00 707.30 674.60 707.30 0.000000 0.01 27147.32 974.20 0.00125 281 667.00 707.30 667.62 707.30 0.000000 0.01 37064.91 998.58 0.00


HEC-RAS Plan: Annual low flow, sediment accumulation removed04/24/2001


Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

7650 281 730.60 732.91 732.97 0.000987 1.91 147.08 108.18 0.297497 281 730.60 732.15 732.15 732.57 0.012046 5.20 54.01 65.45 1.01

7417.66* 281 729.78 731.16 731.51 0.013054 4.78 58.74 71.83 0.937338.33* 281 728.96 730.15 730.15 730.53 0.011964 4.93 57.03 76.99 1.01

7259.* 281 728.13 729.28 729.25 729.60 0.010839 4.56 61.68 88.51 0.967179.66* 281 727.31 728.45 728.72 0.010983 4.19 67.06 96.80 0.897100.33* 281 726.49 727.57 727.84 0.011364 4.19 67.02 97.12 0.897020.99* 281 725.67 726.71 726.97 0.010595 4.11 68.41 99.63 0.876941.66* 281 724.84 725.78 725.77 726.09 0.011535 4.46 63.06 98.46 0.986862.33* 281 724.02 724.95 724.91 725.23 0.010041 4.31 65.26 100.95 0.94

6783 281 723.20 724.10 724.10 724.42 0.010398 4.55 61.76 97.94 1.016770 281 723.15 723.87 723.87 724.13 0.011622 4.13 67.97 131.09 1.01

6711.79* 281 721.66 722.62 722.62 722.91 0.011378 4.30 65.30 116.73 1.016653.59* 281 720.17 721.29 721.29 721.63 0.010790 4.66 60.25 91.71 1.016595.39* 281 718.68 719.95 719.95 720.33 0.010407 4.95 56.82 77.09 1.026537.19* 281 717.19 718.60 718.60 719.02 0.009994 5.23 53.74 65.02 1.01

6479 281 715.70 717.46 717.78 0.004957 4.51 62.34 55.54 0.756406.14* 281 715.30 717.08 717.40 0.005232 4.57 61.46 55.86 0.776333.28* 281 714.90 716.67 717.01 0.005506 4.66 60.27 55.27 0.796260.42* 281 714.50 716.26 716.60 0.005702 4.69 59.91 55.89 0.806187.57* 281 714.10 715.84 716.18 0.005896 4.68 60.10 57.77 0.816114.71* 281 713.70 715.39 715.73 0.006476 4.70 59.76 61.11 0.846041.85* 281 713.30 714.92 715.25 0.006523 4.59 61.16 65.07 0.84

5969 281 712.90 714.39 714.74 0.007492 4.73 59.40 67.01 0.895895.33* 281 712.18 713.77 714.15 0.008360 4.94 56.87 65.41 0.935821.67* 281 711.46 713.07 713.05 713.51 0.009018 5.30 52.99 58.03 0.985748.01* 281 710.74 712.34 712.34 712.82 0.009584 5.55 50.60 54.13 1.015674.35* 281 710.02 711.60 711.60 712.10 0.009459 5.67 49.55 50.83 1.015600.69 281 709.30 710.97 711.37 0.006589 5.12 54.85 49.92 0.86

5527.27* 281 708.96 710.52 710.88 0.006492 4.83 58.12 57.15 0.845453.86* 281 708.61 710.08 710.40 0.006187 4.53 61.98 64.80 0.825380.46* 281 708.27 709.64 709.94 0.006376 4.38 64.23 72.48 0.82




Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

5307.04* 281 707.92 709.30 709.52 0.004582 3.75 74.93 83.19 0.705233.63* 281 707.58 709.19 709.29 0.001664 2.56 109.92 101.47 0.435160.22* 281 707.23 709.17 709.21 0.000531 1.68 167.19 124.77 0.265086.81* 281 706.89 709.16 709.18 0.000191 1.15 244.32 149.74 0.165013.40* 281 706.54 709.16 709.17 0.000072 0.83 341.40 172.49 0.10

4940 281 706.20 709.16 709.17 0.000032 0.63 460.47 188.24 0.074903.25* 281 706.35 709.14 709.16 0.000520 1.23 228.91 145.98 0.174866.51 281 706.50 708.94 709.11 0.002501 3.37 83.36 71.04 0.55

4803.25* 281 706.22 708.71 708.85 0.005481 3.05 92.12 77.34 0.494740.00* 281 705.93 708.34 708.49 0.005020 3.07 91.42 80.41 0.514676.75* 281 705.65 707.96 708.11 0.005915 3.05 92.21 96.04 0.554613.50* 281 705.37 707.29 707.54 0.011353 3.97 70.85 93.58 0.804550.25* 281 705.08 706.98 707.10 0.003460 2.59 104.21 121.72 0.50

4487 281 704.60 706.88 706.23 706.94 0.001377 1.95 144.35 193.12 0.364390.25* 281 704.00 706.50 706.34 706.67 0.004109 3.44 85.01 157.24 0.714293.5* 281 703.40 705.84 705.68 706.12 0.005643 4.24 66.26 105.89 0.79

4196.75* 281 702.80 705.18 705.01 705.48 0.005658 4.39 64.06 97.80 0.794100 281 702.20 704.94 704.35 705.08 0.001930 3.02 93.00 119.46 0.484000 281 702.15 704.94 703.55 704.98 0.000366 1.60 175.37 147.15 0.223900 281 702.70 704.89 703.85 704.94 0.000412 1.62 172.94 165.76 0.233800 281 703.10 704.53 704.53 704.80 0.011445 4.15 67.88 180.81 1.013700 281 701.40 704.11 703.07 704.18 0.000786 2.08 141.47 148.15 0.313500 281 699.30 704.14 704.14 0.000039 0.75 378.48 139.29 0.083300 281 699.00 704.13 704.14 0.000036 0.74 378.23 123.04 0.073100 281 693.00 704.13 704.13 0.000004 0.44 638.10 84.05 0.032900 281 694.30 704.13 704.13 0.000004 0.37 763.55 146.03 0.032700 281 698.70 704.13 704.13 0.000011 0.46 606.73 162.89 0.042500 281 700.00 704.12 704.13 0.000035 0.60 470.70 209.71 0.072295 281 701.50 704.11 704.12 0.000088 0.72 387.88 260.77 0.10

2201.69 281 700.30 704.10 704.10 0.000064 0.73 387.04 202.27 0.092100 281 696.20 704.08 704.09 0.000058 0.73 387.26 184.05 0.091900 281 700.00 704.07 704.08 0.000079 0.74 380.40 227.44 0.10




Min Ch El(ft)

W.S. Elev(ft)

Crit W.S.(ft)

E.G. Elev(ft)

E.G. Slope(ft/ft)

Vel Chnl(ft/s)

Flow Area(sq ft)

Top Width(ft)

Froude #Chl

1700 281 700.20 704.05 704.06 0.000088 0.88 320.20 161.21 0.111500 281 699.00 704.03 701.10 704.05 0.000091 1.04 269.96 106.40 0.121400 281 699.60 704.03 701.26 704.04 0.000031 0.64 436.44 159.42 0.071300 281 701.00 704.03 701.74 704.03 0.000035 0.63 450.64 210.64 0.071200 281 699.00 704.03 701.85 704.03 0.000039 0.61 462.30 328.59 0.071100 281 697.50 704.02 700.10 704.03 0.000026 0.53 532.70 430.02 0.061000 281 695.80 704.02 697.76 704.03 0.000007 0.33 848.79 269.75 0.03861 Bridge

723.28 281 695.80 704.02 697.76 704.02 0.000007 0.33 848.37 269.74 0.03675 281 698.80 704.02 700.15 704.02 0.000018 0.41 686.09 507.33 0.05625 281 701.00 704.02 702.01 704.02 0.000062 0.58 485.01 732.38 0.09575 281 700.30 704.01 701.79 704.02 0.000059 0.57 503.86 857.66 0.09525 281 700.80 704.01 702.22 704.02 0.000061 0.56 521.15 912.42 0.09475 281 701.90 704.00 702.89 704.01 0.000121 0.68 419.43 902.36 0.12425 281 702.30 704.01 688.97 704.01 0.000001 0.05 1140.17 863.47 0.01375 281 703.00 703.99 699.03 704.01 0.000033 0.20 395.03 835.03 0.05325 281 698.60 704.00 689.93 704.00 0.000002 0.08 770.20 797.80 0.01275 281 703.00 704.00 686.88 704.00 0.000002 0.06 1024.23 930.49 0.01225 281 701.00 704.00 696.26 704.00 0.000008 0.19 629.56 996.06 0.03175 281 699.00 704.00 691.02 704.00 0.000000 0.00 24181.05 996.98 0.00125 281 690.00 704.00 686.02 704.00 0.000000 0.00 29954.40 997.03 0.00

LOWER ENTIAT RIVER BACKWATER HYRAULIC PROFILE EVALUATION … · Entiat Backwater Evaluation Rocky...

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