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<br />+3- <br /> <br />-4- <br /> <br />hazal'ds into a~e(Ju"t whey, evaZ:.ating pkme and shaH ,mcoW"age la>>d ~se <br />appr'cpdate to the deg7'e8 of r.azaro invoi:ved. <br /> <br />long,averagesaboutthreemilesinwidth,anddrainsanareaof <br />approximately 53 square miles. Upper reaches of the watershed begin <br />at 7,620 feet mean sea level elevation and Sand Creek joins Fountain <br />Creek at aboutS,780 feet elevation. The topography is characterized <br />by rolling hills and ridges ~hich are generally steeper in the upper <br />watershed. <br /> <br />As coordinator for all water studies in the state, the Colorado Water Con- <br />servation Board establishes priorities and schedule~ these studies on a <br />priority basis. <br /> <br />The City of Colorado Springs and El Paso County participated in the <br />studybyprovl.ding: aerialphotographs,estimatesofpr"sent and future <br />flood pIain use, survey crew assistance, and funds for printing the final <br />report. Technical services by the Soil Conservation Service were funded <br />through regular agency appropriations. <br /> <br />The study area begins at the confluence with Fountain Cre€k and <br />extends upstream along the flood plains of Sand Creek and its t~o <br />major tributaries, rast Fork and Center Tributary. Total length of <br />stream reaches studied in this report is about 31 miles. The flood <br />plains vary in width from 100 to 300 feet in the upper reaches to <br />about 0.4-rnile near the confluence of Sand Creek with the East Pork. <br />A map of the flood hazard study area is shown on pa~e 5. <br /> <br />The survey, hydrologic, hydraulic, and other pertinent data and <br />eo~utations are On file with the Soil '~nservation Service, U.S. <br />Department of Agriculture, 2490l'iest26thAvenue, Denver,Colora do <br />Rti211. <br /> <br />F!oOcUJ1gSUUo.-UOM <br /> <br />GrNERAL COWDITIOIJS A."JO PAST FLOOVS <br /> <br />Except during the periods of storm runoff, the streambed of Sand <br />Creek is dry. The flood_producing storms normally occur during the <br />summer months from May through August. Runoff frOIT, IT.elting snow does <br />not contribute rr.sterially to flooding on Sand Creek. <br /> <br />DeJ~p40nCtlth€ Stud!!~J:ea <br /> <br />Sand Creek drainage b~sin, loca~ed in the west central portion <br /> <br />cfElPascCOuntr,originatestothellvrthalLJ"..s["fthcCity"f <br /> <br />Colorado Springs. Flo~'ing in a southwesterly direction, Sand Creek, <br />the East Fork of Sand Creek, and the Center Tributary pass through <br />theeasrerniimitsofColorndoSprings. Thcflood....o,terdrains <br />into Fountain Creck, a major tributary to the Arkansas Riv~r, about <br />one-half mile south of the city lirnits. The watershed is 18 miles <br /> <br />Sand Croek is typical of ~any ephemeral streams in that there is <br />tendency for the channel to meander. ~eandering takes place over a <br />period of years and is caused by storm runoff of different magnitudes <br />which result in varring de~rees of streambank and channel erosion, and <br />sediment deposition. The historical evidence ofr,eander1ng is pre- <br /><.lominate in the lowerrcaches of the watershed where there is reI a- <br />