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<br />PO<ldr~ River basin "hich meet this crttHla ate Fo~sl1 Creek "ear Fort <br />Collins and Sheep Dr.." near Creelu)'. LocAl I<\ter"~ts also a""is"ed <br />th"se Qtresm.q pr lor It)' (<>rstud)'. Volulll" III of the spec1al Stud)' <br />covers Sheep Ora" and Volume IV covers Fossil Cte~k. The locattuns of <br />these Ms1na ,,~e sho"n on plate 1. <br /> <br />The present study...sa hJ.sed on ncw t<>pogrsphic "",pp1ng and crOB' <br />sections ~akcn at closet intervals than In the Flood In.urllnce Stud)' <br />(FIS). Also, the study reach 0<\ Sheep Ora" "as extended farther <br />upstream than .In the FrS "hich ended at U.S. ijigh"ay 34. In this <br />study, the Enviton.."ntsl Prot.ectionAgency'. (EFA) Stor....stHMal\ilge- <br />ment Model (S\ImI) ,,"s used to det<l!ldne flood discharges. Peak <br />discharges for flood. of various freq\lencywerecolDputedu8.lngthe U.S. <br />Soil Conserv&tfon Service (SCS) TechnIcal Release No. 20 cOlDputer <br />program in the FIS. The lOO-yeat flood discharge for the preaent atudy <br />averages about 90 percent of the d!scharge used in the FIS. Downstream <br />from County Road 29 (71st Avenue), the laO-year floodwater aurface <br />profile for the present study generally ranges from 1 to 5 feet higher <br />than In the FIS "ith the depth variations increasing in the do...natream <br />direction. Upstream ftom County Rosd 29, the lao-)'ear flood profile In <br />the present study generally varies leaa than a foot above or below the <br />IOO-yest profile in the FIS. <br /> <br />Hydtologtc ~deling studIefl were conducted to dete~ine the pea~ <br />~iachargea for flooda of various probab1litiea of occurrence. ThIS <br />information was developed fIrst fot exIating watershed land use. To <br />determine the effect of increasing urbanization on flood runoff, <br />poaaIble future urban land use was s"perimposedon the Sheep Dr"" <br />badn. Vol""", II of thb at"dy pr"aenu de:dls of the hydrologic stud- <br />Ies. Ilydraulic modelin~ atudies were conducted to develop the flood <br />water surface profiles and flood plain boundaries. Flood profiles are <br />shown for existing and future condit!ons. Flooded uron maps are shown <br />fot existing conditIons. <br /> <br />ACKNOWLEDGEMENTS <br /> <br />LOCATION OF DATA <br /> <br />Principal coope~"tion and '~oordloat.l(}(l for Volume III was with <br />representatives of the Federal Emer~ency Mena~e~nt Agency (FEMA), the <br />Colordd,,\;ste< Cunaen..llo"ilo#;,Q (CilCS), ;;"i<lC"",""y, dlld the elty of <br />Greeley. <br /> <br />Copies of this report are available for puhlic distrihution at the <br />offiee~ 118t~d b~low. Topographic, hydrologIC, and hydraulic data used <br />In this study are also on file in the Flood Piain Ha,~g~~~nt S~rvl~~H <br />Branch, Omaha Diatrict Corps of Englneera. 21~ North 17th Street, <br />OlDaha, NE 68i02. <br /> <br />Sheep Dr~w was Included in the report Flood In$urance Study, Weld <br />County, Colorado, Unincorporated Areas and Town of Eaton, Colorado, <br />Weld ~ount1., publlshed by FEMA .In Dece..ber 1979. Ihh study Includ~d <br />Flood Boundary and Floudway Maps (FBFM) nnd FIQod Insurance Rate Maps <br />(FIIlM), with an <>ffecti..e date of 18M"rcht980. <br /> <br />Department of PlannIng Setvlces <br />~eld County Centennial Center <br />9lS10thStrcet <br />Greeley, CO 80631 <br /> <br />RELATED STUDIES <br /> <br />Countyt:ngln"er <br />WelJCounty <br />P.O. Box7SS <br />G~e~lcy, co 80631 <br /> <br />, <br /> <br />; <br />