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<br />l <br />I , <br />I <br />I \. ; <br />I <br /> ! \ <br /> I <br />I <br />i \,> <br />i <br />, <br />I <br /> C <br /> !"-. <br /> ;'_1 <br /> r, <br /> ,~' <br /> r~ <br /> ",,.' <br /> <""""~, <br /> <.".' <br /> ..~ <br /> '<oJ <br /> r: <br /> ~ <br />" <br />~ <br />:~ .-,\ <br /> .... <br />! <br /> "'" <br /> .....~' <br /> C~ <br /> /"' <br />< \,( <br /> "" <br /> .~ <br /> ,'-" <br /> "'f'" <br /> f~, <br /> ~~' <br /> " <br /> ~..;~' <br /> {:'-~. <br /> 'to..';:' <br /> !# <br /> ~. <br /> <br />6. Flow-frequency anal~sis - Peak flow-frequency curves wer,e <br />prepared for each index point using the analysis of streamfl,,'. <br />datEL and the rainfall-runoff computations discussE,d in the following <br />par~,graphs . <br /> <br />An examination of the streamflow rE,cords in the Yampa Ri'ler basin <br />ShOll'S that most of the annual peak flo"s are produced by sno'oIl1lelt. <br />Therefore an analysis of these records yield flow--frequency I~urves <br />whic:h reflect primarily snowmelt conditions. It should be rl~l:ognized, <br />howE<ver, that rainfloods can occur in the Yampa River basin. The June <br />1921. and April 1974 floods were caused by a combination of sn".nnelt and <br />a geineral rain condition over the entir,e basin. In addition to the <br />genc.ral rain type storms Summer cloudbursts can oc:curin the basin. <br /> <br />The snowmelt portions of the flow frequency curves at the ungaged <br />loc8.t:ions were defined using an analysis of peak flow data at: 15 <br />loc8.tions within the Yampa River basin. Those stations with r,'ore than 10 <br />years of record were selected for analysis.. The e:tations used and the <br />computed statistical paralneters are shcn.l1 in the. following t~,ble. <br /> <br />S' <br /> <br />f' <br />