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<br />. <br /> <br />. <br /> <br />.i?eG/E-o/@cJ /./2,/8S:- <br />/f,.'L <br /> <br />~, <br /> <br />" <br /> <br />BANKFULL FLOW DETERMINATION FOR <br />OURAY REFUGE, CLEOPATRA'S COUCH, WALTER WALKER AND MAYBELL <br />PHABSIM SITES <br /> <br />Introduction <br /> <br />All flows affect channel form t~ some degree. The channel- <br />fDrmfng effectiveness of a given dfscharge is determined by the <br />magnftude and the frequency of occurrence of the discharge. The <br />most frequent flows are moderate and transpDrt relatfvely small <br />amounts of sediment. Infrequent, large discharges transport <br />large amounts of sediment but it is the Intermedfate sfzed dfs- <br />charge which transports moderate amounts of sediment and occurs <br />frequently which forms the channel. Bankfull flow (Pb), the <br />discharge whIch fills the channel to capacity such that any <br />additional flow will cause overbank flooding, is a physical <br />index of the most dominant range of channel-forming flows. <br /> <br />The Objective of this study was to determine the magnitude of <br />bankfull flows for four PHABSIM sites in the Upper Colorado <br />River Basin: Walter Walker (Colorado River), Ouray Refuge <br />(Green River), Cleopatra's Couch and Maybell (Yampa River). <br />HfstDrical records of the proximate gages to these sftes were <br />used in this determfnatfon. The gage records were not divfded <br />as to water resource development hfstDry of the subject river <br />basin. <br />