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<br /> <br />. <br /> <br />. <br /> <br />,'s that would p:' <br /> <br /> <br />ne lower end. of i.. <br /> <br />'\Ie ni:.:'"'le Ci'"eek near Rifle frequency <br />'1&1'\.481 Ihaximum curves shown is influenced <br /> <br />a "owmelt and generfL~ ,',,~nfloods. <br /> <br />. <br /> <br />Aft, unit graph and loss rates were ad~usted so as to give reasonable <br /> <br />flooo ','s, co:npared to the historical events, then t[.e unit hydrograph <br />was converted to a stww.ation graph (S-graph). ~his S-graph was then <br />used to develop unit hydrographs for the basins being studied. It <br />should be mentioned that the storms for the 50-year frequency and smaller <br />could not cover the entire basin. It was found that with the loss rates <br />used, a lO-year storm could only effectively cover about 5 'square miles. <br />Therefore, the lO-year cloudburst flow would be essentially the same <br />for any storm center:lng, except for differences in base flow (and <br />reservoir releases in the case of Rifle Cree;;' below the dam). It was <br />found that with the storm centered over Government Creek only about <br />50 square miles of area above Rifle Gap Dam would be contributing for <br />the 100-year to 500-year events. <br /> <br />Cloudburst runoff canputed at the desired index points were plotted for <br /> <br /> <br />frequency curve development. The frequency curves were then drawn " <br /> <br /> <br />through these points and then adjusted in the lower end to account <br /> <br /> <br />for other types of floods (snowmelt and general rain). A copy of <br /> <br /> <br />frequency curves is inclosed. <br /> <br />;Flows in the Colorado River at Rifle were derived by interpolating between <br /> <br />available data at upstream and downs'.;r~am stations (DA versus flow <br /> <br />5 <br />