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tIT ( <br />tip nl e tates Department of the Interior <br />IM ^ <br />_ BUREAU OF RECLAMATION <br />?4RCH 3 Reclamation Service Center <br />P.O. Box 25007 <br />IN REPLY RFFER TO: Building 67, Denver Federal Center <br />Denver, Colorado 80225-0007 <br />D-8530 <br />PRJ-13.00 JUN 1 8 1996 <br />MEMORANDUM <br />To: Joseph Lyons, Hydraulic Engineer <br />Technical Service Center <br />Water Supply, Use, and Conservation Group <br />From: Thomas A. Pick, Hydraulic Engineer <br />Technical Service Center <br />Flood Hydrology Group <br />Subject: Peak Flood Flow Computations, Green River Tributaries below <br />Flaming Gorge Dam, Colorado - Utah <br />The attachment is in response to your request to compute peak flow frequency <br />information for major tributaries to the Green River in Utah. <br />For the stations with major upstream reservoirs, especially the Duchesne River <br />with four upstream reservoirs, no attempt was made to remove the effects of <br />regulation and study the unregulated peaks. The assumption is that the existing <br />gauge record adequately reflects all the effects of regulation and that the log <br />Pearson Type III distribution is the proper distribution. <br />o <br />If these assumptions are not valid, then the resulting curves and computed return <br />period flows for these stations may be substantially in error. <br />The attachment was peer reviewed by Kenneth L. Bullard of the Flood Hydrology <br />Group. <br />Feel free to call me at 236-0123, Ext. 248, if you have any questions on the <br />enclosed responses. <br />W <br />G4 <br />Attachment <br />cc: D-8530, D-8530 (Pick)