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<br /> <br />. <br /> <br />.,"., 1'" l~ ~. <br />..hJ''J; l. <br /> <br />Water supply <br /> <br />No historical streamflow records of the Fryingpan River are <br />available at the Ruedi Dam site. However, river flow records are <br />available at the former Thomasville gaging station about six miles <br />upstream from the damsite, for a ten-year period--191lto 1920. The <br />Thomasville gaging station commanded a drainage area of 175 square <br />miles as contrasted With a 228 square mile area above the Ruedi Dam <br />site. During previous investigations in recent years the undepleted <br />flow of the Fryingpan River at the Ruedi Dam site was computed for a <br />34-year period--19ll to 1944. In this computation the Ruedi flows <br />were estimated by drainage area relationship and correlation with <br />recorded flows at Thomasville and with records on the Roaring Fork <br />Ri ver at Glenwood Springs. <br /> <br />Streamflow records also are available for the. Flj'ingpan <br />Ri ver at Norrie and on the North Fork of the Fryingpan pear Norrie <br />from 1947 to the present time. Norrie, Colorado is situated about <br />ten miles upstream from the Ruedi Dam site and commands. a drainage <br />area of 131 square miles. Ri ver flows at Ruedi were estimated by <br />correlation with Norrie records for the period 1945 to 1957. <br /> <br />. <br /> <br />Combining the estimates for the overall periodu1911 to <br />1957--annual undepleted streamflows at Ruedi averaged 195,900 acre- <br />feet, ranging from a low of 66,700 acre-feet in 1934 to a high of <br />341,200 acre-feet in 1957. <br /> <br />Depletions <br /> <br />Except for negligible irrigation use of water on the western <br />slope for which data are not available, the major depletions to the <br />Fryingpan River above Ruedi will result from the existing Busk- <br />Ivanhoe diversions to the eastern slope and from the potential Frying- <br />pan-Arkansas Project diversions. Combined, these diverSions are <br />expected to average 74,100 acre-feet annually for the 1911-1957 <br />period of study. Of this amount, 94.7 percent or 70,200 acre-feet <br />would be diverted from the Fryingpan River drainage above Rued!. <br />Deducting the depletion from the undepleted streamflowsat the Ruedi <br />Dam site, leaves a depleted reservoir inflow at Ruedi averaging <br />125,700 acre-feet annually and ranging from 63,200 acre-feet in a dry <br />year like 1934 to 234,900 acre-feet in a wet year like 1957. <br /> <br />. <br /> <br />19 <br /> <br />