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<br />14 <br /> <br /> <br />0029 <br /> <br />It was assumed that any time the flows exeeeded 3500 c.f.s. <br /> <br />flood conditions prevaUed and the use of direct diversions for <br /> <br />irrigation may be eurtailed either because of the heavy sediment <br /> <br />load in the stream or the danger of damage to headworks or a <br /> <br />eombination of both. Flows between 3,000 to 4,000 e.f.s. occur <br /> <br /> <br />about 0.1 to 0.2 percent of the time as determined from the flow <br /> <br />duration eurves. <br /> <br />Historieal flows at the HollY' gage from October 1920 through <br />September 1953 and the Coolidge gage from Oetober 1953 through <br />September 1956 averaged 185,000 acre-feet per year. When the <br /> <br />flows in excess of 3500 c.f.s. were deducted the remaining average <br />annual diseharge dropped to 136,000 acre-feet. This indicates <br />that about 49,000 acre-feet annuallY' would be lost for direet flow <br /> <br />irrigation use. These so-ealled excess flows were very large in <br />some years and nonexistent in other years. Some of the larger <br /> <br />excesses are as follows: <br /> <br />1921 460,000 acre-feet <br />1923 163,000 acre-feet <br />1927 161,000 aere-feet <br />1936 129,000 acre-feet <br />1942 518,000 acre-feet <br /> <br />If storage faeilities were available, portions of these flows <br /> <br /> <br />eould have been put to beneficial use. It would be unlikely that <br /> <br />storage capacity could be buUt to control all the flows in excess <br /> <br />of 3500 c.f.s. Storage eapacity construeted above Garden City <br /> <br />could regulate and control a portion of these exeess or surplus <br /> <br />flows . <br />