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<br />I <br />A.. <br />"*~ <br />.,.....,., <br /> <br />f' <br /> <br />Reservoir Operation <br /> <br />) <br /> <br />Based on the irrigation demcc.nJ shown in Table 5, the <br /> <br />s~lry of reservoir operation for the Lemon reservoir site at a <br /> <br />usable, or net capacity of 20,000 acre-feet, is shown on Table 9. <br /> <br />At an altitude of 8,100 feet eV8.poration will be small. <br /> <br />The greater part of each reservoir basin is nOIT in wide, open river <br /> <br />channel, marsh, or meadow hay with a rate of evaporation comparable <br /> <br />to that of the water surfaces of the reservoirs, Bank storage and <br /> <br />summer rains should offset the evaporation duril1E; draw-down periods, <br /> <br />Usable storilg6 of 20,000 acre-feet would r"sult at either <br /> <br />I~~ <br />.7;,~~'f <br />%: <br /> <br />site with shortage for the years 1928, 1931" emd 193~., the latter <br /> <br />amounting to about 40% of the total demand at oither site and the <br /> <br />shortage for the other two years being nominal, Reducing the reser- <br /> <br />voir capacity to 18,000 acre-feet would increase all these shortl'.ges. <br /> <br />The <ldvance sheet showing stroam flow for 1937 indicates that 20,000 <br /> <br />acre-feet of stored water Vlore n8aded. <br /> <br />No reservoir c,~, as [l pr,"cticr,l matter, be operated with <br /> <br />the perfect efficiency assumed in these computations. A gross capa- <br /> <br />city of 23,000 acre-feet has been adopted for the plans and estim~tes <br /> <br />as sufficient to give tho effective yi01(" of 20,000 p,cre,.feet. <br /> <br />44 <br />