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<br />Hydrology <br /> <br />has contributed greater uncertainty to the Model water supply. <br />Additional sedimentation reduces the storage space each year. <br />Therefore, the Model supply will become even more uncertain as <br />time goes by. <br /> <br />Because supplies have been undependable, a large part of the <br />historic diversions were made at timeG when not actually needed to <br />meet reQuirements for crop growth. Thus, the practice of over- <br />diversion has prevailed even though the water supply for the area <br />has been critically short, The historic operation study showed <br />that total annual diversions averaged 53,200 acre-feet. Of this <br />total, however, the diversions made to coincide with actual crop <br />re~uirements averaged 37,300 acre-feet. The remaining diversions, <br />amounting to 15,900 acre-feet per year, were made in excess of <br />crop reQuirements. The results of the historic water utilization <br />studies are summarized in the following table. <br /> <br />Table 5.--Historic water utilization <br /> <br />(acre-feet) <br /> <br /><," <br /> <br />.1 <br /> <br />Item <br /> <br />Average <br />1925-l957 <br /> <br />':-: <br /> <br /> <br />Project diversion reQuirement <br /> <br />61,200 <br /> <br />",.,.", <br /> <br />Project diversions: <br />To meet crop reQuirements <br />In excess of crop reQuirements <br />Total <br /> <br />37,300 <br />15,900 * <br />53,200 <br /> <br />. . <br /> <br />Apparent shortages (61,200-37,300) <br /> <br />23,900 <br /> <br />* Part of the diversions may have been used for <br />stockwater; part would be available as carry- <br />over soil moisture to meet subseQuent <br />reQuirements. However, most of these excess <br />diversions have been of no value to the <br />project area. <br /> <br />. ,,-,.')-' <br /> <br />16 <br />