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<br />o <br /> <br />~-f'" <br />:.':..... <br />.,;. , <br /> <br />W <br />N <br />-,J <br /> <br />1'7 <br /> <br />and illustrate the undependable nature of the water <br /> <br />supply available to the irrigators. Total irrigation <br /> <br />season diversions average about 152,000 acre-feet, but <br /> <br />they have ranged from as little as 52,000 acre-feet to <br /> <br />as much as 222,000 acre-feet. Total diversions during <br /> <br />November through March average about 9,500 acre-feet. <br /> <br />To serve as a check for reliability of computed <br /> <br />diversion requirements, they were plotted against his- <br /> <br />toric diversions during months when John Martin Res- <br /> <br />ervoir contained sufficient storage to satisfy all <br /> <br />demands for releases of stored water. The graph is <br /> <br />shown in figure 1. It reveals that no relationship <br /> <br />exists between the two parameters during the months of <br /> <br />April, May, and October, but a trend is apparent during <br /> <br />June, July, August, and September. The following <br /> <br />rationale can be used to explain the hypothesis that <br /> <br />the actual headgate diversion requirements are 89 per- <br /> <br />cent of the calculated requirements. All points for <br /> <br />June through September fall on or below the assumed <br /> <br />relation because some water was obtained from other <br /> <br />sources even during the best of years, and the indi- <br /> <br />cated water shortages did not occur. These sources may <br />