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<br />19 <br /> <br />. : . ~-~ ._:l. <br />. ".:'" <br /> <br />o <br /> <br />...... <br /> <br />~I <br /> <br />diversions during the six irrigation seasons in which <br /> <br />~ <br />(':1 <br />l'V <br /><:c <br /> <br />there was an adequate water supply were combined with <br /> <br />USGS2 estimates of ground water withdrawn by irrigation <br /> <br />wells that were adjusted by proportioning and compared <br /> <br />with the adjusted diversion requirements. The compari- <br /> <br />son is shown in table 4. <br /> <br />It confirms that even in the <br /> <br />best of years the farmers have used their wells, proba- <br /> <br />bly as a matter of convenience, and supports the <br /> <br />adjustments to the computed requirements by showing <br /> <br />that the combined water supply satisfied the require- <br /> <br />ments during each of these years. <br /> <br />Therefore, the headgate diversion shortages shown <br /> <br />in table 17 were calculated by deducting the adjusted <br /> <br />water requirements from the historic diversions. These <br /> <br />shortages are the amounts of water that must have been <br /> <br />obtained from a supplemental source to avoid reduced <br /> <br />crop yields. Annual diversion shortages determined in <br /> <br />this manner have averaged about 80,000 acre-feet during <br /> <br />the study periOd. The maximum was 195,000 acre-feet <br /> <br />during 1964. As one would expect the average shortage <br /> <br />is smallest during April when it is only 500 acre-feet. <br /> <br />August is the month of largest shortage with an average <br /> <br />of 22,000 acre-feet. <br />