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<br />O~I?~ c:3 <br />U,.j'. J <br /> <br />are accumulated then divided by the sum of acres irrigatcd. This results in <br />a county statement of average water use per acre for a composite irrigated <br />crop. when this factor is muliplied by the number of total acres irrigated, <br />the result is an estimate of the total watet used for irrigation by county <br />under normal conditions. <br />The last factor to be calculared for each county is the impured earnin!,:s Composite <br />from irrigation water. Previously, the total earnings from irrigation was de- Sla! <br />termined. We now apply the total water use numbcr as a divisor to the total <br />earnings attributable to irrigation. The result estimates the average do\1ars <br />generated per acre.foot of water used for each county. <br />At the conclusion of this section of the analysis, the model proceeds to <br />the next county. When this happens, it also reverts to part one calculations. <br />This system is followed untll all counties have been examincd for each year. <br />In most instances an analysis problem will be addressed on the basis of Model <br />some regional delineation that is larger than" county and smaller than the epilogue <br />state. For example, we may want gross income figures or average water use <br />per acre figures from the northwest portion of the state. The next stage of <br />the model co\1ects and adjusts the second part county information into any <br />desired regional format. If this process is undertaken, it is composed of <br />whole county information except where specific readjustments have been <br />made. The results are not applicable to a crop type but are designed to pro- <br />vide a reference for understanding average irrigation impacts. The figures <br />representing total acres and water use are simply sums of those same values <br />from the county level. Figures representing average values arc calculated <br />from the accumulation and averaging of county factors. <br />With an incrcasing areal extent brought under analysis, the applicability <br />of the averaged values becomes more vague. For examplcl accumulation of <br />information concerning the income attributable to irrigation can be collected <br />on the basis of the state as a whole. Indeed, this is one of the results deter- <br />mined. When the state is treated as a single region, it must be recognized <br />from the position of running a farm, the average use figures would have very <br />little operational value. This is because of the wide ransin;; conditions faced <br />by any specific farm from the east to the western portions of the state. It <br />is, however, for the purpose of gross impact statements. convenient to have <br />this type of information avaihblc. <br />A group of results which have particular importance would be the total <br />value numbers which show the impact and magnitude of farming in the <br />whole state. For example, we can see that in 1974. which was a very good <br />year. approximately 2.8 million acres of land wcre irrigated out of 21.5 <br />million harvested acres. The average increased earnings per acre attributable <br />to irrigation was about $244. Oryland earnings, on the other hand, figure out 13 <br />