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<br />(:::,:1 <br /> <br />a <br />::> <br />Coo.) <br />;.:) <br />c..J <br />~ <br /> <br /><~ <br /> <br />24 <br /> <br />develop an equation that would allow estimation of <br /> <br />return flow from various related parameters using the <br /> <br />multiple regression analysis package that was available <br /> <br />for the NCR Century 200. The amounts of return flow <br /> <br />during historic conditions for use in the regression <br /> <br />were estimated from monthly water budgets by deducting <br /> <br />releases at John Martin Dam from the sum of the combined <br /> <br />headgate diversions in Water District 67 and the state- <br /> <br />line flow. No reliable regression equation was deter- <br /> <br />mined, and the parameters that were found to be statis- <br /> <br />tically significant were ones that were not varied <br /> <br />during the simulations. Therefore, the return flow <br /> <br />values shown in table 18, which were determined from <br /> <br />historic conditions, were used during the simulations. <br /> <br />The headgate diversion shortages calculated in the <br /> <br />model are not strictly comparable with the historic <br /> <br />diversion shortages. The historic practice of over- <br /> <br />irrigation, or the application of more irrigation water <br /> <br />than is required, during the early months of the irri- <br /> <br />gation season builds up the soil moisture in the plant <br /> <br />root zone. and a portion of that moisture is carried <br /> <br />over to the later months for use by the plants when a <br />