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<br />0.1 <br />CCl <br />00 Project Requirement <br />C'J <br /> <br />The average rainfall on project lanes during the growing <br /> <br />season (May to September, inclusive) is 6 inches, reducing to 3 inches <br /> <br />in dry years. With a eiversion of 3.5 acre-feet of irrigation water, <br /> <br />this makes for a total irrigation season water supply of 3.75 acre- <br /> <br />feet per acre in dry years. Water consumed by plants and evaporated <br /> <br />by the soil is estimated from data on consumptive use for the Garland <br /> <br />Division of the Shoshone Project with similar climate and crops, at <br /> <br />2 acre-feet per acre for the irrigation season, resulting in return <br /> <br />flow to the streams of 1.75 acre-feet per acre of unused water. <br /> <br />Probably over half of such return flow represents canal losses which <br /> <br />should be about 351. of the diversions or 1.22 acre-feet per acre. <br /> <br />The balance is surface waste and water applied in excess of con- <br /> <br />sumptive use. One-half of the total return flow will appear below <br /> <br />the project land. To the extent that this water helps to fill the <br /> <br />requirement of downstream land it assists in meeting the project <br /> <br />requirement. Of the balance aBounting to .88 acre-feet per acre, <br /> <br />about 7~ may be expected to be available and actually used in the <br /> <br />irrigation season. <br /> <br />The resulting project demand will then be as follows: <br /> <br />35 <br />