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<br />(;41.:: <br /> <br />Existing Facilities <br />The above discussions and analyses have been based on the assumption <br /> <br />that all new conveyance facilities would be constructed. Obviously, <br /> <br />costs and land requirements may be reduced ff existing canals could <br /> <br />be used for conveying the recharge water to the recharge sites. <br /> <br />One of the obvious problems with using existing facilities would be <br />that diversion capacities or unused capacities may not be sufficient <br />to divert the water when available. Another~oblem arises from the <br />fact that existing canals are generally ~~~ the river than the new <br />canals would be and drain-out vOlume~~~i~~lJ?e irrigation season would <br />be greater. This would necessitatf!('the di'~ersion of greater quantities <br />, of water. Addditional acreage wfuld' be)~eded for spreading areas <br />, , <br />""... "..~ <br />for two reasons: (1) credit/~annot'lie' taken for all of the canal <br />.' 'Y <br />leakage during the 1rrig .'~"~~'aso~ since ground-water recharge is to <br />.' .............. "j.-. <br />,~ ~v <br />provide a water supply ove nd above the present supply, and (2) increasing <br />present canal leakage would interfere with regular surface water deliveries <br />during periods of no recharge or water shortages. Use of existing <br />facilities would also interrupt normal maintenance operations. <br /> <br />If all of the existing canal systems were used for the recharge operations, <br />it is estimated that about 97,300 acre-feet of water would have to be <br />diverted,to provide the farm delivery demand of 52,100 acre-feet. <br />Losses would amount to about 45,200 acre-feet and total acreage for <br />spreading areas would be about 1,310 acres. <br />