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<br />make a la-year cOlllll11 tment to reduce winter drainage pumping of <br /> <br />highly saline water accordingly. PreJ 1 m1 nR.-r<y studies indicate that <br /> <br />the peak salinity of Colorado River water under such an operation <br /> <br />would be slightly below 2,000 ppm. This proposal offers the most <br />economical and 1JmDediate method of significantly improving the <br /> <br />qusJ.ity of winter flows in the Colorado River. It could be used <br /> <br />independently or in conjunction with any of the proposals that <br /> <br />follow. <br /> <br />As a result of studies made to date, it is recommended that a <br /> <br />three-phase construction and operational progr-am be undertaken on <br /> <br />~ <br /> <br />the Lower Colorado River, as outlined below. <br />Phase 1 provides the JOOst feasible DJathod (other than the <br /> <br />) <br />c <br /> <br />increased cotton alJ.otments) of reducing the peak salt concentration <br /> <br />in water delivered to Mex:l.co during the low flow winter months, and <br /> <br />would be accomplished through selective deep well drainage pumping <br /> <br />in the Wellton-Mohawic area. To alJ.eviate the situation by October <br />1963, we proposed to utilize, with modifications, the eXisting Wellton- <br />Mohawk drainage ch8llIlel, about 67 eXisting drainage wells, and an <br /> <br />additional 25 new drainage wells and related coJJ.ection system to <br /> <br />be constructed under a crash progr-am as soon as f'unds are avaUable. <br /> <br />With a total of 92 well.s of varying quality, there would be sufficient <br /> <br />selectivity so that wells could be pumped in a lIIIUl1ler to vary the <br /> <br />-\ <br /> <br />quality of drainage water according to the quentity of water available <br /> <br />in the Colorado River for dilution. In other words, only wells of <br /> <br />better quality would be pumped during the winter months when there <br /> <br />is lOll' flow in the Colorado River, yet sufficient total gr-ound water <br /> <br />pumping would be continuing within the District so as to prevent <br /> <br />11 <br />