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<br />I <br />I <br />I <br />[I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I-I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />\ <br />adverse ground-water condi\ions. Selective pumping alone would <br /> <br /> <br />reduce the maximum salt concentration of the Colorado River vater <br /> <br /> <br />delivered to Mexico during the winter months to approximately <br /> <br /> <br />2,000 ppm. If selective PUlllPing were used in conjunction with a <br /> <br /> <br />reduction in total PUlllPing associated with the increased cotton <br /> <br /> <br />acref\8e, the peak ssJin1ty during the winter months woul.d be reduced <br /> <br /> <br />to about 1,800 ppm. Tile drains would be install.ed initia.l.ly on <br /> <br /> <br />about 8,000 acres to prevent potential loss of hi~iLy productive <br /> <br /> <br />lands when the more saline drainage wells are shut down. To com- <br /> <br /> <br />plete construction of Phase 1 facilities by October 1963, a <br /> <br /> <br />s~plemental appropriation will be required no later than March 15, <br /> <br /> <br />2963. Total cost of Phase 1 is estimated to be $6,000,000. <br /> <br /> <br />Phase 2 would consist of an additional 3oo-cfs outlet drainage <br /> <br /> <br />conveyance channel through the Wellton-Mohavk area, possibly some <br /> <br /> <br />additional drain tile in selected areas, reconstruction of the <br /> <br /> <br />existing Gila River pilot .channel, 12 new wells with appurtenant <br /> <br /> <br />discharge facilities in the South Gila Valley, and alight mod1:f'ica- <br /> <br /> <br />~lun of gates a1; llIIperle.J. Dam. Planning f'unds :for a flood-control <br /> <br /> <br />channel with protective dikes through the length of the Wellton-Mohaw <br /> <br /> <br />. Irrigation and Drainage District have been appropriated to the Corps <br /> <br /> <br />of Engineers. One dike of such a channel woul.d protect the proposed <br /> <br /> <br />new 3oo-cfs outlet channel and provide a cOllllllOn right-of-w~ for <br /> <br /> <br />both purposes. From a cost, construction, and safety standpoint the <br /> <br /> <br />flood-control channel and protective dikes should be constructed <br /> <br /> <br />ahead of the 3oo-c:fs drainage channel as a part of Phase 2. The <br /> <br /> <br />Phase 2 program would permit greater :flexibility in selective <br /> <br /> <br />PUlllPing and s\lJlllller regu1.atory PUlllPing to conserve stored water. <br /> <br />11i <br />