Laserfiche WebLink
<br />adverse ground-water conditions. Selective pumping alone vou1.d <br /> <br />reduce the maximum. sal.t concentration of the Colorado River water <br /> <br />de1.ivered to Mexico during the winter months to approximate1.y <br /> <br />2,000 ppm. If selective pUIllping were used in conjunction with a <br /> <br />reduction in total. pUIllping associated with the increased cotton <br /> <br />acreage, the peak salinity during the winter months wou1.d be reduced <br />to about 1,800 ppm. TUe drains wou1.d be install.ed initiall,y on <br /> <br />about 8,000 acres to prevent potential loss of high1.y productive <br /> <br />I <br /> <br />lands when the IIIOre saline drainage wells are shut dawn. To com- <br />plete construction of Phase 1 facilities by October 1963, a <br /> <br />.' <br /> <br />supplemental. appropriation vil1. be required no later than March 15, <br /> <br />1963. Total. cost of Phase 1 is estimated to be $6,000,000. <br /> <br />Phase 2 wou1.d consist of an additional 300-cfs outlet drainage <br /> <br />conveyance channel through the Wellton-Mohawk area, possib]s some <br /> <br />additional drain tUe in selected areas, reconstruction of the <br /> <br />existing GUa River pilot channel, 12 new wells with appurtenant <br /> <br />discharge facilities in the South Gila Vall.ey, and slight modifica- <br /> <br />tion of gates at Imperial. Dam. P1Anning:f\mds for a flood-control <br /> <br />channel with protective dikes through the length of the Wellton-Mohawk <br /> <br />Irrigation and Drainage District have been appropriated to the Corps <br /> <br />of Engineers. One dike of such a chllDIlal vou1.d protect the proposed <br /> <br />,. <br />., <br /> <br />new 300-cfs outlet channel and provide a cOllllllOn right-of-wa;r for <br /> <br />both purposes. From a cost, construction,-and safety standpoint the <br /> <br />flood-control channel and protective dikes should be constructed <br /> <br />ahead of the 3oo-cfs drainage channel as a part of Phase 2. The <br /> <br />Phase 2 program would permit greater flexibility in selective <br /> <br />pumping and SUllllDer regulatory pumping to conserve stored water. <br /> <br />Hi <br />