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<br />. <br /> <br /> Table VII-2. Point source salinity control projects. <br /> . <br /> ProBram Effect at <br /> Salt/year reduction Hoover Dam <br />w::.. ~ tonaNr. pom <br />0 <br />01 LaVerkin Springs 100,000 100,000 - 6 . <br />en <br /> LittleField Springs 30,000 30,000 - 2 <br /> Glem/ood-Do 101:'es Springs 500,000 200,000 -15 <br /> Paradox Valloy 200,000 180,000 _llf . <br /> Crystal Geyser 4,000 4,000 _ 1. <br /> (oil test l~en) <br /> Blue Springs 550,000 0 <br /> . <br /> <br />of 160, 000 acre feet of water, or half the Little Colorado, (2) inacces- <br /> <br />sibility, and (3) existence of Indian folklore in the area. The total <br /> <br />. <br /> <br />point source program would reduce ,salt concentration by 38 ppm at <br /> <br />Imperial Dam. <br /> <br />. <br /> <br />Diffuse source control.' The diffuse source projects listed in <br /> <br />Table VII-3 pose difficult data and control problems. The areas are <br /> <br />heavy contributors of salt. To achieve -32 ppm apparently would re- <br /> <br />. <br /> <br />quire substantial costs and losses of water. <br /> <br />Irrigation source control. Point and diffuse proposals would <br /> <br />. <br /> <br />achieve a reduction of 70 ppm at Imperial Dam. This places the major <br /> <br />reduction burden on irrigation -- 335 ppm of a total program of 405 <br /> <br />ppm. Investments, economic sanc~ions, standards and rules, educa- <br /> <br />. <br /> <br />tional programs, legislation, and other institutional arrangements <br /> <br />L8 <br /> <br />. <br />