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<br />and are scheduled to be completed in FY 1976. <br /> <br />W <br />l\:. <br />(,,11 <br />(,:., <br /> <br />~as Veqas Wash Unit <br /> <br />Las Vegas Wash serves as a surface drain for all domestic, municipal, <br />and industrial wastewaters from Las Vegas Valley. The average annual <br />discharge from the Wash to Lake Mead is about 38,000 acre-feet which <br />carries approximately 208,000 tons of dissolved solids. Because of the <br />rapidly increasing population of the Valley, the annual discharges of <br />water and salt are expected to increase several fold in the next few <br />decades. <br /> <br />The Clark County Board of Commissioners has been given responsibility <br />for developing a pollution abatement program for the Wash. The Board <br />has. in turn. requested that the Bureau of Reclamation initiate studies <br />toward salinity control of the Wash. An appraisal report is scheduled <br />for completion by January 1. 1974. which will present an assessment of <br />the situation and outline possible approaches to coordinating a salinity <br />control program with the County's proposed pollution abatement project. <br /> <br />Blue SprinG Unit <br /> <br />This spring rises in the Little Colorado River about 13 miles upstream <br />from its confluence with the Colorado River. The spring is the largest <br />point source of salinity in the entire system with an output of 220 cfs <br />and 550.000 tons of salt per year. <br /> <br />Investigations of a control program have not been encouraging to date. <br />The Little Colorado River is entrenched within a steep canyon at a <br />depth of 2.500 feet at this point. The comparatively large flow. the <br />scenic setting. and the special ethnic value to the local Indians are <br />additional complicating factors. An appraisal report summarizing the <br />control alternatives examined will be completed this year and will serve <br />as a basis for deciding whether additional investigations are warranted. <br /> <br />Irriqation Schedulinq and Manaqement Division <br /> <br />Colorado River Indian Reservation Unit <br /> <br />The Colorado River Indian Reservation is located on both sides of the <br />Colorado River on the Arizona-California border downstream from Parker <br />Dam. There are about 55.600 acres irrigated at the present time and <br />this is projected to increase to 99,400 acres by 1980. These lands are <br />estimated to contribute 30,000 tons of salt annually to the Colorado <br />River. It is anticipated that this salt load could be reduced by 7.000 <br />tons through the irrigation scheduling and management and the water <br />systems improvement and management programs which would result in a salt <br />concentration reduction of 2 mg/1 at Imperial Dam. <br /> <br />-9- <br />