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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 <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />=687 <br /> <br />LAS VEGAS WASH UNIT - NEVADA <br /> <br />LaS Vegas Wash is located in southern Nevada southeast of <br />the city of Las Vegas. It is a natural drainage channel pro- <br />viding the only surface water outlet for the entire 2,193 squGlre <br />miles of the Las Vegas Valley. This drainage channel conveys <br />stream runoff Glnd wastcWGlter to Las Vegas Bay, an arrn of Lake <br />Mead. <br /> <br />Before urban development in the valley, the Las Vegas <br />Wash was generally a dry barren and sandy channel with flow <br />occurring only during major storms. Now, the flow has become <br />perennial due to sewage effluent, industrial cooling water, <br />urban irrigation and agricultural drainage. In addition to the <br />nutrients and salts contained in these diSCharges, the flow <br />leaches additional salts from the soil prior to entering Lake <br />Mead. The average discharge carries approximately 196,000 tons <br />of dissolved solids annually. <br /> <br />Construction according to a draft definite plan was begun <br />in 1977, but was delayed in 1978, to reevaluate the changing <br />groundwater conditions in the Lower Las Vegas Valley. The <br />objectives of the reevaluation were to identify the potential <br />for cost-effective salinity control and to formulate a practical <br />and cost-effective plan. Data has been collected and analyzed, <br />but the formulation of a cost-effective plan is contingent upon <br />the development of a wastewater management of the valley water <br />users. During the development of this plan, monitoring of <br />changes in the saline groundwater will continue. <br /> <br />A report On the groundwater investigations will be provided <br />in a status report that is scheduled for completion by the end <br />of 1981. The comprehensive wastewater management plan for the <br />valley.is to .be finished in 1981 which would provide the basis <br />for a salinity control definite plan report in mid 1982. <br /> <br />(updated 11/23/81) <br /> <br />DS:cs <br /> <br />-20- <br />