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Salt Removal Effects 002969 Concentration Tons of Salt Reduction at Removed Imperial Dam Removed by per Year (mg/L) Initial Units (authorized 634,000 73 for construction) Point Sources 433,000 49 I rrigation Sources 483.000 56 Diffuse Sources 437,000 37 Total 1 ,987,000 215 Unit effects on salt removal and salinity reductions are summarized in the table for the four initial units as well as the other 13 potential source controls authorized for feasibility study. Removing about 2.0 million tons of salt annually repre- sents a concentration reduc- tion of about 215 mg/L at Imperial Dam under con- ditions of development an- ticipated by 2000. Because the Colorado RivN Water Quality Improvement Pro- gram is only one part of the water resou rces manage- ment of the Colorado River Basin, additional salinity control efforts may be needed to meet the long- term objective of removing 2.8 million tons annually. Proper design of water de- veiopment projects and im- plementation of State and local salinity control meas- ures are vitai to management of water supply and water quality in the basin. Las Vegas Wash as it enters Lake Mead o u.s. GOVERNMENT PRINTING OFFICE: 1978-778-233/134 REGION NO.8 The Future Future consumptive use of water will have the most direct impacts on river salin- ity. As a general rule, for each 10,000 acre-feet of water removed from the upper river system, or for every 10,000 tons of salt loading. the salinity at Im- perial Dam will increase about 1 mg/L under present or near-term conditions. Future program efforts wil emphasize early completic of cost-effective unit con- trols. In addition, basinwid computer modeling studie: will assess potential water resources development an, additional salinity control techniques as well as eval- uate futu re Federal and State water management alternatives. Numerous mineral springs occur in the basin Concrete.llned irrigation ditch reduces seepage. making more efficient use of water Additional Information Additional information may be found in the "Finai Envi- ronmental I mpact State- ment, Colorado River Water Quality I mprovement Pro- gram." Information requests should be directed to the Bureau of Reclamation, Qolorado River Water Qual- ity Office, Building 67. P.O. Box 25007, Denver Federal Center. Denver. Colo. 80225.