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2345 INTRODUCTION, SUMMARY AND CONCLUSIONS This is a report on an investigation of a potential salinity control project located on the Colorado River Indian Reservation, situated along the Colorado River between Parker Dam and Imperial Dam. (See Frontispiece Map). The investigation is part of the Colorado River Water Quality Improvement Program (CRWQIP), an investiga- tional program of the Bureau of Reclamation aimed at evaluating the means by which the salinity of the river can be most efficiently controlled from the standpoint of cost effectiveness and time. The CRWQIP also includes studies of a number of other potential projects to control the discharge of salts to the river, whose locations are also shown on the Frontispiece Map. Purpose and Scope The purpose of this investigation was to determine the feasibility of reducing the amount of salt in agricultural drainage entering the Colorado River each year from the Colorado River Indian Reservation. Nearly 2/3 million acre-feet of river water are diverted to the Reservation each year and drainage from the Reservation to the river contains dissolved salt. The primary thrust of the investigation was to determine the amount of the salt discharged and the feasibility of reducing the salt discharge by more efficient irrigation water use. Authority for Investigation In 1972, an amendment to the Federal Water Pollution Control Act, Public Law 92-500, set forth a public policy embracing nondegra- dation of water quality, pollution effluent discharge limitation, and eventual zero pollution discharge by 1985. The Act was interpreted by the Environmental Protection Agency (EPA) to require numerical salinity standards on the Colorado River. Standards were subse- quently established at three stations by the Colorado River Basin Salinity Control Forum, adopted by each of the Basin States, and approved by EPA [1]. The standards. set in terms of milligrams per liter (mg/L) of total dissolved solids (TDS). are: 1