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<br />:.:> <br />,..) <br />co <br />o <br /> <br />The Bureau of Reclamation and the Bureau of Indian Affairs are <br />cooperating in the irrigation scheduling and management program. There <br />are about 2,000 acres on the reservation under irrigation scheduling <br />this year. The program is to continue through fiscal year 1977 with <br />Bureau of Reclamation supervision. <br /> <br />Palo Verde Irriqation District Unit <br /> <br />There are about 90.000 acres irrigated in the locally developed district <br />along the Colorado River in California. The irrigation return flows <br />from this district are estimated to contribute about 90.000 tons of salt <br />per year to the river. The combined effect of this program and the <br />system improvement and management should be a reduction of 23,000 tons <br />in dissolved solids per year. The corresponding reduction in salinity <br />concentration at Imperial Dam is 5 mg/l. <br /> <br />The irrigation scheduling service is expected to be applied to 3,000 <br />acres by the end of 1973 and will be expanded to serve 10.000 acres in <br />1974. The program is proposed for continuation through FY 1977. <br /> <br />Water System Manaqement and Improvement Division <br /> <br />Colorado River Indian Reservation Unit <br /> <br />The water system management and improvement is closely tied to the <br />irrigation scheduling and management program and the figures quoted in <br />the previous sections in regard to potential salt loading reductions <br />are based upon an integrated application of both programs. The feasi- <br />bility investigations for this unit are scheduled through fiscal year <br />1976. <br /> <br />Palo Verde Irriqation District Unit <br /> <br />It is proposed to study the feasibility of improving the on-farm unlined <br />irrigation laterals by lining or replacing them with buried pipe. The <br />irrigation distribution system is in generally excellent condition. <br />therefore this study is limited in scope to the on-farm distribution. <br />This would be a supplement to the irrigation scheduling and management <br />proposed for this unit. The feasibility investigation is scheduled to <br />start this fiscal year and be concluded in FY 1975. <br /> <br />Salinity Division <br /> <br />The reach of the Colorado River main stem between Parker Dam and Imperial <br />Dam exhibits some unexplained high salinity concentrations at times. <br />especially at low flows. Some data have been collected in an attempt <br />to identify and quantify the sources of this salt loading. An analysis <br /> <br />-10- <br />