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<br />2348 <br /> <br />for improved irrigation efficiency will apparently be achieved on the <br />Reservation without a Federal salinity control project. Con,sequently, <br />further investigation of the Colorado River Indian Reservation Unit is <br />not justified at this time. <br />Specific conclusions regarding further study of the Colorado <br />River Indian Reservation Unit are as follows: <br />1. The Colorado River Indian Reservation Unit should be <br />deferred from further consideration under the Colorado <br />River Water Quality Improvement Program at this time. <br />2. The Intensive Salinity Surveillance Program should continue <br />to monitor the Reservation's salt inflow and outflow. <br />Cooperation and Acknowledgments <br />This investigation was entered into as a cooperative venture with <br />the U. S. Soil Conservation Service, as established by a Memorandum <br />of Understanding between the Service and the Bureau of Reclamation <br />pursuant to Public Law 93-320. The State office of the Soil <br />Conservation Service in Phoenix, Arizona, and the Western Technical <br />Services Center at Portland, Oregon participated by drawing up plans <br />for investigating onfarm management practices, and providing consul- <br />tation on aspects of irrigation water management. <br />The U. S. Bureau of Indian Affairs, Colorado River Agency <br />provided information on irrigation operations and water quality, and <br />provided valuable insights into the operation of the water distribution <br />systems. <br />The services of Boyle Engineering Corporation. Phoenix. Arizona <br />were used to compile information on irrigation and drainage, to esti- <br />mate efficiencies, and to make preliminary analyses of the effective- <br />ness of water system improvements to reduce salt discharge to the <br />river. <br />Personnel of the U . S. Salinity Laboratory at Riverside. <br />California advised on soil chemistry and salt balance relationships. <br />The U. S. Geological Survey has previously made studies of the <br />geohydrology of the Colorado River Valley, and those studies pro- <br />vided the foundation for much of the analysis in this report. <br /> <br />4 <br />