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<br /> <br />CONTENTS-Continued <br /> <br />Page <br /> <br />Diffuse Source Control . . . . <br /> <br />106 <br /> <br />Big Sandy River Unit, Wyoming <br />Price, San Rafael, and Dirty Devil River Units, Utah <br />McElmo Creek Unit, Colorado <br /> <br />107 <br />107 <br />111 <br /> <br />Return Flow Utilization <br /> <br />113 <br /> <br />Grand Valley Collector System, Colorado <br />San Juan Collector System, Colorado and New Mexico <br />Palo Verde Irrigation District, California .... <br />Colorado River Indian Reservation, Arizona-California <br />Other Sources of Cooling Water <br />Environmental Considerations <br /> <br />114 <br />114 <br />114 <br />114 <br />116 <br />116 <br /> <br />V. Research <br /> <br />117 <br /> <br />Ion Exchange <br />ARS-BR Irrigation Efficiency Study <br />Consortium of Water Institutes and Centers <br />Agricultural Experiment Stations-USDA Cooperative Research <br />Lake Powell Studies-National Science Foundation <br /> <br />117 <br />117 <br />118 <br />120 <br />120 <br /> <br />VI. Cooperating Entities . . . . <br /> <br />123 <br /> <br />Bureau of Land Management <br />Department of Agriculture <br />State Participation <br /> <br />123 <br />123 <br />124 <br /> <br />Appended Materials <br />Definition of Terms . . . . . . . . , . . . . . . . . . . . . . . 125 <br /> <br />LIST OF TABLES <br /> <br />Table <br /> <br />2 <br /> <br />Estimated potential effects and costs-Selected <br />investigations units ......... <br />Historic and present modified quality of water-Colorado <br />River-Average values 1941-1970 ....... <br />Suggested guidelines for salinity in irrigation water . . <br />Projected concentrations of total dissolved solids (mg/I) <br />at Imperial Dam ........... <br />Total and direct damages attributable to salinity in <br />the Colorado River system . . . . . . . <br />Estimated salinity reductions-Colorado River at <br />Imperial Dam ........... <br />Summary of estimates of direct and indirect salinity <br />impacts on agricultural users by area ..... <br />Estimated salinity impacts-Annual costs (dollars) per <br />household per mg/I of TDS ........ <br /> <br />33 <br /> <br />7 <br /> <br />3 <br />4 <br /> <br />15 <br />15 <br /> <br />16 <br /> <br />5 <br /> <br />16 <br /> <br />6 <br /> <br />27 <br /> <br />7 <br /> <br />32 <br /> <br />8 <br /> <br />ii <br />