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<br />. <br /> <br />o <br />00 <br />o <br />(.0 <br /> <br />. <br /> <br />. <br /> <br />Summary <br />Part I <br /> <br />Part II <br /> <br />Part III <br /> <br />Pa rt IV <br /> <br />Part V <br /> <br />CONTENTS <br /> <br />Introduction <br />A. Authorization for report <br />B, Previous reports <br />C, Cooperation <br />Description of Basin <br />A. Geology <br />B. Soils <br />C. Climate <br />D. Vegetation <br />E. Hydrology <br />History of water resource development <br />A. Irrigation development <br />B. Streamflow depletions <br />C, Legal aspects, water quantity <br />1. Colorado River Compact <br />2. Mexican Treaty of 1944 <br />3, Upper Colorado River Basin Compact <br />4. Arizona vs. California suit in the <br />Supreme Court <br />5, Colorado River Basin Project Act <br />Legal aspects, water quality . . . <br />1, Water Quality Act of 1965 and related <br />developments <br />The Federal Water Pollution Control Act <br />Amendments of 1972 <br />Clean Water Act of 1977 <br />Relations with Mexico <br />Colorado River Basin Salinity Control <br />Act . <br />Economic conditions <br />salinity <br />Increased concentration from salt additions <br />1. Natural sources of salinity <br />Upper Basin <br />Lower Basin <br />Agricultural sources of salinity <br />Municipal and industrial sources of <br />salinity <br />Increased concentration from water depletions <br />1. Inbasin depletions <br />2. Transbasin depletions <br />of salinity on water use. <br />In-stream use <br />Irrigation use, <br /> <br />D. <br /> <br />2. <br /> <br />3. <br />4, <br />5. <br /> <br />E. <br />Causes of <br />A. <br /> <br />2, <br />3, <br /> <br />B. <br /> <br />Effects <br />A. <br />B. <br /> <br />i <br /> <br />Page <br />1 <br />4 <br />4 <br />5 <br />5 <br />7 <br />7 <br />8 <br />8 <br />9 <br />9 <br />12 <br />12 <br />12 <br />13 <br />13 <br />14 <br />14 <br /> <br />15 <br />15 <br />16 <br /> <br />16 <br /> <br />16 <br />23 <br />24 <br /> <br />28 <br />28 <br />30 <br />30 <br />30 <br />30 <br />32 <br />34 <br /> <br />35 <br />35 <br />36 <br />36 <br />37 <br />37 <br />37 <br />