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<br /> <br />t&) <br />i-" <br />I:.D <br />01 <br /> <br />TABLE OF CONT~NTS <br /> <br />Page <br /> <br />..................................... <br /> <br />v <br /> <br />ILLUSTRATIONS <br /> <br />viii <br /> <br />ACKNOWLEDGEMENTS <br /> <br />.................................. <br /> <br />1 <br /> <br />INTRODUCTION <br /> <br />............................~........ <br /> <br />The Problem ............... <br /> <br />2 <br /> <br />.................. . <br /> <br />4 <br /> <br />SUMMARY AND CONCLUSIONS .......... -. . . . . . . . . . . . . . .. . <br /> <br />7 <br /> <br />GENE RA.L ...................-........ -. . . . . . . . . .. .. .. .. .. .. .. .. <br /> <br />9 <br /> <br />Irrigation Return Flow <br /> <br />......;..........,....... <br /> <br />origin of Return Flow........ ..,." ........... .-......... <br /> <br />12 <br /> <br />salt ~ccumulation in the Soil <br /> <br />21 <br /> <br />................ <br /> <br />PROBLEMS ASSOCIATED WITH EXCESSIVE SALINITy....... <br /> <br />23 <br /> <br />Effect on Domestic Use..... <br /> <br />24 <br /> <br />........~.......... <br /> <br />Effect on ~griculture ..... <br /> <br />26 <br /> <br />.....~............. <br /> <br />LOCATION OF MAJOR PROBLEM AREAS.................... <br /> <br />36 <br /> <br />Colorado River Basin <br /> <br />38 <br /> <br />......................... <br /> <br />upper Colorado River Basin Region <br /> <br />40 <br /> <br />............ <br /> <br />Lower colorado River Basin Region <br /> <br />45 <br /> <br />~........... <br /> <br />The Imperial Valley <br /> <br />49 <br /> <br />.......................... <br /> <br />The Coachella Valley <br /> <br />55 <br /> <br />..............'........... <br /> <br />The Rio Grande Basin <br /> <br />59 <br /> <br />.. ...... .......... .......... <br /> <br />Upper Rio Grande Basin <br /> <br />59 <br /> <br />....................... <br /> <br />Middle Rio Grande Basin <br /> <br />62 <br /> <br />. . . . . . . . . . . . . . . . . . . . . ., <br /> <br />ii <br /> <br /> <br />~ <br /> <br />. <br /> <br />. <br />