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<br />t'- <br />r- <br />M <br />N <br />c:: <br />o <br /> <br />TABLE OF CONTENTS <br /> <br />I~jil~' <br /> <br />LOCATION MAP . . . . . <br /> <br />Frontispiece <br /> <br />INTRODUCTION, SUMMARY, AND CONCLUSIONS <br /> <br />Purpose and Scope . . . . . <br />Authority for Investigation <br />Colorado River Salinity <br />Summary and Conclusions <br /> <br />1 <br />1 <br />1 <br />2 <br />3 <br />5 <br /> <br />SETTING . . , <br /> <br />Location <br />Cl imate . <br />Geology. . <br />Vegetation and Wildlife <br />Virgin River Flow, . , . . <br />Irrigation Diversion and Distribution Systems <br /> <br />Littlefield <br />Mesquite . . <br />Bunkerville <br />Riverside <br /> <br />5 <br />5 <br />6 <br />6 <br />7 <br />8 <br /> <br />9 <br />9 <br />9 <br />10 <br /> <br />. <br /> <br />LITTLEFIELD SPRINGS , <br />SALINE GROUND-WATER EXTRACTION <br /> <br />11 <br /> <br />14 <br /> <br />Ground-Water Barrier Concept. <br />Subsurface Exploration . <br />Ground-Water Quality . . <br /> <br />Water Balance . . <br />Salt Balance. ., . <br />Interpretation of Results <br /> <br />14 <br />15 <br />17 <br /> <br />19 <br /> <br />19 <br />21 <br />23 <br />25 <br />27 <br />27 <br /> <br />27 <br />28 <br />29 <br /> <br />SALT AND WATER BUDGET STUDIES <br /> <br />Surface Water . . <br />Ground Water . . . . . <br />Phreatophytes . . . . . <br />Agricultural Use . . . <br />Unsaturated Zone Soils <br />Water and Salt Balances <br /> <br />i <br />