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<br />u: <br />c:.:. <br />C <br />t"': <br /> <br />CONTENTS <br /> <br />c: <br /> <br />Frontispiece <br /> <br />INTRODUCTION.......................................................... .1 <br /> <br />Purpose and Authority_.............................................. <br />Scope of Study................................................... <br />Study <br />Prior <br /> <br />Participants and Coordination.. <br />Studies and Reports............ <br /> <br />............................ <br /> <br />.1 <br />.1 <br />.4 <br /> <br />............................... .4' <br /> <br />The Report.............................. <br /> <br />.......................... .5 <br /> <br />'-$~~) <br />"cX/ <br /> <br />RESOURCES AND ECONOMY OF THE STUDY AREA................................7 <br />Environmental Setting and Natural Resources..........................7 <br />Economic Development in the Flood Plain..............................8 <br />Economic Operations Outside the Flood Plain..........................9 <br /> <br />PROBLEMS t NEEDS t AND OPPORTUNITIES.................................... .11 <br />Existing Plans and Improvements.................................... .11 <br />Flood History...................................................... .13 <br />Flood Problem...................................................... .14 <br />Water Supply--Present and Projected Needs...........................20 <br />Hydropower......................................................... .20 <br />Water Quality...................................................... .21 <br />Recreation. .. ., . . . ... . .. . . .. . . . . . .. . . . . . . ... . . .. .. . .. .. . .. . . .. . . ... .25 <br /> <br />Colorado River Floodflows in Mexico.................................25 <br /> <br />FORMULATION OF ALTERNATIVE PLANS...... ,1.............................. .27 <br />Planning Objectives................................................ .27 <br />Planning Period................................... 11 .. . .. . . . .. . . . . . . .28 <br />Hoover Dam Flood Control Operation..................~...............28 <br />Formulation Criteria and Alternative Plans..........................30 <br />Evaluation Criteria.................................................34 <br /> <br />ASSESSMENT AND EVALUATION OF ALTERNATIVES.............................3? <br /> <br />/'~' <br />~.~~] <br />\Jj(.j? <br /> <br />Predicted Impacts.................................................. .37 <br />Alternative 2.................................................... .37 <br />Al ternative 3.................................................... .38 <br />Alternative 4.................................................... .38 <br />Alternative 5.................................................... .38 <br />Alternative 6.......................,1............................ .43 <br />Alternative 7................................................ ,1... .43 <br />Alternative 8.................................................... .43 <br />Alternative 9................................................... ..44 <br />Social Impacts............................................ ,1........ .44 <br />Division of Responsibilities........................................46 <br />Views of Federal Agencies.......,.................................. .46 <br />Views of Non-Federal Agencies and of Others.........................46 <br /> <br />iii <br />