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<br />'. <br />.~ <br /> <br />I.. <br />r . <br /> <br />t <br /> <br />., <br /> <br />TABtE OF CONTENTS <br /> <br />~ r ~- .. <br />r.: (. \J ,.. <br /> <br />Text <br /> <br />2 <br /> <br />Page <br /> <br />Let ter of Transrni ttal. .. .. I . . . . . . . . . . I . I . . . . . . . . . . < . . . . . . . ~ . . :3 <br />Report on problems of Imperial Valloy and vicinity: <br />Hydr~ulio problems of the Colorauo River................ 6 <br />Physiographic features...... " . .. . . . . . . . . .. . I . . . . .. .. .. .. .. '." 8 <br />Silt doposi t data....................................... 0................................ 13 <br />Urgency of relief......................................... 17 <br />Discharge of Colorado at Laguna Dam--Table Fo. 10.... 19 <br />Area: Irrigated 1915 and 1920 anc estimated ultimate <br /> <br />are3:............................. ... .............................................. ......" 21 <br />Boulder Canyon Reservoir--capacity table................ 31 <br />Progress of investigations.............................. 31 <br />High Line Canal........................................................................... 33 <br />Flood protection and irriG's.tion storage ocnofi ts........ 36 <br />POYJer devclopmcr:t........................................................................ 38 <br />Status of lands in Lo~er Colorado Basin in Uhited States 41 <br />Oonstruction methods..................................................................... 42 <br />Boulder canyon and other si tes.... .. .. .. .. .... .. .. .. .. .. ...... .. .. .. .. .. .. .. .. .. .. 50 <br />Rccornrnenda ti ons.. .. .. .. .. . .. .. .. .. .. .. .. .. . .. . .. .. .. .. .. .. . .. .. , . .. .. .. .. .. .. .. .. .. .. .. .. .. 56 <br /> <br />Illustrations. <br /> <br />Colora.do River Basin.......................................................................... <br /> <br />Boulder Canyon reservoir, capacity end area curves.....,.. <br />Black canyon reservoir, capacity and e~ea curves....,..... <br />Boulder Canyon damsite "C," photograph.................... <br />Map of 10\'Jer Colora.do TIiver basin.................................................. <br />Boulder Cmlyon Damsite, diagram Of firm horsepower...,.... <br /> <br />pago <br /> <br />Frontispiece <br />58 <br />59 <br />60 <br />61 <br />62 <br />