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<br />Q~r.n\rD <br />li"{. ~., - ' <br /> <br />Jt.N 1 ;; ',:J73 <br /> <br />i', <br />(~ . .. ... -uJAiID <br />cOh:.:;(.\(~t:.II'J" \) <br /> <br />ANNUAL REPORT <br />1972 Operation of the <br />Colorado River Basin <br />1973 Projected Operations <br /> <br />(prepared pursuant to the Colorado River Basin <br />Project Act of 1968, Public Law 90-537) <br /> <br />U. S. Department of the Interior <br />Roger< C. B. Morton, Secretary <br /> <br />Bureau of Reclamation <br />Ellis L. Armstrong, Commissioner <br /> <br /> <br />@ <br /> <br />January 1973 <br /> <br />Table of Contents <br /> <br />.. ~.... "'" .... <br /> <br />, <br /> <br />, ,'oJ' - ..~~-..... ~ .To _,. '.'" <br /> <br />~ "',, -.--.,,,,.-...- <br /> <br />,...... . <br /> <br />Page <br />Map - Upper Colorado and Lower Colorado River Basins Inside Cover <br />Authority for Report .................... . ii <br />Introduction ....................... . . . . . . . ii <br />Actual Operations under Criteria - Water Year 1972 .. . . . . . . . I <br />Upper Basin Reservoirs . . . . . . . . . . . . . . . . . . . . . . . . . . .2 <br />Lower Basin Reservoirs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 <br />River Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 <br />Beneficial Consumptive Uses ............................ 21 <br />Upper Basin Uses ..................... . . . . . . . 21 <br />Lower Basin Uses and Losses . . . . . . . . . . . . . . . . . . . . . . . . . . 21 <br />Water Quality Control . . . . . . . . . . . . . . . . . . . . . . . 22 <br />Water Quality Operations during Water Year 1972 .............22 <br />Future Water Quality Control . . 22 <br />Enhancement of Fish and Wildlife . . . . . . . . 23 <br />Upper Basin . . . . . . . . . . . . . . . . . . . . . . . 23 <br />Lower Basin ................ . . . . . . . . . 23 <br />PreseIVation of Environment .... . . . . . . . . . . . . . . . . . . . .. .. 25 <br />Projected Plan of Operation under Criteria for Current Year . . . . . . . . . . 26 <br />Determination of "602(a) Storage" . . . . . . . . . . . . . . . . . . . . . . 26 <br />Lower Basin Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 <br />Plan of Operation - Water Year 1973 . . . . . . . . . . . . . . . . . . . . .29 <br />Upper Basin Reservoirs . . 29 <br />Lower Basin Reservoirs . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 <br />