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<br />. <br /> <br />. <br /> <br />. <br /> <br />February 1969 <br /> <br />Table J (continued) <br /> <br />Page 3 of' 3 <br /> <br />!I 1914-1967 from USGS Water Supply Papers. 1968 f'r~~ USGS Provisional Release, Colorado River <br />and 1ributaries in Lower Basin. Actual records be~an in June 1921. <br /> <br />y <br /> <br />1914-1958 from October 1963 Re~ion 3 report, Second Supplement to Report on ~ater Supply of <br />the Lower Colorado River Basin. 1959-1967 f'rom USGS Water Supply Papers. 1968 from USGS <br />Provisional Release. Actual records besan October 1934. <br /> <br />II Assumed to be 12} percent of annual chango in su~f'ace storage prior to first filling in 1941. <br />1942-1968 assllined to be &} perccnt of' annual change in surf'ace storage. <br /> <br />y <br /> <br />Estimates by USGS. 1935-1963 from March 1965, Journal of Irrigation and Drainage, ASeE, <br />pa(le 146. 1964-1967 from USGS 'vater 8-.lpply Papcrs. 1968 f'rom USGS Provisional Release. <br /> <br />1935-1967 from USGS '''ater Supply Papers. 1968 estimated. <br /> <br />2/ <br />y <br /> <br />Values represent usable storage, which was reduced by 3,207,000 acre-feet in ~IDy 1936 by <br />pcrmanent closing of temporary outlet (lates and adjustcd annually for sediment inflow. <br />Adjusted values for 1936-191f8 are based on results of the 1948-49 sedimcnt survey, and <br />1949-1953 values are ba.sed on results of the 1963-64 sedir.lent survey. Values f'or 1964-1968 <br />are also based on results of the 1963-64 sediment survey with no further adjustment for <br />sediment. <br />