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<br />. <br /> <br />. <br /> <br />. <br /> <br />Ta.b1e 1 (continued) <br /> <br />July 15,'1969 <br />Page 3 of 3 <br /> <br />!I 1914-1967 from USGS Water Supply Papers. 1968 fra~ USGS Provisional Release, Colorado River <br />and 1ributaries in Lower Basin. Actual records began in June 1921. <br /> <br />y <br /> <br />1914-1958 from October 1963 Region 3 report, Second Supplement to Report on Water Supply o~ <br />the Lower Colorado River ~sin. 1959-1967 from USGS Water Supply Papers. 1968 fr~~ USGS <br />Provisional Release. Actual records besan October 1934. <br /> <br />Assumcd to be 12} percent of annual change in surface storage prior to first filling in 1941. <br />1942-1968 assumed to be 6-~' perccnt o~ lUUlual changc in sur.face storage. <br /> <br />. <br /> <br />'lI <br /> <br />~ Estimatcs by USGS. 1935-1963 ~rom March 1965, Journal of Irrigation and Drainage, ASCE, <br />pa.ce 146. 1964-1967 from USGS \vater Supply Papers. 1968 from USGS Provisional Release. <br /> <br />11 1935-1967 from USGS Water Supply Papers. 1968 estimated. <br /> <br />21 Values represcnt usable stor~e, which was rcdueed by 3,207,000 acre-feet in ~hy 1936 by <br />pc~anent closing of temporary outlet catcs and adjustcd annually for sediment inflow. <br />Adjusted values for 1936-191~ are based on results of the 1948-49 sediment survey, and <br />19~9-1963 values are based on results of the 1963-64 sediment survey. Values for 1964-1968 <br />are also based on results o~ the 1963-64 sediment survey with no further adjus"bnent for <br />sediment. <br /> <br />'. <br />