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<br />00 <br />- <br />-' <br />- <br />c. <br />C <br /> <br />4. Channel Areas <br /> <br />Tne basic data for channel areas, which were compiled for <br /> <br />the 1914-1945 period and discussed in the report, were used as a <br />basis for determining channel losses for the 1946-1951 period. <br />The data were adjusted to conform with 1946-1951 conditions. <br /> <br />5. Reservoir Depletions <br />The methods used in determining reservoir depletions were <br /> <br />discussed in detail in the report. <br /> <br />(q.) Evaporation depletions - Average stream depletions re- <br /> <br />sulting from changes in evaporation and transpiration within <br /> <br />reservoir areas in the Lower Colorado River Basin during the <br /> <br />1946-1951 period are listed in Table MS 8. <br /> <br />(b) Change in storage in reservoirs - Records of storage <br /> <br />''lere available for all the larger storage reservoirs in the Lower <br /> <br />Colorado River Basin and changes in surface storage for the 1946- <br /> <br />1951 period ~'ere readily determined. As discussed in the report, <br /> <br />changes in storage in the smaller reservoirs had no appreciable <br /> <br />effect on average stream flows and were not determined. <br /> <br />Bank storage in Lake Mead was determined as the differential <br /> <br />in the hydrologic equution resulting from inflow-outflow studies <br /> <br />on an annual basis for the stream section between Grand Canyc.n and <br /> <br />Hoover Dam. The annual contributions of runoff from the ungoged <br /> <br />drainage area upstream from Hoover Dam were derived by applying <br /> <br />the ratios of virgin flows of tributaries near the ungaged area <br /> <br />for each of the years 1946 through 1951 and the average for the <br /> <br />9 <br />