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<br />'<:I' <br />C\J <br />- <br />-- <br />c. <br />c <br /> <br />use of irrigation water by crops in an area of shortage was ad- <br /> <br />justed by applying a factor which deviated from unity by one- <br /> <br />half of the percentage deviation from the 1914-1945 normal of <br /> <br />the flow of the stream supplying the irrigated area. <br /> <br />Reservoir depletions, transbasin export diversions, and <br /> <br />depletions of ground-water basins were discussed in the section <br /> <br />of this supplement on basic data. <br /> <br />B. Channel Losses <br /> <br />The same methods and procedures for determining channel <br /> <br />losses discussed in the report for the 1914-1945 period were <br /> <br /> <br />followed in estimating channel losses for the 1946-1951 period. <br /> <br />Average annual evaporation based on both historic and virgin <br /> <br />flow conditions for the 1946-1951 period was determined for all <br /> <br />stream sections of the Colorado River from Lee Ferry to the <br /> <br />International Boundary and all tributaries in the Lower Colorado <br /> <br />River Basin downstream from any man-made developments. The <br /> <br />reductions in evaporation losses under historic conditions over <br /> <br />those under virgin conditions were listed as salvages deductible <br /> <br />from man-made depletions at sites of use. <br /> <br />The data on areas of native vegetation in the channels and <br /> <br />flood plains of streams, which were compiled for the 1914-1945 <br /> <br />period and discussed in the report, were adjusted to conform with <br /> <br />1946-1951 conditions. The rates listed in Appendix B of the re- <br /> <br />port were applied to the areas for each type and density of native <br /> <br />vegetation determined for the respective stream sections to derive <br /> <br />the stream depletions by native vegetation during the 1946-1951 <br /> <br />period. <br />