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<br />.-j <br />.-j <br />.- <br />-' <br />C' <br />C <br /> <br />II. BASIC DATA <br /> <br />The general description of the Lower Colorado River Basin as <br /> <br />given in the report suffices for this memorandum. <br /> <br />Two base maps of the Lower Basin were included in the report <br /> <br />and appendixes~ No additional maps were prepared for this supple- <br /> <br />. <br /> <br />ment. Although there has been an increase in the irrigated land <br /> <br />in the Lower Basin, most of the expansion has been contiguous to <br /> <br />the areas depicted on the map in Appendix B of the report. <br /> <br />A. Climatological Data <br /> <br />Normal consumptive use of water rates as listed in Appendix <br /> <br />B of the report were applied in estimating the consumptive use of <br /> <br />irrigation water by crops and areas incidental to irrigation, <br /> <br />domestic and municipal uses,_and uses by native vegetation for <br /> <br />the 1946-1951 period. These rates were predicated on climatolo- <br /> <br />gical data for the 1914-1945 period as representative of average <br /> <br />conditions. Where necessary, the normal consumptive uses are ad- <br /> <br />justed to reflect the water supply available during the 1946-1951 <br /> <br />period. <br /> <br />Evaporation records for the 1946-1951 period were compiled <br /> <br />from published data of the Weather Bureau and the Bureau of Reclama- <br /> <br />tion and used in estimating the evaporation from the large reser- <br /> <br />voirs during the period. Evaporation losses from small reservoirs <br /> <br />and other h~ter surfaces were estimated for the 1946-1951 period <br /> <br />by application of the data presented in the report as average for <br /> <br />the 1914-1945 period. <br /> <br />Records of precipitation for the 1946-1951 period were compiled <br /> <br />for only those statio~s necessary in determining depletions by large <br /> <br />reservoirs.. <br /> <br />2 <br />