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<br />,j.'l . J.... <br /> <br />. <br /> <br />~vaporacion from reservoirs is calculaced by applyin~ empirical <br /> <br />rates to measured water surface areas; the rates being determined primarily <br /> <br />by comparison with scandard Weather Bureau Class "A" evaporation pans. <br /> <br />Several other categories of use have also teen estimated. <br /> <br />Culinary and domestic depletions by urban areas are known to some <br /> <br />extent. Since the cotal population in urban centers in the Upper Basin <br /> <br />is relatively small and the bulk of the water diverted for domestic use <br /> <br />eventually finds its way back to the water courses as deep percolation from <br /> <br />septic tanks or sewage effluent from the City's sanitary and storm sewage <br /> <br />systems, the culinary and domestic consumptive use is relatively small. <br /> <br />. <br /> <br />Industrial use~ in the past have been relatively minor, but are <br /> <br />becoming more prevalent. This use can be estimated with relatively hieh <br /> <br />precision. The amount diverted, usually by pumpinp" can be accurately <br /> <br />measured as can the returns, if any, to the river system. <br /> <br />Other uses including water used for recre~tion, stockwater and <br /> <br />fish and wildlife are small but have been included in our estimates. <br /> <br />In summary, we feel that the total consumptive use in-basin and <br /> <br />total diversion from the basin are known to a reasonable degree of accuracy <br /> <br />and as shown in the attached table are now significantly less than che <br /> <br />7 1/2 I1AF of wacer allotted chis basin annually by the Compact. Therefore, <br /> <br />the matter of principal concern to the Lower Colorado River Basin for the <br /> <br />immediate future as far as Upper Basin depletions are concerned is the <br /> <br />. assurance that it will receive the water deliveries at Lee Ferry specified by <br /> <br />2 <br />