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Consumptive/Uses and Losses 13 tributaries ofthe Colorado River Basin water-short area. As a result of almost 0 was estimate(l from records obtained continuous studies concerning these . ,~ (~.) from the various power companies in the problems, adequate production and ~ '6- , eflluent records are usually available to N Basin. These! recorda were complete and <:::> were judged fu be accurate. adequately assess water use. N Municipal and Industrial Transbasln plverslons The basis for !estimating municipal and Nearly all the transbasin diversions industrial us~s was the urban and rural both out of and into the Colorado River population within the reporting areas. System were measured and reported by Preparation o,f annual population the Geological Survey, or local water estimates was guided by the 1970 and commissioners and users. The 1980 censuseS, various State and county remainder were estimated on the basis statistical rev:iews, and reports that of past records and capacity of facilities. included pop1.!lation estimates for local Due to the high degree of measurement, areas. The yearly population estimates this area of basin consumptive use is for the Upper' and Lower Basins are considered to be quite accurately shown in tabl~s UC-8 and LC-lO, determined. respectively. ;Water withdrawal rates ,f' for urban and rural uses in the various cil'~ reporting are$.Swere derived from Lower Colorado available stuqies in the metropolitan River Main Stem areas, State Water Plan reports, and Bureau of ReClamation technical The annual consumptive use of water guidelines, These withdrawals were then, from the Colorado River main stem by converted to depletions using average the States and exports from the system basin consumlltive use factors, were taken from the Bureau annual The population of the Colorado River report entitled "Compilation of Records in Accordance with Article V of the System, estim.ated at nearly 4.5 million Decree of the United States in Arizona in 1985, has increased at an annual rate vs. California." The estimated Colorado slightly in excess of 3 percent during River component of the combined this reporting period. A large portion of surface and subsurface return flows the populatioJ;l resides within Maricopa accruing to Las Vegas Wash and and Pima CoUnties, Arizona, and in discharging into Lake Mead, as taken Clark County, Nevada. Sixty percent of from the report, is credited to Nevada's the Upper BaSin and about 20 percent of municipal and industrial water uses. the Lower Ballin population were Unmeasured subsurface return flows classified as ~ with a significantly were estimated below Hoover Dam, smaller per capita use of water. Both based partially on preliminary the urban an4. rural areas have the information supplied by the Task Force mutual probl~m of providing an on Ground-Water Return Flows. All adequate curlent and future water unmeasured subsurface return flows supply for a growing population in a