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The surface area of each reservoir is shown in Table 4. Fullness factors are provided depending on the <br />elevation of the reservoir location (i.e. fullness factor = 0.87 if elevation > 8,600 feet; fullness factor = <br />0.75 otherwise). <br />As with the stock ponds, the evaporation and rainfall data for reservoirs are obtained from monthly <br />weather files. A separate set of weather station weights is provided for each reservoir. Evaporation is <br />estimated using the same equation used for stock ponds. <br />Municipal <br />The 1980 and 1990 Population Census data are used to estimate the annual values for years 1985-89. A <br />straight-line interpolation is used. The reported values are by county, and therefore some form of <br />interpolation has to be adopted to get the equivalent values for each subarea. The USBR Colorado River <br />System Consumptive Uses and Losses Report, 1981-1985 contains population data already broken down <br />into each subarea. The distribution of the county population over the subareas is then preserved through <br />the years. Table 5 shows the population per subarea. <br />The per capita gross usage for each type of use (urban, rural, commercial, and public) can be provided <br />(and thus, allowed to vary) for each subarea. However, the subarea-specific data are not available. They <br />could be computed from the diversions of the water companies and their population size being served. <br />Currently, an average value for the whole state of Colorado is used. The per capita gross usage and the <br />consumption ratio for each type of use are shown in Table 6. <br />The product of the per capita gross usage and the consumption ratio is equal to the per capita net usage. <br />There is no data at this time that delineates rural areas from urban areas in terms of water usage, so they <br />are given the same per capita usage values. <br />Mineral Resources <br />There are no data available for computing consumptive use from mineral resources for the Gunnison <br />River basin. <br />Thermal Electric <br />There is no thermal electric power plant in the Gunnison River basin. The USBR Colorado River System <br />Consumptive Uses and Losses Report, 1981-1985 shows that for the State of Colorado power plants are <br />only located in HU14010005, HU14050001, and HU14030003, which are outside the Gunnison River <br />basin. <br />Export(Transmountain Diversions) <br />Transmountain diversion data are obtained mainly from the Annual Report of the Division of Water <br />Resources, Water Division IV, for the water years 1985-1990. Table 7 shows the different diversion <br />structures where diversion is recorded for the years 1985-1990. The diversion records are available in <br />total volumetric amount for the year. Since the datafile format requires monthly data, the total value for <br />the year has been assigned to December (end of the year) with the rest of the months assigned zero. <br />3 <br />A275 01.09.9 5 1.14-23 Manguerra <br />