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<br />".'\ basin. The estimates for 1996-99 were computed using a straight-line interpolation <br />between the USGS 1995 and Census 2000 values. The USGS 1995 population was <br />divided by the USGS 1995 consumptive use to get a per capita use rate. This use rate <br />was applied to the above computed population estimates for 1996-2000 to compute <br />consumptive use. <br /> <br />c. <br /> <br />') <br />.. <br />(X;l <br /> <br />A similar methodology was used to estimate the minerals consumptive use. The trend in <br />the use minerals use from 1990 to 1995 was used to project the mineral use for 1996- <br />2000. In some cases, a trend could not be established and the USGS 1995 value was <br />used to estimate 1996-2000. A summary table for all M&I use is found in exhibit 14. <br /> <br />Reservoir Evaporation <br />Reservoir evaporation includes water loss from all man made water bodies except stock <br />ponds and mainstem reservoirs. The reservoirs were separated into two groups: <br />measured and unmeasured. The measured reservoirs are those for which detailed <br />monthly reservoir elevation data is available. These consisted of Bureau of Reclamation <br />project reservoirs and Denver Water Board reservoirs. The unmeasured reservoirs are <br />those without detailed monthly data. The data collected for these reservoirs consisted of <br />maximum surface area, location, and primary use. For both measured and unmeasured <br />reservoirs, the net evaporation is calculated as FWS evaporation minus the greater of the <br />precipitation or salvage value. The FWS evaporation value was taken from NOAA <br />Technical Report NWS 33, Evaporation Atlas for the Contiguous 48 United States, June <br />1982, Map 3 of 4: Annual FWS Evaporation using the reservoir location information. The <br />salvage values and fullness factors were taken from the 1991-95 report. Precipitation was <br />taken from historic data at local weather stations and a hydrologic unit weighted average <br />precipitation was computed. Reservoir evaporation was estimated on a monthly basis for <br />the measured reservoirs and on an annual basis for the unmeasured reservoirs. A <br />summary of the reservoir evaporation is presented in exhibit 15. <br /> <br />7 <br />