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. to the reservoir are reduced by the projected upstream depletions; and 7) the adjusted inflows are balanced against projected downstream demands. A surplus represents storable flow that can be retained to fill any available storage in the reservoir, and a deficit represents downstream demand. The specific areas where WWE's methodology varied from the above are identified in the subsequent discussion. B. CURRENT WATER AVAILABILITY Flows currently available to the Webster Hi 11 Reservoir site were estimated by adjusting the gaged flows at the USGS gage near Cameo for the water years 1943-1982. The data from this gaging station were used instead of data from the ones near DeBeque or the former New Castle gages because of the longer period of record available at Cameo. . A factor for adjusting the gaged flows near Cameo was developed to compensate for the difference in drainage areas and precipitation above the Cameo gage and the Webster Hi 11 Reservoir. The adjusted average annual flow at the Webster Hill site is 2,524,000 ac-ft. C. CURRENT WATER USAGE 1. Transmountain Diversions Great quantities of water are diverted out of the Colorado River Basin to the eastern side of the continental divide annually. These annual diversions have increased from about 100,000 ac-ft in the early 1940s to an average of 532,000 ac-ft from 1978 to 1982. For the purposes of this study, the transmountain diversion data were distributed according to the monthly averages over the 10-year period of 1973 to 1982. 2. Upstream Consumptive Uses The most significant upstream consumption comes agricultural, domestic, municipal, and industrial uses and reservoir evaporation, with agricultural use accounting for from from most . 3686-a/6 II-2