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<br />003131 <br /> <br />Page 30 <br /> <br />Reservoir evaporation is applied at the end of each season. The <br /> <br />area/volume relationship for a reservoir is specified at several points. The <br /> <br />evaporation rate is specified in the surface area/volume table for each period. <br /> <br />Surface area is determined by linear interpolation; evaporation is the product <br /> <br />of the area and the seasonal rate. Area/volume relationships and evaporation <br /> <br />rates were adopted from the USBR Colorado River Simulation System (USBR, CRSS, <br />1982). <br /> <br />3. Representation of Upper Colorado River water use <br /> <br />DWOSYM explicitly estimates the maximum firm yield of Denver's water supply <br /> <br />system while operating the Colorado River mainstem in Colorado on a call basis. <br /> <br />Denver's existing system and various future system configurations can be <br /> <br />modeled. Alternate configurations can include both physical changes in Denver's <br /> <br />system and institutional changes concerning the operation of the river. In <br /> <br />addition, the demands of the Colorado-Big Thompson project and water sales from <br /> <br />Green Mountain reservoir can be specified. <br /> <br />The model utilizes a number of virgin flow data files for several West <br /> <br />Slope river reaches to represent the operation of the Colorado River above <br /> <br />Glenwood Springs. In order to model the effects of increased runoff, a number <br /> <br />of virgin flow files were modified to reflect the flow increases expected from a <br /> <br />representative vegetation manipulation program in the Arapaho National Forest. <br /> <br />Specifically, the virgin flows of the various tributaries of the Fraser" <br /> <br />Williams Fork, and the Colorado River above Kremmling and the Colorado River at <br /> <br />Dotsero were adjusted to reflect increased flows from vegetative manipulation in <br /> <br />the months of April, May, and June (Table III-I). OWDSYM was then used to <br />determine Denver's system yields under normal and enhanced virgin flows for <br /> <br />Denver's existing system and for future configurations of the system as <br />