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I I I I I I I I I I I '. I I . I I . I (Colorado River at G1enwood Springs) and 9-0850 (Roaring Fork River at G1enwood Springs) for the years 1941 through 1966 and the recorded flows at USGS gaging station 9-0851 (Colorado River below G1enwood Springs) for the years 1967 through 1977. This period contains the low flow years of 1954 and 1977 as well as the high flow years of 1957 and 1962. From the above it should be apparent that the physical availability of streamflows at the water system intake will not be a controlling factor. For the same reasons the maintaining of minimum levels of instream flows to protect the natural environment will also not be a limiting factor. However, the West Divide Project water rights discussed in a subsequent section of this chapter are junior in priority to major existing diversions downstream of Cameo and to a number of major conditional water rights located both upstream and downstream of Rifle. The senior rights could pre-empt the legal ability of the proposed South Rifle Division to divert from the river under the trans- ferred West Divide Project water right, Therefore, the West Divide District will obtain supplemental supplies from existing federal storage reservoirs upstream. In previous investigations of the West Divide Project made by The David E. Fleming Company for the West Divide Water Conservancy District and the Colorado River Water Conservation District, operation of the Colorado River basin, exclusive of the Gunnison River, under future conditions of development was simulated using the proprietary CORSIM II computer program. Table IV-6 lists the amounts of water which would be available to a 185 cfs West Divide Project direct diversion right from the Crystal River at Placita. These values were obtained from the CORSIM simulation for a realistic ultimate level of development of the basin. IV-8