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3.10 purposes as releases from Ruedi Reservoir. Pursuant to Senate Document 80, releases are made from Green Mountain to make up natural flow shortages in the Colorado River. The shortage is determined at the Dotsero gaging station under the assumption that if shortages are met at that location then water rights downstream will be met with the addition of flows from the Roaring Fork River. Large conditional rights on the Colorado River are located between Glenwood Springs and the Grand Valley. These rights are for municipal, domestic, and industrial purposes, primarily related to future industrial development. The largest 12 conditional rights are held by the oil shale industry and total about 831,100 AF per year (1,150 cfs). Numerous studies have been made to determine the future water demand of the Colorado River as it relates to oil shale development. The estimated degree of development of conditional rights which would take place in response to domestic and industrial growth varies from less than five percent for a very limited growth scenario to 65 percent with very large-scale growth (Rice et al., 1982, and Colorado Department of Natural Resources, 1981). 44ith approximately one-half of the conditional rights being developed in the future, an increased demand of 433,600 AF per year (600 cfs) would result. This level of demand was assumed to be a conservative estimate of future demand for the Ruedi Reservoir operational studies. Based on past requests for water from Ruedi Reservoir, 19,500 AF of the demand will be for municipal and domestic purposes. The remaining requests, representing future water demand by industry, are 56,800 AF per year. Demand patterns given by municipalities requesting water show that the demand for water will vary over the year for municipal and domestic use. These patterns were used to develop a weighted municipal and domestic water demand pattern. Industrial demand was assumed to be constant during the year. Table 3.5 shows the demand patterns which were used in scheduling water releases from Ruedi Reservoir. 3.3 Aquatic Biology 3.3.1 Physical/Chemical Characteristics and Habitat Features A brief discussion of the physical and chemical characteristics of Ruedi Reservoir is provided below. The reservoir, which is aligned in an east-west direction, is about five miles in length, 0.2 to 0.8 miles in width, and has a full surface area of 997 acres. The volume of the reservoir is usually at or Just below maximum capacity of 102,400 AF in the summer, while minimum volumes ranging between 50,000 and 80,000 AF usually occur in the winter. The maximum