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I I I I I I I I I I I I I I I I I I , I The storage and release patterns of the 12,550 acre-foot Stillwater Reservoir were not simulated in these operation studies. It was assumed that such an operation would have minimal effects and serve only to ensure that the 70-cfs direct flow right was consistently available throughout the year. YJWCD Rights As indicated in Chapter II, the total YJWCD rights is set by the level of study. This depletion level was assumed be utilized for agricultural, municipal, annual supply available under the annual depletion assumed for this to be 80,000 acre-feet and was to and industrial purposes. The YJWCD agricultural demand consists of 18,000 acre-feet per year and was assumed to be distributed over the irrigation season in accordance with the pattern established in the USBR Yellow Jacket Project Studies of 1976. The peak month of use was considered to be July, which required 29 percent of the annual total, followed by 27 percent in August, 24 percent in June, 12 percent in September, and 8 percent in May. The monthly demand pattern for the 5000 acre-feet of municipal and domestic supply was assumed to be proportional to the rate of use in Meeker. The water delivery records for 1977, 1978, and 1979 were used to compute an average monthly percentage. The industrial supplies delivered to the oil shale region were assumed to require some seasonal variation for revegetation of mine waste areas. It was assumed that the July-August rate would be approximately 10 percent greater than the monthly average, while the January-February rate would conversely be lower. A generally increasing rate in the spring and a decreasing rate in the fall was assumed. In addition to the oil shale demands, 12,000 acre-feet of industrial water was delivered annually for coal. The water demand for coal was assumed to be constant throughout the year. The monthly demands for each type of use considered in these operation studies were shown in Table III-I. V-5