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I 'I I I I I I I I I 'I I I I I I I i I I A sufficient number of the undeveloped conditional water rights were operated in the computer simulation of the Colorado River basin to meet the demands for water at the assumed ultimate level of development of the basin (around year 2045). The additional demand placed on the Colorado River over and above the present level of diversions by the operation of these presently undeveloped rights amounted to the following: Transmountain Diversion to the East Slope New Irrigation Development Municipal Expansion in Colorado River Basin Industrial Oil Shale Thermal Power Coal and Other Mean Annual Diversions - AF 326,500 157,300 116,500 241,500 70,000 226,200 1,138,000 Table IV-6 indicates that under future conditions in the Colorado River basin there would be times when the West Divide Project water rights would be out of priority and could not legally divert. During these periods of shortage it is contemplated that the South Rifle Division supplies would be obtained from storage releases made from either Green Mountain Reservoir or Ruedi Reservoir. The replacement releases purchased under an appropriate contract would be sufficient in amount to make up the difference between the diversions from the river and the return flows to the river during such periods of short- age, In the absence of construction of any of the West Divide Project carryover storage features, we estimate that replacement releases would have to be made from storage in Green Mountain or Ruedi Reservoirs averaging about 83 AF per year when the first stage water system reaches full capacity at the estimated 1990 demand. IV-10