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I I I I I I I I I I I I I I I I I I I ,,)t,,"!*' 0- ~...u'..,i SECTION III OPERATIONAL STUDY ASSUMPTIONS STREAM TRANSIT LOSS When reservoir, transbasin, or exchanged water is transported in a natural stream to a pOint of use, the State Engineer normally calculates a stream loss transportation charge. Due to the lack of stream loss data, the magnitude of the charge is often estimated. From Ruedi Reservoir to Parachute, it is estimated that a five percent charge is reasonable. If, however, the State Engineer were to determine a different stream transit loss estimate, this estimate would be used. RIVER WATER CALLS A thirty-year period of study from 1941 to 1970 was used to establish the pattern and dependability of the Dow Pumping Plant and Pipeline. It was concluded that the Dow Pumping Plant and Pipeline water right will not be directly affected by the Colorado River Basin Compact. To determine when the Dow Pumping Plant and Pipeline water right would be in priority, the Colorado River Simulation Program (CORSIM II) river basin operation simulation program and its associated data bank were used. This simulation model and data bank have been developed by the David E. Fleming Company. The modified Future Base Problem File utilized for the CORSIM II simulation of the Colorado River is referred to as the "Colony Model." This data base included future average depletions from the basin of about 820,000 acre feet per year above present levels of water use, including 225 cfs of continuous demand for oil shale developments. In addition, the Grand Junction - Colorado River Pipeline diversion capacity was increased from 91.5 to 120 cfs, and the Cities Service Pipeline diversion capacity was increased from 35 to 55 cfs. In the CORSIM II model, the level of development was estimated for year 2005 conditions under virgin flow and climatological conditions similar to the historic period of 1941 through 1970. (6)