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lO'1't The Operation Plan fo~ Water Year 1975 Western Slope Collection System There are five diversion points complete on the western slope: Sawyer Creek, Chapman Gulch, South Fork of the Fryingpan River, Fryingpan River at Marten Creek, and Lily Pad. Transmountain diversions at these points will be regulated to the end that no diversions will be made that will reduce remaining aggregate streamflows to less than those minimum standards contained in the Fryingpan-Arkansas Project Operating Prin- ciples. For planning purposes, data from our collection system yield, and sizing studies were used to determine the diversions in 1975. The 10-, 50-, and 90-percent chance va14es were obtained from the probability curve shown on exhibit 2 and are considered to represent the reasonable minimum, most probable, and reasonable maximum diversions, respectively. It is intended that, throughout the year, all water that is physically available above the minimum bypass requirements will be diverted. Reservoirs (General) . Three detailed monthly operation studies have been made which simulate. the proposed operation of Ruedi Reservoir, Turquoise Lake, and Pueblo Reservoir. Two of the Studies simtllate operations with extremely high or extremely low water supply conditions. Reservoir inflow in 1975 has a l-in-10 chance of being less than the reasonable minimum, and a l-in-10 ~ chance of being greater than reasonable maximum. Therefore, actual opera- tions in 1975 have an 8-in-10 chance of falling between the limits of the extreme studies. The third study simulates operations with most probable water supply conditions. In preparing the operation studies, it was intended to provide the necessary flexibility to change from one set of conditions to another. The ever- changing situation regarding inflows, downstream requirements, etc., will require many adjustments. Operation schedules will be adjusted as re- quired. Forecasts of the April through July reservoir inflow will be started on March 1, 1975, and continue on the first of each succeeding month through May 1. Ruedi Reservoir Reservoir Inflow Inflow to Ruedi Reservoir is considered to be the flow of the Fryingpan River at Ruedi, Colorado. Records are available at this station for October 1959 through September 1964. For water years 1965 through May 1968, discharge at the gaging st9tion on the Fryingpan River near Ruedi, Colorado, is corrected for Rocky Fork flow and used as Fryingpan River flow at Ruedi, Colorado. Rocky Fork flow was estimated from spot measurements. After May 1968, when storage began in Ruedi Reservoir, 10 .