WSP07339 - Laserfiche WebLink

Home Browse Search

. . . 1~0~, L~ The Operation Plan for Water Year 1976 Western Slope Collection System There are five diversion points completed on the western slope: Sawyer Creek, Chapman Gulch, South Fork of the Fryingpan River, Fryingpan River at Marten Creek, and Lily Pad. The Ivanhoe Diversion Dam is completed, and a temporary pipeline will be constructed to divert water from Ivanhoe Creek in the spring of 1976. 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 Principles. For planning purposes, data from the collection system yield and sizing studies were used to determine the diversions in 1976. The 10-, 50-, and 90-percent chance values were obtained from the probability curve shown on Exhibit 2 and are considered to represent the reasonable mini- mum, 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 operations studies have been made which simulate the proposed operation of Ruedi Reservoir, Turquoise Lake, and Pueblo Reservoir. Two of the studies simulate operations with extremely high or extremely low water supply conditions. Reservoir inflow in 1976 has a l-in-lO chance of being less than the reasonable minimum, and a l-in-10 chance of being greater than the reasonable maximum. Therefore, actual operations in 1976 have an 8-in-lO chance of falling between the limits of the extreme studies. The third study simulates operations with most probable water supply conditions. In preparing the operations 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 ad- justed as required. Forecasts of the April through July reservoir inflow will be started on March 1, 1976, 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 11