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I, I I I I' I I I I' I I I I I, I I I I I 6.0 RESERVOIR OPERATION ANALYSIS The Taylor Park Reservoir operations' effect on the downstream locations were analyzed as part of this study. A spreadsheet model was created to simulate the operation of the Taylor Park Reservoir and the resulting impacts downstream. The model begins at the Taylor Park Reservoir and continues to the Taylor River below Taylor Park Reservoir, Taylor River at Almont, Gunnison River at Almont, and the Gunnison River near Gunnison. 6.1 TAYLOR PARK RESERVOIR Taylor Park Reservoir is one component of the Uncompahgre Project located on the western slope of the Rocky Mountains in west-central Colorado. The Uncompahgre Project lands surround the town of Montrose and extend 34 miles along both sides of the Uncompahgre River to Delta, Colorado. Project features include Taylor Park Dam and Reservoir, Gunnison Tunnel, 7 diversion dams, 128 miles of main canals, 438 miles of laterals, and 216 miles of drains. The systems divert water from the Uncompahgre and Gunnison Rivers to serve over 76,000 acres of project land. Although there is no specific reservoir capacity assigned for flood control, the Uncompaghre Project has provided an accumulated $639,000 in flood control benefits from 1950 to 1999 (USBR, 2004). The Taylor Park Dam is situated on the Taylor River, a tributary of the Gunnison River. The dam is a zoned earth fill structure 206 feet high, with a crest length of 675 feet and a volume of 1,115,000 cubic yards. The reservoir has a storage capacity of 106,200 acre-feet at its spillway crest. The spillway is an overflow-type weir crest 180 feet long with a capacity of 10,000 cubic feet per second. The lower level outlet works is a horseshoe tunnel with a diameter of 10 feet, and an approximate capacity of 1,800 cubic feet per second at the spillway crest. The Taylor Park Dam was authorized by the Secretary of the Interior as part of the Uncompaghre Project on March 14, 1903, under the provisions of the Reclamation Act. Construction of Taylor Park Dam was approved by the President on November 6, 1935. Taylor Park Dam was built using funds allotted under the National Industrial Recovery Act and was completed in 1937. General information on Taylor Park Reservoir is presented below. · Construction Date: 1935-1937 · Crest Elevation of Dam: 9,344.0 feet · Structural Height of Dam: 206.0 feet · Crest Length: 675.0 feet · Spillway Crest: 9,330.0 feet · Spillway Crest Length: 180 feet · Spillway Capacity at Elev. 9,336.0 ft: 10,000 cfs · Top of Active Conservation Pool: 9,330.0 feet · Top of Dead Storage: 9,183.0 feet · Streambed at Dam Axis: 9,176.0 feet · Drainage Area: 254.0 square miles 6.2 BALANCED HYDROGRAPHS The spreadsheet model uses a pattern snowmelt runoff hydrograph in order to create the balanced 1 percent chance exceedence hydrographs for input into the model. The pattern was developed for a 60-day duration snowmelt runoff event. One pattern was used to develop the input hydrographs for all locations. 48