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.1 <br />' <br /> Big Thompson system for transport of water developed by the <br /> Subdistrict on the Western Slope to the participants on <br />the Eastern Slope. The Municipal Subdistrict has perfected <br /> water rights on the Colorado River for this project pursuant <br /> to Colorado law. <br /> 1 <br />1 <br />2 D <br />m <br />R <br />s <br />i <br />d P <br />w <br />Pl <br />t <br /> . <br />. <br />, <br />a <br />e <br />ervo <br />r an <br />o <br />er <br />an <br /> The proposed diversion dam will consist of a zoned earth fill <br /> embankment composed of compacted clay, silty sand, gravel, <br /> and cobbles with a slurry trench cutoff. The dam will have <br /> a maximum height of 27 feet with a crest elevation of 7,838 <br />' feet and a crest length of 3,375 feet. A low-level bypass <br /> structure will be provided at the maximum section of the <br /> diversion dam to release up to 135 cfs to satisfy downstream <br />' fish and irrigation flow requirements. <br /> The reservoir formed by the diversion dam will have a total <br /> live storage capacity of 320 acre-feet between Elevation 7828 <br /> (normal minimum operating level) and Elevation 7827 (normal <br /> maximum operating level and service spillway crest elevation.) <br /> Dead storage (water stored below Elevation 7823) will be 125 <br />' acre-feet. The live storage capacity will allow considerable <br /> flexibility in pumping plant operation during periods of low <br /> flow, and especially when low flows have excessive daily and <br /> hourly fluctuations. The maximum reservoir water surface during <br />' flood flows was set at Elevation 7836. Backwater from this <br /> flood would not affect the normal flood levels at the confluence <br />' of the Colorado and Fraser Rivers. The surface area of the <br />reservoir at normal maximum pool will be about 112 acres. <br /> During the Probable Maximum Flood (PMF) the reservoir surface <br /> area would be 155 acres. <br />' <br /> The pumping plant will be located on the right abutment of the <br /> diversion dam on.the south side of U.S. Highway 40, near its <br /> junction with State Highway 125. The reservoir will form the <br />' forebay to the plant and the intake to each pump will be <br /> provided with trashrack facilities and slide gate. <br />' 1.1.3 Windy Gap to Lake Granby Pipeline <br /> From the pumping plant, the pipeline will proceed in a long <br /> curve under U.S. Highway 40 and then under State Highway 125. <br />' The alignment then climbs to the northwest where the surge tank <br /> will be located. From this point the alignment is nearly <br /> straight to Lake Granby with only minor directional changes <br /> to avoid problem areas. <br /> The pipeline will have several local high and low points along <br /> this alignment. Automatic vents will be installed at each high <br /> point, and provisions for draining in the pipeline will be <br /> provided at each low point. At the crossing under Willow <br /> Creek, the pipeline will not be gravity drained because it <br />' will be below the ground water table; facilities for pumping <br /> out the pipe will be provided at this point. <br /> <br /> 1-3 <br />