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PERMFILE61255
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PERMFILE61255
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Last modified
8/24/2016 11:07:54 PM
Creation date
11/20/2007 7:06:15 PM
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Template:
DRMS Permit Index
Permit No
M1981086
IBM Index Class Name
Permit File
Doc Date
7/23/1981
Doc Name
112 Permit Application
Media Type
D
Archive
No
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<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 />' 1.1.2 Dam, Reservoir and Power Plant <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 />' 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 />' 1-3 <br />
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