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Windy Gap Firming Project Draft Environmental Impact Statement August 2008
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Windy Gap Firming Project Draft Environmental Impact Statement August 2008
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Water Supply Protection
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Windy Gap Firming Project Draft Environmental Impact Statement August 2008 Reclamation Managing Water in the West
State
CO
Date
8/1/2008
Title
Windy Gap Firming Project Draft Environmental Impact Statement August 2008
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EXECUTIVE SUMMARY <br />WINDY GAP FIRMING PROJECT DRAFT ENVIRONMENTAL IMPACT STATEMENT <br />and less than a 2 percent increase (1,000 AF) for the other alternatives as a result of the additional <br />Windy Gap water imports and lower diversions for power generation in the C -BT system. <br />• Streamflow below Participant wastewater treatment plants (WWTPs) would increase from the <br />discharge of Windy Gap return flows to the Big Thompson River, St. Vrain Creek, Big Dry Creek, <br />and Coal Creek. <br />• Water levels in Grand Lake or Shadow Mountain Reservoir would not change under any of the <br />alternatives. <br />• Granby Reservoir average monthly water levels would decrease from 2 to 3 feet under the No Action <br />alternative, 5 to 8 feet under the Proposed Action, and 3 to 4 feet under the other alternatives (Figure <br />ES -6). A series of dry years could lower water levels up to 23 feet under the Proposed Action. <br />• Water levels in Carter Lake would decrease less than 1 foot under all of the alternatives. <br />• Average monthly water levels in Horsetooth Reservoir would not change under the No Action <br />alternative, would decrease 2 to 6 feet under the Proposed Action, and would decrease 0 to 2 feet <br />under the other alternatives. <br />• Windy Gap firm yield would increase from zero under existing conditions to about 26,000 AF under <br />the Proposed Action and alternatives (Table ES -3). Firm yield under the No Action alternative would <br />be about 1,200 AF and would not meet the project purpose and need. <br />Figure ES -6. Granby Reservoir estimated average monthly surface elevation by alternative. <br />ES -10 <br />
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