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SWSI II Technical Roundtables
Title
SWSI Phase 2 Report - Section 5 Addressing the Water Supply Gap Technical Roundtable
Date
11/7/2007
Author
CWCB
SWSI II - Doc Type
Final Report
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Section 5 <br />Addressing the Water Supply Gap Technical Roundtable <br />In March, 2006 a number of East Slope and West <br />Slope entities entered a Study Participation <br />Agreement to further study alternatives for a Blue <br />River Pumpback, including the so-called Everist <br />Pumpback and Green Mountain Pumpback, and <br />replacement water and new supply from a Wolcott <br />Reservoir. The scope ofworkwas to estimate yields <br />from various alternatives and configurations, update <br />costs from previous studies for comparative <br />purposes, and examine impacts of the alternatives. <br />The study was not intended to examine in detail the <br />impacts of a pumpback, but was simply intended as <br />a reconnaissance-level effort to help the study <br />participants determine whether additional <br />The Study consisted of three primary aspects: l) <br />evaluation of hydrologic effects and potential <br />additional supply; 2) preparation of preliminary <br />opinions of probable construction and operating <br />costs; and 3) assessments of likely effects on water <br />quality. <br />Hydrologic effects and supply assessments were <br />performed using Denver Water's PACSM model <br />and, for the Everist Pond pumpback option, an <br />additional spreadsheet analysis. Simulations were <br />conducted over the historic period of record of 1947- <br />1991(45 years). Shown below are the four modeling <br />scenarios used in the Study: <br /> ~- . . <br />Existing System and Existing water demand conditions imposed on <br />Existing Demands historical hydrology; model reflects current <br />(Simulation 1) water resources infrastructure and <br /> administration in the Colorado and South <br /> Platte River basins <br />Existing System, Full Future demand conditions imposed on <br />Use Demand historical hydrology; model reflects current <br />(Simulation 2) water resources infrastructure and <br /> administration through the Colorado and <br /> South Platte River basins <br />Everist Pond Green Mountain decree reduced by 10,000 <br />Pumpback AF; Wolcott Reservoir firms 20,000 AF of new <br />(Simulation 3) West Slope use; Everist Pumpback analyzed <br /> by post-processing results <br />Green Mountain Pumpback from 62,000 AF pool in Green <br />Reservoir Pumpback Mountain Reservoir; Wolcott Reservoir <br />(Simulation 4) assumes CBT exchange function and firms <br /> 20,000 AF of new West Slope use <br />The Green Mountain Pumpback would involve the <br />pumpback of water supplies from Green Mountain <br />Reservoir to Dillon Reservoir. This would increase <br />the yield of Dillon Reservoir. Supplies pumped back <br />from the Green Mountain Reservoir would be <br />conveyed via Denver Water's Roberts Tunnel to the <br />North Fork of the South Platte River where supplies <br />would be gravity fed to the South Platte. Wolcott <br />Reservoir would be constructed to, in part, replace <br />Green Mountain Reservoir's current operational <br />purposes of replacing out of priority diversions from <br />the Colorado-Big Thompson (CBT.) The Green <br />Mountain Reservoir Pumpback option can <br />potentially produce new water supply of up to <br />68,600 AFY on average. Under the current modeling <br />assumptions, the average annual supply to a new <br />East Slope demand is approximately 53,000 AF. <br />About 10,500 AF is from the South Platte River and <br />42,700 AF is from the Green Mountain Reservoir <br />Pumpback. Other benefits of the Green Mountain <br />Reservoir Pumpback include the opportunity to <br />support new West Slope uses from an 85,000 AF <br />(active capacity) Wolcott Reservoir. A conceptual <br />layout of a Green Mountain pumpback is shown in <br />Figure 5-25. <br />5-36 FINAL DRAFT <br />
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