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Last modified
7/29/2009 9:52:59 PM
Creation date
10/12/2006 3:17:23 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8046
Description
Section D General Studies - DSS
State
CO
Water Division
1
Date
2/6/1996
Author
George M Fosha
Title
Colorado Decision Support System - 1997-2001 - 1332.2 CRDSS - Colorado Documentation - Denver Water (Moffat Tunnel System and Dillon/Roberts Tunnel System)
Water Supply Pro - Doc Type
Report/Study
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<br />'OOO(~~jh <br /> <br />power plant on the outlet from the reservoir. Since that time, there has been adequate <br />water available to operate the power plant at rates of about 100 cfs (rather than the <br />minimum of 50 cfs). For future scenarios in the CRDSS, the required release should be 50 <br />cfs. <br /> <br />(7) When water is stored in Dillon Reservoir, out of priority with respect to Green Mountain <br />Reservoir, the first 1,000 acre-feet of this storage is allocated to a temporary storage <br />account (the '1,000 Acre-Foot Pool'). which is essentially Green Mountain water stored <br />in Dillon. Water in this account is to be released from Dillon Reservoir as necessary to <br />maintain flows at 50 cfs, immediately downstream of the Dillon Dam. If Green Mountain <br />Reservoir fails to fill, Denver repays Green Mountain first with any water remaining in this <br />temporary 1,'()0(hcre-foot storage account,(if necessary to increase the flow below Dillon <br />Dam to 50 cfs) and then by an exchange from Williams Fork Reservoir and/or Wolford <br />Mountain Reservoir. On April 15 of each year, if it is determined that Green Mountain will <br />fill, any water remaining in the 1,000 Acre'Foot Pool will be booked over into Denver's <br />storage in Dillon. <br /> <br />Summit County Aareement <br /> <br />Pursuant to negotiations for the 'anticipated construction of Denver's Two Forks Reservoir, <br />Denver entered into a September 1985 agreement with Summit County in which the County <br />agreed to support the Two Forks Project and Denver agreed to subordinate a portion of its Blue <br />River water rights (Dillon Reservoir and Roberts Tunnel) to provide water for new uses in the <br />County. The agreement gave Summit County the right to divert and consume up to 3,100 acre- <br />feet of water annually at locations upstream of Green Mountain Reservoir. Of this amount, 1,750 <br />acre-feet were to be used for domestic, municipal, commercial and irrigation (M & I Water) and <br />1,350 acre-feet were to be used for snowmaking purposes. <br /> <br />In order to compensate Denver for the loss of water resulting from the subordination, the <br />County agreed to provide Denver with 1,211 acre-feet of contract water from Green Mountain <br />Reservoir or from some other acceptable source, including: (a) Water from Granby Reservoir <br />pursuant to the Middle Park Water Conservancy District's contract; (b) irrigation water rights <br />owned by the Town of Breckenridge. The required amount of replacement is computed as: (1) <br />0.58 acre-foot of replacement water for each consumptive acre-foot of water used for M & I uses; <br />and (2) 0.145 acre-foot for each acre-foot diverted for snowmaking. <br /> <br />Through its own studies, Denver determined that the total 'consumptive use' that could <br />potentially result from implementation of the Summit County Agreement would be about 2,088 <br />acre-feet, assuming 100% of the M & I water (1,750 acre-feet) and 25% of the snowmaking <br />water would be consumed. <br /> <br />The Summit County Agreement also contains a number of other provisions, including: (e) <br />An agreement to release up to 100 ,acre-feet of water per year from Dillon Reservoir to be used <br />by the County for augmentation when junior rights in the County would be called out by senior <br />rights downstream of Dillon Reservoir. (In this situation, the County agreed to pay back Denver <br />1.4 acre-feet for each acre-foot of water released from the reservoir); (b) An agreement to release <br />up to 300 acre-feet for augmentation purposes by the Town of Silverthorne; (c) An agreement to <br /> <br />0-10 <br />
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