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Last modified
1/26/2010 4:34:46 PM
Creation date
4/3/2008 1:53:01 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8430.500
Description
Denver Water
State
CO
Basin
Statewide
Date
1/16/2004
Author
USDOI?BOR
Title
City of Denver's Water Use of Colorado River Water - Water Year 2003
Water Supply Pro - Doc Type
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<br />Ms. Maryanne C. Bach <br />[)ecernber 30, 2003 <br />Page 3 <br /> <br />reservoirs. This amount of water can be stored in those reservoirs pursuant to the <br />April 12, 1989 decree in the "1940 Agreement" litigation (Case No. 81-CW-405, Water <br />Division 1). On February 25, 1991, the Colorado Supreme Court upheld the trial court's <br />ruling that Denver's May I, 1940 agreement with members of Consolidated Ditches <br />precludes Denver from reusing return flows from Colorado River water appropriated <br />prior to May I, 1940, unless acquired after 1940. In lieu of not reusing pre-1940 water, <br />Denver is not required to compensate the stream for evaporative losses at Antero, Eleven <br />Mile, and Cheesman Reservoirs. Since Denver is effectively replacing these evaporative <br />losses with a portion of return flows from Colorado River water, Denver is claiming <br />successive use credit as shown in Column (2) of Table N. <br /> <br />West Slope Storage <br />The following information on Denver Water's west slope storage is provided for your <br />information. Authorized storage in Dillon Reservoir on September 30, 2002, was <br />152,668 acre-feet and on September 30,2003, it was 245,886 acre-feet, for a net change of <br />+93,218 acre-feet. Similarly, on September 30,2002, authorized storage in Williams Fork <br />Reservoir was 21,187 acre-feet and on September 30, 2003, it was 70,509 acre-feet, a net <br />change of +49,322 acre-feet. <br /> <br />Successive Use Program <br />Denver's main source of reusable water is the Colorado River basin although a small <br />amount of reusable water originates from the South Platte basin. Reusable water <br />returning to the South Platte River after use is termed reusable return flow. Reusable <br />effluent is reusable return flow from sewered uses that returns to the South Platte via <br />wastewater treatment plants. <br /> <br />Denver Water's reservoir storage improved dramatically during 2003 following the record <br />drought conditions in 2002. However, total storage in Denver's system is still about 10% <br />below normal. In particular, in the South Platte basin above Denver's facilities, natural <br />stream flows remained significantly below normal and opportunities for exchanges of <br />reusable effluent were somewhat limited. During the water year, Denver reclaimed <br />31,492 acre-feet of reusable effluent for beneficial use in the Denver metropolitan area of <br />which 17,094 acre-feet was exchanged effluent. Reservoir evaporation made up <br />6,659 acre-feet of this total. The remaining 7,739 acre-feet was made up of leased effluent. <br />The total successive use volume was 56% of the total Colorado River return flow in water <br />year 2003. The average percent of return flow successively used since 1966 is 30%. This <br />year's volume of successive use is 211% of the average successive use since 1966. <br /> <br />Denver continues to actively pursue maximizing its use of Colorado River return flows. <br />During 2003, Denver continued to pursue implementation of the Denver Board of Water <br />Commissioner's near term water supply strategy for producing 55,000 acre-feet of water <br />needed to extend Denver's water supply to the year 2030. The strategy contains the <br />elements of non-potable reuse, small-scale system refinements, water conservation, and <br />cooperative supply projects. These elements were selected after completion of Denver <br />
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