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Correspondences Concerning City of Denver's Use of Colorado River Water (2002)
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Correspondences Concerning City of Denver's Use of Colorado River Water (2002)
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Last modified
11/10/2015 8:53:05 AM
Creation date
2/12/2014 11:22:36 AM
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Water Supply Protection
Description
Report on Colorado River water use by Denver for the 2001 water year.
State
CO
Basin
Colorado Mainstem
South Platte
Water Division
5
Date
1/24/2002
Author
Various
Title
Correspondenes Concerning City of Denver's Use of Colorado River Water (2002)
Water Supply Pro - Doc Type
Correspondence
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Ms. Maryanne C. Bach <br />12/28/2001 <br />Page 2 <br />TABLE II - Blue River Water Diversions and Utilization <br />This table shows monthly totals, in acre -feet, for Denver's deliveries of Blue River water <br />through the Roberts Tunnel. These figures include water withdrawn from storage in <br />Dillon Reservoir and water diverted directly from the Blue River. Also shown are <br />monthly totals for: 1) carrying charges assessed by the State Engineer on deliveries, 2) the <br />portion of the Roberts Tunnel discharge delivered or exchanged into South Platte storage, <br />3) the portion used directly, and 4) the amount of Blue River water previously stored in <br />South Platte reservoirs and subsequently released for municipal use in the Denver area. <br />TABLE III - Return Flow of Colorado River Water <br />This table presents the calculations to determine the percentage and amount of Colorado <br />River water used by Denver that returns to the South Platte River through wastewater <br />treatment plants. The table presents total monthly amount of water delivered by Denver <br />to its treated water and raw water customers. Also shown are monthly amounts of Moffat <br />Tunnel water used from Column 8 of Table I and Blue River water used from Column 6 of <br />Table II. The sum of these two gives the total Colorado River water delivered by Denver <br />to its treated and raw water customers. The percentage of Denver's water use that is <br />Colorado River water is calculated by dividing the amount of Colorado River water <br />delivered by the total water use and appears in Column 5 of the table. <br />Column 6 shows the monthly amounts of wastewater effluent base flow from Denver's <br />customers. Base flow is the quantity of effluent determined to be available during the <br />months of December, January, and February. Utilizing data from these months minimizes <br />or removes the effects of collection line infiltration from the effluent quantities. And, since <br />winter water usage is principally limited to inside uses and is lowest during this period, <br />the result wastewater flows can be assumed to be available throughout the year. The base <br />flow amounts in Table IV contain the quantities used in Denver's daily water rights <br />accounting. The monthly totals of effluent base flow were then multiplied by the <br />corresponding monthly percentage of Colorado River water usage to yield the quantity of <br />Colorado River water returned to the South Platte River through the metropolitan area's <br />wastewater systems. <br />TABLE IV - Successive Use Operations Involving Colorado River Water <br />This table shows monthly totals, in acre -feet, for the 2001 water year for the successive use <br />Denver made of its Colorado River return flows. The figures reflect the successive use of <br />a portion of the return flow shown in Column (7) of Table III. Reported in Column (1) of <br />this table is the amount of transmountain effluent exchanged to South Platte Reservoirs <br />attributable to Colorado River water imported through the Roberts Tunnel and Cabin - <br />Meadow Creek water imported through the Moffat Tunnel and used under contract by <br />Denver. Column (2) shows the amount of water stored in Antero, Eleven Mile, and <br />Cheesman Reservoirs equivalent to the out -of- priority evaporation losses from those <br />reservoirs. This amount of water can be stored in those reservoirs pursuant to the April <br />12, 1989 decree in the "1940 Agreement" litigation (Case No. 81 -CW -405, Water Division <br />1). On February 25, 1991, the Colorado Supreme Court upheld the trial court's ruling that <br />Denver's May 1, 1940 agreement with members of Consolidated Ditches precludes <br />
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