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Ms. Maryanne C. Bach <br />12/30/99 <br />Page 2 <br />TABLE II - Blue River Water Diversions and Utilization <br />This table shows monthly totals, in acre -feet, for the 1999 water year for Denver's deliveries <br />of Blue River water through the Roberts Tunnel. These figures include water withdrawn <br />from storage in Dillon Reservoir and water diverted directly from the Blue River. Also <br />shown are monthly totals for: 1) carrying charges assessed by the State Engineer on <br />deliveries, 2) the portion of the Roberts Tunnel discharge delivered or exchanged into South <br />Platte storage, 3) the portion used directly, and 4) the amount of Blue River water previously <br />stored in South Platte reservoirs and subsequently released for municipal use in the Denver <br />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 amounts of water delivered by Denver to <br />its treated water and raw water customers during water year 1999. Also shown are monthly <br />amounts of Moffat Tunnel water used from Column 8 of Table I and Blue River water used <br />from Column 6 of Table II. The sum of these two gives the monthly totals of Colorado <br />River water delivered by Denver to its treated and raw water customers. The percentage of <br />Denver's water usage that is Colorado River water was calculated by dividing the amount of <br />Colorado River water usage by the total water usage 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 discharge of effluent during the months of December, January, <br />and February. Utilizing data from these months minimizes or removes the effects of <br />collection line infiltration from the effluent quantities. And, since water usage and, <br />consequently, wastewater production is principally limited to inside uses in the winter and <br />remains relatively constant throughout the year, the base flow amount can be assumed to be <br />available throughout the year. The base flow amounts contain the amounts used in Denver's <br />daily water rights accounting. The monthly totals of effluent base flow were then multiplied <br />by the corresponding monthly percentage of Colorado River usage to yield the quantity of <br />Colorado River water returned through the metropolitan area's wastewater systems. <br />TAB_ LE IV - Successive Use Operations Involving Colorado River Water <br />This table shows monthly totals, in acre -feet, for the 1999 water year for the successive use <br />Denver made of its transmountain return flows. The figures reflect the successive use of a <br />portion of the return flow shown in Column (7) of Table III. Reported in Column (1) of this <br />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 evaporation losses from those reservoirs. This <br />amount of water can be stored in those reservoirs pursuant to the April 12, 1989 decree in <br />the "1940 Agreement" litigation (Case No. 81 -CW -405, Water Division 1). On February 25, <br />1991 the Colorado Supreme Court upheld the trial court's ruling that Denver's May 1, 1940 <br />