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Mr. Neil Stessman <br />12/24/97 <br />Page 2 <br />TABLE I - Moffat Tunnel Water Diversions and Utilization <br />This table shows monthly totals, in acre -feet, for the 1997 water year for Denver's <br />diversions from the Williams Fork and Fraser Rivers. Also shown are monthly <br />totals for: 1) the carrying charges assessed by the State Engineer on these <br />diversions, 2) the portion used directly, and 3) the amount of Fraser - Williams <br />Fork water previously stored and subsequently released for use in the Denver <br />area. The diversions also include Cabin- Meadow Creek water Denver is entitled <br />to use by contract. <br />TABLE II - Blue River Water Diversions and Utilization <br />This table shows monthly totals, in acre -feet, for the 1997 water year for Denver's <br />deliveries of Blue River water through the Roberts Tunnel. These figures include <br />water withdrawn from storage in Dillon Reservoir and water diverted directly <br />from the Blue River. Also shown are monthly totals for: 1) carrying charges <br />assessed by the State Engineer on deliveries, 2) the portion of the Roberts Tunnel- <br />discharge delivered or exchanged into South Platte storage, 3) the portion used <br />directly, and 4) the amount of Blue River water previously stored in South Platte <br />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 <br />Colorado River water used by Denver that returns to the South Platte River <br />through wastewater treatment plants. The table presents total monthly amounts <br />of water delivered by Denver to its treated water and raw water customers <br />during water year 1997. Also shown are monthly amounts of Moffat Tunnel <br />water used from Column 8 of Table I and Blue River water used from Column 6 <br />of Table H. The sum of these two gives the monthly totals of Colorado River <br />water delivered by Denver to its treated and raw water customers. The <br />percentage of Denver's water usage that is Colorado River water was calculated <br />by dividing the amount of Colorado River water usage by the total water usage <br />and appears in Column 5 of the table. Column 6 shows the monthly amounts of <br />wastewater effluent base flow from Denver's customers. Base flow is the <br />discharge of effluent during the months of December, January, and February. <br />Utilizing data from these months minimizes or removes the effects of collection <br />line infiltration from the effluent quantities. And, since water usage and, <br />consequently, wastewater production is principally limited to inside uses in the <br />winter and remains relatively constant throughout the year, the base flow amount <br />can be assumed to be available throughout the year. The monthly totals of <br />effluent base flow were then multiplied by the corresponding monthly percentage <br />