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' 550 cfs for the capacity to deliver to Horsetooth Reservoir. As shown in Table 9, the additional <br />native water that could have been diverted into the Dille Tunnel averaged 6,950 acre -feet <br />' annually. <br />Finally, Table 10 combines the native water that could have been diverted at these two <br />locations. This water averaged 21,862 acre -feet annually and ranged from none in 1989 and <br />1992 to 92,748 acre -feet in 1983. An average of 18,331 acre -feet or about 84 percent of the <br />total was available in May and June. A comparison of the values from Tables 7 and 10 shows <br />' that 87.3 percent of the divertible excess flow could have been diverted and made part of the <br />project water supply. This is water that could have been diverted under the C -BT Project east <br />' slope water rights and stored in Carter Lake or Horsetooth Reservoir, thus reducing the <br />diversions from the Colorado River basin. <br />IAs indicated above, daily values for the Adams Tunnel diversions were obtained from <br />CDSS. These values include some Wind River water that we have not yet made adjustments for <br />in the calculations. Our estimates for the divertible native water will increase when these <br />adjustments are made. Also, some of the daily South Platte River calls recognized in this <br />process were made under water rights that are junior to the C -BT water rights. The C -BT project <br />could make in- priority diversions on these days. This also tends to underestimate the divertible <br />native flows. <br />' This spreadsheet was also used to calculate the non - charge water that was delivered to <br />the Big Thompson River, but not actually diverted by the Big Thompson water users. This was <br />' accomplished by adding the non - charge deliveries to the native flows that were calculated <br />previously and repeating the comparisons. The deliveries of the non - charge water increased the <br />calculated excess flows in the river on the days when the non - charge deliveries were not <br />diverted or fully diverted. Thus, the calculated excess flows from only native water were <br />subtracted from the excess flows from both native and non - charge water to obtain the non- <br />' charge water that was not diverted. <br />Table 11 summarizes the above - described calculations and derives annual values for <br />the undiverted non - charge water. In column 2, the native flows produced by the Big Thompson <br />River basin at the canyon mouth averaged 132,418 acre -feet annually. In column 3, the portion <br />of the native flow that was not diverted by Big Thompson River water users averaged 29,104 <br />acre -feet annually. This value differs from the value of 25,041 acre -feet annually in Table 7 <br />because of the reductions for the required 45 -cfs bypass at Dille Tunnel and the exclusion of <br />apparent anomalous and isolated diversion days. In column 4, the non - charge water that was <br />delivered to the Big Thompson River averaged 8,720 acre -feet annually during the period. In <br />column 5, the combination of native flow and non - charge water averaged 141,138 acre -feet <br />' annually. In column 6, the portion of this combined native flow and non - charge water that was <br />not diverted by Big Thompson River water users increased to an average of 32,527 acre -feet <br />' annually. Thus, an average of 3,423 acre -feet (32,527 acre -feet — 29,104 acre -feet) annually of <br />the non - charge water or 39.2 percent of the total non - charge was not diverted on the Big <br />1 12 <br />