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Durango RICD <br />D. Randolph Seaholm Supplemental Report <br />February 20, 2007 <br />• Page 4 of 4 <br />major tributaries based on the amount of flow originating in each of the major tributaries. Based <br />on this proportioning concept, out of the approximately 10.8 million acre -feet originating in the <br />Colorado River basin in Colorado, an estimated 17.95 % originated in the San Juan River Basin, <br />thus new uses in the San Juan River would be allowed to deplete 17.95 % of Colorado's <br />remaining apportionment. The report estimated that on the low end this was approximately <br />450,000 acre -feet. On the high end it assumed full compact development which would allow for <br />an additional 1,200,000 acre -feet. Using 17.95 % of the low end value of 450,000 acre -feet met <br />approximately 80,800 acre -feet was the San Juan's proportionate share of the remaining compact <br />apportionment. This was as far as the 1995 report went. <br />If the same logic is applied within the San Juan Basin, the Animas River at Stateline contributes <br />approximately 40 % of the flow originating in the San Juan Basin (670,100 / 1,681,470 acre -feet <br />based on the 2003 version of the State Engineer's Snake Diagram of flows). Thus, the Animas <br />River Basin would be entitled to 32,200 acre -feet of the future depletion. If full compact <br />development were achieved, the San Juan Basin would be entitled to an additional 225,000 acre - <br />feet, which then translates into 90,000 acre -feet for the Animas. <br />The point of this analysis is to try an illustrate some type of an equitable sharing of Colorado's <br />remaining apportionment and as the 1995 report recommended, retain as much flexibility as <br />possible when considering how to develop that remain apportionment. The Durango RICD as <br />applied for does not allow for the Animas Basin to develop a proportional share of Colorado's <br />. remaining compact apportionment and significantly limits the flexibility to do so. <br />• <br />Flood Protection • Water Project Planning and Finance • Stream and Lake Protection <br />Water Supply Protection • Conservation Planning <br />