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<br />n n'll Tl :1 <br /> <br />To ensure the project continues to operate, Colorado Springs will sometimes divert <br />water at the various diversion locations on the tributary streams and release water from <br />Homestake Reservoir to satisfy the bypass requirement at the Gold Park Gage (USGS Gage <br />No. 09064000). <br /> <br />According to Colorado Springs personnel, the Gold Park Gage tends to restrict <br />diversions more frequently than a "call" from the main stem of the Colorado River. The <br />effect of this bypass requirement at the Gold Park gage is to reduce diversions on both <br />ends of the seasonal hydrograph, curtailing the normal diversion season by an average of <br />two to three weeks each year. <br />CROSS CONSIDERATIONS <br /> <br />1. For simplification of operations in the CROSS Water Rights Planning Model <br />(WRPM). the Homestake Project collection facilities are represented as a single <br />node in the network, being the Missouri Tunnel (WOlD 374643). Cumulatively, this <br />node represents the Project diversions from French, Fancy, Missouri, and Sopris <br />Creeks. Total contributing drainage area to this node is 11.3 square miles. <br /> <br />Inflows from the Middle Fork of Homestake Creek and diversions from the East <br />Fork of Homestake Creek are assumed to be reflected in the historic end-of-month <br />storage contents data for Homestake Reservoir, provided by Colorado Springs. <br />Total contributing drainage from Middle Fork is 7.4 square miles and the East Fork <br />is 6.5 square miles for a total of 13.9 square miles. <br /> <br />2. In the CROSS WRPM, the remainder of the Homestake Project is represented by <br />two additional nodes: Homestake Reservoir (WOlD 374516) and the Homestake <br />Tunnel (WOlD 374614). The historic time series of diversions through the <br />Homestake Tunnel, as provided by Colorado Springs, represents the total historic <br />transmountain diversion to the eastern slope by the cities of Aurora and Colorado <br />Springs. <br /> <br />3. For historic and calibration modelling scenarios, allowances for the minimum flow <br />bypass requirements at each of the individual diversion points on the tributary <br />streams, are assumed to be reflected in the historic diversion data provided by <br />Colorado Springs. For future operational scenarios, the project should be operated <br />to ensure the minimum flow required at the Gold Park streamgage (09064000), <br />being 24 cfs, <br /> <br />4. At this level of development for the CRDSS WRPM, it is not necessary to allocate <br />project yield, including storage in Homestake Reservoir as between Aurora and <br />Colorado Springs. <br /> <br />5. Historic demands at the Homestake Tunnel should be based on the diversion data <br />provided by Colorado Springs. Additional input from Aurora and Colorado Springs <br />may be required to estimate future demands for future operational scenarios. not <br />to exceed a flow rate of 300 cfs through the tunnel. <br /> <br />H-3 <br />