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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />. <br />. <br />. <br />.. <br />I <br /> <br />Chapter 1: South Platte Basin Inventory <br /> <br />March 21.1998 <br />Page 1-11 <br /> <br />Denver's model does not include several junior water rights which could affect <br />South Platte flows at the Chatfield, Denver and Henderson gages. These include: 1) <br />Thornton's junior water rights at the Burlington Ditch and its conditional exchange rights <br />from Metro to the Burlington Ditch and to various locations on Clear Creek; 2) Aurora's <br />junior storage rights at Spinney Mountain Reservoir; and 3) Englewood's exchange <br />rights from the St Vrain and from Clear Creek to Chatfield Reservoir. These rights <br />were not included in Denver's model because they are junior to Denver's water rights <br />and would not affect Denver's system yield. They would, however, affect stream flows <br />primarily at the Henderson gage and to lesser degrees at the Denver and Chatfield <br />gages. These water rights would reduce future flows primarily during the months of <br />May through August when stream flows are relatively high. However, the future <br />exercise of these water rights will be highly variable due to constraints of stream flows, <br />call conditions, water quality and water demands, It is therefore unlikely that these <br />water rights would be fully utilized every year. A full analysis of the effects of these <br />rights was beyond the scope of this study. Based on a review of the water rights and <br />flow conditions involved it was assumed for the purposes of this study that these rights <br />would reduce average flows at the Henderson gage by 100 cfs during May though <br />August Denver's modeled flows at Henderson were adjusted accordingly. <br /> <br />Estimated future flows for the South Platte, Chatfield, Denver and Henderson <br />gages are shown in Tables 1-11 through 1-14 and Figures 1-11 through 1-14. <br /> <br />1,1.4.2 Kersey Gage <br /> <br />To develop estimated future flows for the Kersey gage, we adjusted the historical <br />Kersey gage flows to reflect the following: 1) changes in flows at the Henderson gage <br />due to future operations of metro Denver area water supply systems as modeled by <br />Denver Water and adjusted, described above; 2) changes in historical flows from the 51. <br />Vrain, Big Thompson and Cache La Poudre basins due to increased municipal and <br />industrial water use in these basins, future Windy Gap project water deliveries, and to <br />account for the fact that Colorado-Big Thompson project deliveries did not reach full <br />levels until 1953; and 3) changes in diversions by District 2 irrigation ditches in <br />response to future changes in supplies, <br /> <br />Chanaes in Flow at Henderson Gaae. <br /> <br />Changes in flows at the Henderson gage due to future operations of <br />metro Denver area water supply systems located upstream of Henderson was <br />calculated as the difference between historical Henderson gage flows and <br />adjusted Denver Water modeled future Henderson flows, These differences <br />were added to the Kersey gage after adjusting for changes in diversions by <br />District 2 ditches as discussed below, <br /> <br />Hydrosphere Resource Consuttants. 1002 Walnut Sutte 200, Boulder, CO 80302 <br />