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<br />- 3- <br /> <br />HEC-5 model for reservoir routing and a HEC-RAS model for the downstream flooding impacts. <br />This will help to decide how much to release and at what rate. Currently the operational rule is a <br />maximum release rate of 5,000 cfs. The model is calibrated to 1980, 1983, and 1995 extreme <br />flooding event years. <br />. The reservoir routing involves a large antecedent flood condition, then five days of zero releases, <br />and then increasing 500 cfs/day to a maximum of 5,000 cfs. <br />. At the March 17th meeting the Corps initial HEC-5 modeling showed no additional water supply <br />space is available under existing operational rules. <br />. The Corps is considering a number of new reservoir modification condition; in their reservoir <br />routing model that may show additional water supply space. This will be discussed in more detail <br />at the May 5th meeting. <br /> <br />Wildlife Mitigation Study <br />. Tetra Tech recapped their November 2003 meeting with U.S. Fish & Wildlife Service regprding <br />impacts around Chatfield Reservoir. Initial inventory reports (Biological Resources & Cultural <br />Resources) by Tetra Tech were completed in 2000 and are posted to the CWCB web site at <br />hUp:/ /wvvvv.cwcb.state.co.us/flood watch/ChatfieldWeb-Currentlexisting conditions.htill. <br />. USFWS identified potential impacts to <br />Prebles' Meadow Jumping Mouse, <br />Colorado Butterfly Plant, the Ute <br />Ladies Tresses and possibly the <br />American Bald Eagle. The concern with <br />the bald eagles are that they stop at <br />Chatfield on their way to Cheeseman <br />Reservoir and may be impacted. <br />. The study team will need three good <br />years of inventories and data regarding <br />the plant inventories. Water Users <br />expressed interest in completing <br />inventories. The three-year surveys <br />started in 2003. <br />. Water Users asked for an <br />schematic/time table for completion of <br />this study's requirements. The existing timeline has a completion date of December 31, 2005. <br />. Marc Waage of Denver Water was asked about the ongoing Environmental Assessment (EA) <br />with the Corps regarding impacts of the Denver Water pipeline project installed at the Park. This <br />pipeline pumps water west out of the reservoir across Wadsworth in a carrying ditch to Marston <br />treatment plant. This EA is being considered by the Corps and resources agencies. <br />. The Corps, CWCB and Tetra Tech will meet again with the Fish and Wildlife Service in early <br />summer through the fall of 2004. <br /> <br /> <br />Ute Ladies Tresses with butterfly, Prebles Meadow JlUllpin~ Mouse, and <br />Colorado Butterfly Pant <br /> <br />Initial Reservoir Storage Costs <br />. In response to the water user's requests, the Corps have developed a "straw man" or draft <br />spreadsheet and graphs for the "reallocated storage space costs". <br />. These include only three major elements which are purchasing initial flood control space from <br />the Corps, recreation mitigation costs, and estimated wildlife mitigation costs. <br /> <br />Flood Protection. Water Project Planning and Finance. Stream and Lake Protection <br />Water Supply Protection. Conservation Planning <br />