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Parkville Water District Agenda Item 23c September 15-17,2015 Board Meeting(Updated September 18, 2015) Page 3 of 8 Water Rights The Districts primary source of water is Evans Gulch. The District has incorporated an additional source of supply from three wells along the East Fork of the Arkansas River. Other sources include the Iowa Gulch, Empire Gulch, and the Canterbury Tunnel. The District's current annual delivery is approximately 1,500 AF. The following table shows a summary of the District's water rights and approximate yields available from each water right: The District has the following decreed water rights: TABLE 1: WATER RIGHTS Name Amount Appropriation Adjudication Water Court Case Date Date No. Starr Ditch 2.15 CFS 5/1/1860 9/10/1904 CA1856 Iron Silver Mining 4.3 CFS 5/1/1862 9/10/1904 CA1856 Co. Ditch Evans Gulch Branch Iron Silver 2.2 CFS 6/1/1863 9/10/1904 95CW0006 Mining Co. Ditch _ Evans Gulch 189 AF 10/6/1887 9/10/1904 CA1856 Reservoir No 2 Evans Gulch 23 AF 1879/1903 9/10/1904 CA1856 Reservoir Mountain Lake 122 AF 1889/1902 9/10/1904 CA1856 Reservoir Iowa Gulch 11.7370 CFS 7/10/1860 9/10/1904 95CW0006 Stevens Et Leiter 3 CFS 9/1/1873 9/10/1904 CA4918 Ditch Blow Ditch 2 CFS 12/1/1890 9/10/1904 CA1856 Empire Creek Project Description The goal of this Project is to restore the District's flume to provide safe diversion of flows around the District's water supply reservoir and to protect the integrity of the reservoir's dam embankment. The following alternatives were considered: Alternative 1 - Do Nothing: This alternative was considered undesirable due to risk of failure of the flume or the dam, and the high cost (approximately $10,000 annually) of maintenance of the existing flume. Breaching of the flume into the storage reservoir could damage the water treatment plant, leaving the District's water users without water supply for several days. The State Dam Safety Engineer has also recommended the flume be replaced. Selected Alternative 2 - Construct new flume with same alignment: This alternative provides for replacement of the existing flume with twin solid-wall HDPE pipes for durability and resistance to high- turbidity flows, as well as construction of new inlet and outlet structures. Open structures were cost prohibitive and safety concerns would remain, thus the consideration of a closed pipe design. The proposed twin 48" HDPE pipes will also have significantly more capacity than the existing flume. Project savings could result from eliminating the new inlet and outlet structures, but the dam would then have less protection from erosion, as a discharge structure is needed to dissipate the energy of high velocity flows. This option is the lowest cost option deemed acceptable by the State Dam Safety Engineer.