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LAKE DECATUR <br /> SEDIMENTNVATER STORAGE <br /> PROJECT <br /> »� <br /> City Council Presentation <br /> September 19, 2005 <br /> Why is action needed? <br /> • By Spring 2008, the City will need a site located south of Lake Decatur for the storage of about 2000 <br /> acre-feet of dredge sediment from the Big Creek and Sand Creek Basins. <br /> • Even with limited increases in water demand, by 2025 the City and its water customers will face a <br /> 10% annual risk of not having sufficient water supply to meet their needs during a severe drought. <br /> What action is recommended? <br /> • Construct a new sediment storage facility to receive materials from dredging of the Big Creek and <br /> Sand Creek Basins. Approximately 640 acres of land will be required. <br /> • After completion of the dredging program, e facility embankments would be raised to provide above- <br /> ground water storage capacity and reduce the risk of shortage during a drought. <br /> • Depending on the site chosen, it may be possible to incorporate features into the design of the <br /> reservoir to support residential, commercial, and/or recreational development adjacent to the facility. <br /> When would these facilities be put to use? , <br /> • 2006-2008: Design and construction of a new sediment storage facility ' <br /> • 2008-2012: Use of the new facility for storage of dredged sediments from Lake Decatur �i <br /> • 2012-2014: Conversion of the facility for off-stream water storage <br /> • After 2014: Off-stream water storage reservoir in operation <br /> Where would the facilities be located? <br /> • Preliminary studies indicate that several sites south of Lake Decatur could be developed for sediment <br /> storage and expanded to support future construction of an off-stream water storage capacity <br /> How much would construction of the sediment and water storage facility cost? <br /> • New Sediment Storage Facility $ 20-25 million <br /> • Conversion of the Sediment Storage Facility to Off-Stream Water Storage $ 12-15 million <br /> • Estimated Total Project Cost(2004 dollars) $ 32-40 million <br /> • Savings over Cost of Independent Sediment and Water Storage Projects approx. $ 10 million <br /> How would the proposed facilities benefit the City and City water customers? <br /> • A new sediment storage site is required to allow the City to continue its current program for dredging. <br /> Dredging is required to protect the storage capacity and high recreational value of Lake Decatur. <br /> • Construction of a new off-stream water storage reservoir will significantly increase the reliability of the <br /> water supply for the City of Decatur and its water customers during periods of severe drought. <br /> • Over time, tax revenue from high quality development adjacent to a new off-stream water storage <br /> reservoir could offset the investment associated with conversion of the sediment storage facility. <br /> � 1111�1�1 <br />