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~ Water & Sewer Authority of Cabarrus County <br />VV~CC Water and Wastewater System Master Plan <br /> <br />Safe Yield Update and Regional Drought Operations <br /> <br /> Table 4 <br /> Reservoir Yield Estimates (mgd) <br /> <br /> Water Source 1999 Report~ 2002 Master Plan 2003 Update <br /> <br /> 20-yr 20-yr 50-yr 50-yr 100-yr <br /> Lake Howell 23.80 21.60 17.60 16.20 7.05 <br /> <br />Kannapolis Lake .......... 8.60 8.50 5.70 <br /> <br /> Lake Fisher 7.10 6.30 6.30 5.15 3.00 <br /> Lake Concord 1.90 1.70 1.70 1.20 0.70 <br /> <br />~ Water Supply Draft Rates, Woolpert, for City of Concord, December 1999. <br /> <br />Reservoir safe yield numbers appropriate for operation and management of the water <br />supplies, in accordance with North Carolina guidelines follow: <br /> · Lake Howell = 16.2 mgd. <br /> <br /> · Kannapolis Lake = 8.5 mgd. <br /> · Lake Fisher = 5.15 mgd. <br /> · Lake Concord = 1.2 mgd. <br /> <br />' Results of the simulation of each reservoir, settirlg the fixed withdrawal rate equal to <br /> these 50-year safe yields, are shown in Figures 7, 8, 9, and 10. <br /> <br />It is significant to note that during the recent drought, withdrawals equal to the 50-year <br />safe yield values could not have been sustained.' The total safe yield from the four lakes <br />equals 31.05 mgd,. considering a 50-year recurrence, and reduces to 16.45 mgd, <br />considering a 100-year recurrence. A drought management strategy is needed to manage <br />the sources, in conjunction with water use reductions and purchase of additional supplies, <br />to ~nsure safe and reliable operations. Drought management considerations and a <br />recommended approach are discussed in the following sections. <br /> <br />PN096873.0800 9 [~. <br /> <br />danua~ 23,2004 <br /> <br />BLACK & VEATCH <br /> International Company <br /> <br /> <br />