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~ Water & Sewer Authority of Cabarrus County <br />W~CC Water and Wastewater System Master Plan <br /> <br />Safe Yield Update and Regional Drought Operations <br /> <br />EVAP <br />SPILL <br />MIF <br /> <br />= volume of lake evaporation during the month. <br />= volume of spillway overflows during the month. <br />= minimum release downstream of the dam and intake <br /> <br />1,2 Reservoir Volume Update <br />Updated bathymetric data including elevation, storage and surface area of the four <br />reservoirs--Howell, Kannapolis, Fisher and Concord--was provided by the City of <br />Concord. The data provides current information on lake bottom contours and the storage <br />capacity of each reservoir. Using this information, the effects of sedimentation over time <br />can be observed. <br /> <br />The updated bathymetric data showed reduced storage volumes at full-pool elevations for <br />Lake Howell and Kannapolis Lake. The recent survey of Lake Howell is compared to <br />historical data, and a loss of 734 million gallons of storage is observed, as shown on <br />Figure 2. <br /> <br /> 8OOO <br /> <br /> ?000 <br /> <br /> 8OOO <br /> <br />20~ <br /> <br />1000 <br /> <br />0 <br /> 610 <br /> <br />820 825 830 e35 840 845 650 855 <br /> Stage (ft) ~ <br /> <br />Figure 2. Lake Howell stage-storage volume update <br /> <br />Data obtained from the recent survey of Lake Kannapolis is compared to historical data, <br />and a loss of 94 million gallons of total storage is observed, as shown in Figure 3. The <br />surveys of Lake Fisher and Lake Concord provided information that was not previously <br /> <br />PN 096873.0800 2 ETJ, <br />January 23, 2004 ~__~. + BLACK & VEATCH <br /> ~ International Company <br /> <br /> <br />