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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 />I <br /> <br />Stream flow can be most effective as a supplementary drought indicator, when it is used <br />with monitoring reservoir storage. <br /> <br />2.2.3 Reservoir Volume. Each reservo'~r was analyzed independently and then in the <br />context of the whole system to assess the _reservoir's' value as an indicator of the total <br />available volume of the system. Plots of usable volume versus percentage of volume <br />remaining for each reservoir and the corflbine~t system storage are shown on Figure 11. <br />Lake Howell contains approximately 74% of the usable volume of the system; <br />Kannapolis Lake and Lake Fisher contain approximately 13% and 11%, respectively; and <br />Lake Concord contains about 2% of the usable volume of the system. <br /> <br />8O00 <br /> <br />7OOO <br /> <br />6000 <br /> <br />'~5000 <br /> <br /> 4000 <br /> <br /> 3000 <br /> 2000 <br /> 1000 <br /> <br />0: <br />0% 10% <br /> <br />20% 30% 40% 50% 60% 70% 80% 90% 100'/~ <br /> % Vol. Remaining <br /> <br />I <br />I <br /> <br />Figure 11. Distribuuon of storage of usable volume for the sy, stem <br /> <br />Because of its dominating share of the total system storage, only Lake Howell can <br />reasonably represent the condition of the total system storage. Drought operating curves <br />that correspond to usable volume will use the storage contained in Lake Howell as the <br />primary drought stage indicator. <br /> <br /> 1 <br />PN 096873.0800 ILmm~, <br />January 23, 2004 BLACK & VEATCH <br /> ~.~ ,ntematmon,l Company <br /> <br /> <br />