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~ Water & Sewer Authority of Cabarrus County <br />WSACC Water and Wastewater System Master Plan <br /> <br />Safe Yield Update and Regional Drought Operations <br /> <br />-I <br /> I <br /> <br />Appendix B: Black Run' Reservoir Safe Yield <br /> <br />The Water and Sewer Authority of Cabarrus County owns and operates the Mount <br />Pleasant water supply and treatment system. The system consists of a water treatment <br />plant with an intake structure on the Dutch Buffalo Creek and an offline reservoir that <br />impounds water from Black Run. The reservoir supplements the creek's stream flow <br />during periods of Iow-flow_ conditions, as Black Run is a tributary of Dutch Buffalo <br />Creek and is located upstream of the water treatment plant's intake structure. The figure <br />below shows the stage-storage relationship at Black Run Reservoir, created from the <br />recent bathymetric survey. A total storage volume of 177.4 million gallons is estimated, <br />and because of the reservoir outlet configuration, all of that volume is assumed usable. A <br />minimum of 0.2 cfs is required to be released from the reservoir on Black Run through an <br />outlet pipe. <br /> <br /> 200.0 <br /> <br /> 180.0 <br /> <br /> 160.0 ; <br /> 140.0 <br /> <br /> 120.0 <br />100.0 - <br /> <br /> 80.0 - <br /> <br /> 60.0 - <br /> <br /> Stage (ft) <br /> <br />Figure B-1. Black Run Reservoir stage-storage relationship <br /> <br />The safe yield of Black Run is estimated based on a comparison with other reservoirs for <br />which mass-balance models were developed. The following assumptions are used: <br /> <br /> · The inflow characteristics of Black Run are similar to those of the tributaries <br /> to Lake Concord and Lake Fisher. <br /> <br />PN 096873.0800 34 ~'Jl, <br />January 23, 2004 BLACK & VEATCH <br /> ~ ~- + International Company <br /> <br /> <br />