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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 Operatlon~ <br /> <br />Location: Potomac River Basin <br /> <br />Management Agency: Section for Cooperative Water Supply Operations of the Interstate <br />Commission on the Potomac River Basin (CO-OP) <br /> <br />Drought Indicator(s): [~Reservoir Water Levels <br /> [--]Stream Flows <br /> [~]Water Production and Distribution Capabilities <br /> [-]Drawdown Rates <br />  Precipitation Outlook <br /> Daily Water Use Patterns <br /> [-]Seasonal and Long-Term Weather Patterns <br /> [~]Availability of Water from Other Sources <br /> [~Other:National Weather Service Drought Monitoring <br />Additional Information: <br />"Interstate Commission on the Potomac River Basin" <br />http://www.potomacriver.org/ <br />Interstate Commission on the Potomac River Basin (2003) <br /> <br />Program Summary <br /> <br />The Potomac River Basin drains portions of four states (Virginia, Maryland, Pennsylvania, and <br />West Virginia) and the District of Columbia. In 1940, these states, the District of Columbia, and <br />the United States Congress created the Interstate Commission on the Potomac River Basin <br />(ICPRB) to protect the basin's water resources. <br /> <br />Cooperative agreements among the ICPRB and the three major Washington metropolitan area <br />water utilities - Fairfax County Water Authority (FCWA), Washington Suburban Sanitary <br />Commission (WSSC), and the Washington Aqueduct Division (WAD) of the Corps of EngineOrs <br />- govern water resource management in the Potomac River Basin. Under the 1978 Low Flow <br />Allocation Agreement (LFAA) and the 1982 Water Supply Coordination Agreement (WSCA), <br />deteriorating drought conditions defined by low river flows initiate coordinated water supply <br />management operations, which include releases from regional reservoirs to meet municipal <br />demands and minimum flow requirements. Additionally, the LFAA established a formula based <br />on the utility's average daily "winter" use for determining water allocation during times of <br />drought. The CO-OP suppliers share the cost of operating and maintaining the Potomac storage <br />reservoirs along with the funding for cooperative committee operations and supporting studies, <br />such as regular water supply-demand projection analysis updates. <br /> <br />In addition to the CO-OP agreements, the Metropolitan Washington Council 6f Governments <br />(MWCOG) monitors regional drought conditions and maintains a drought awareness and <br />response plan. This plan addresses the need for regional drought .management for water sources <br />outside of those governod by the LFAA and WSCA. For example, WSSC and FCWA each <br />independently own and operate water supply reservoirs located on Potomac River tributaries. <br />The plan outlines coordinated public drought response actions as follows: call for 'voluntary <br />conservation under a drought watch, require voluntary water restrictions under a drought warning, <br />and implement mandatory water restrictions under a drought emergency. <br /> <br />PN 096873.0800 3 1 <br />January 23, 2004 BLACK & VEATCH <br /> <br /> <br />