Evaluation of Alternatives for Providing Minimum Flows Below TVA's South Holston Dam

by J. Stephens Adams, Tennessee Valley Authority, Norris, United States,



Document Type: Proceeding Paper

Part of: Waterpower '91: A New View of Hydro Resources

Abstract:

TVA is in the initial phases of a project to provide minimum flows in the South Fork Holston River below South Holston Dam. The purposes of the minimum flows at South Holston are to enhance the existing fishery (rainbow trout) and help ensure the water supply availability for the city of Bristol, Tennessee. This paper presents the details of a planning study conducted to determine the best alternative for providing the desired minimum flows. Several options were considered, including construction of a flow reregulation weir below South Holston Dam, pulsing the existing power unit, and installing a small generating unit in the existing tailrace. Based on an economic analysis performed for each alternative and consideration of nonmonetary factors, installation of a flow reregulation weir was determined to be the most attractive option. Current plans are to begin construction in the summer of 1991.

Subject Headings: Economic factors | Dams | River flow | Weirs | Water supply | Aquatic habitats | Water flow | Tennessee | United States

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