Improving Streamflow and Water Quality Below Dams

by R. J. Ruane, (A.M.ASCE), TVA, Chattanooga, TN, USA,
C. E. Bohac, TVA, Chattanooga, TN, USA,
J. L. Davis, TVA, Chattanooga, TN, USA,
E. D. Harshbarger, TVA, Chattanooga, TN, USA,
R. M. Shane, TVA, Chattanooga, TN, USA,
H. M. Goranflo, TVA, Chattanooga, TN, USA,

Document Type: Proceeding Paper

Part of: Water Forum '86: World Water Issues in Evolution


Progress by the Tennessee Valley Authority on improving dissolved oxygen (DO) and flow conditions below hydropower projects is discussed. New methods of turbine venting have resulted in DO increases of up to 4. 0 mg/L with efficiency losses of about 0. 5%. A reregulation weir made with gabions has provided a continuous minimum streamflow of 200 cfs (5. 7 m**3/s) below a hydropower project where there previously was only leakage for extended periods. At a second project comparisons between sluicing, adding a small hydroturbine to the powerhouse, providing a reregulating weir, and pulsing of the existing turbines, resulted in the selection of a small hydro addition to provide a continuous minimum flow below the project.

Subject Headings: Water quality | Streamflow | Dams | Water pollution | Water resources | Weirs | Turbines | Dissolved oxygen | Tennessee | United States

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