National Dam Safety Program. Leatherwood Creek Number 2A (Inventory Number VA 08905), Roanoke River Basin, Henry County, Virginia. Phase I Inspection Report.
SCHNABEL ENGINEERING ASSOCIATES RICHMOND VA
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Based on criteria established by the Department of the Army, Office of the Chief of Engineers OCE, the appropriate Spillway Design Flood SDF is the 12 PMF. The spillways will pass 30 percent of the Probable Maximum Flood PMF or 60 percent of the SDF without overtopping the dam. During the SDF, the dam will be overtopped for four hours up to a maximum of 3 feet and reach a maximum velocity of 7.4 fps. A dam breach during the SDF would significantly increase the hazard to loss of life downstream of the dam over that which would exist just before overtopping failure. The spillway is judged seriously inadequate. Overtopping is considered detrimental to the embankment with respect to erosion. Due to the inadequacy of the spillway and the resulting overtopping of the dam during the SDF, the potential for a breach of the dam exists. Based upon the possibility of a dam breach caused by overtopping during the SDF, the dam is assessed unsafe, non-emergency.
- Hydrology, Limnology and Potamology
- Civil Engineering