National Dam Safety Program. Greene Mountain Lake Dam (Inventory Number VA 07915), Rivanna River Basin, Greene County, Virginia. Phase I Inspection Report.
SCHNABEL ENGINEERING ASSOCIATES RICHMOND VA
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The Dam is a zoned earthfill structure about 450 ft long and 33 ft high. The principal spillway consists of a 66 inch diameter corrugated metal pipe CMP riser inlet, and a 60 inch diameter CMP outlet which extends through the structure. An earth emergency spillway is located at the right abutment with a 90 ft wide bottom and 3H1V side slopes. 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 spillway is judged seriously inadequate due to the detrimental effect of overtopping during the SDF. Based upon the possibility of a dam breach caused by overtopping during the SDF, the dam is assessed unsafe, non-emergency. It is recommended that a qualified engineering firm be retained to perform a detailed hydrologichydraulic analysis of the dam and downstream damage reach.
- Hydrology, Limnology and Potamology
- Civil Engineering