National Dam Safety Program. Hidden Valley Lake (Inventory Number VA 19104) Tennessee River Basin, Washington County, Virginia. Phase I Inspection Report.
Abstract
Hidden Valley Lake Dam is an earthfill embankment structure about 560 feet long and 32.3 feet high. The dam is classified as an intermediate size dam with a significant hazard classification. The principal spillway is a concrete drop-inlet riser, and the emergency spillway is an open channel in the right abutment. The dam is used for recreation. Based on criteria established by the Department of the Army, Office of the Chief of Engineers (OCE), the Spillway Design Flood (SDF) is the 1/2 PMF. The spillways will pass 39 percent of the PMF or 78 percent of the SDF without overtopping the dam. The SDF will overtop the dam by 1.1 feet, reach an average critical velocity of 4.8 feet per second (fps) and flow over the dam for 2.5 hours. Flows overtopping the dam during the SDF are not considered detrimental to the structure. The spillways are adjudged as inadequate, but not seriously inadequate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1981
- Accession Number
- ADA103722
Entities
People
- Boris O. Taran
Organizations
- Norfolk District, U.S. Army Corps of Engineers