National Dam Safety Program. Powell Dam, (Inventory Number VA 08336), Roanoke River Basin, City of South Boston, Virginia. Phase I Inspection Report.
Abstract
The Powell dam is an earthen embankment about 400 feet long and 25.3 feet high. The dam is owned and maintained by Mr. Fred Powell. The dam is classified as a small dam with a high hazard classification (on the basis of location). The spillway is an earthen channel located at the left abutment. The reservoir is used to irrigate surrounding cropland. 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 emergency spillway will pass 37 percent of the PMF and 80 percent of the SDF without overtopping the lowest point on the dam crest. The SDF will overtop the lowest point on the dam crest by 0.2 feet with an average critical velocity of 2.1 feet per second and flow over the dam for 0.5 hours. Therefore, the spillway is adjudged as inadequate but not seriously inadequate. The visual inspection revealed no apparent problems or remedial measures in need of immediate attention. There is no formal regular maintenance operation program or warning system, and it is recommended that a formal maintenance program and warning system be established. The maintenance items listed should be accomplished as a part of the regular maintenance program within the next 12 months.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1980
- Accession Number
- ADA103504
Entities
Organizations
- Norfolk District, U.S. Army Corps of Engineers