National Dam Safety Program. Daley Dam (Inventory Number VA 10709), Potomac River Basin, Loudoun County, Virginia. Phase I Inspection Report.
ARMY ENGINEER DISTRICT NORFOLK VA
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The Dam is an earthfill structure about 800 feet long and 29.4 feet high. The dam is classified as a small dam with a significant hazard classification. The principal spillway is a drop-inlet located in the reservoir discharges into a stilling basin below the dam. The emergency spillway is an open channel cut in the right abutment. The spillway will pass 25 percent of the PMF or 100 percent of the SDF without overtopping the crest of the dam. The spillway are adjusted as adequate. The visual inspection revealed an upstream slope failure. Therefore, the dam is assessed as unsafe, non-emergency. The unsafe, non-emergency classification applied to a dam with a structural deficiency is means that based on an initial screening and preliminary calculations, there appears to be a serious deficiency in the stability of the upstream slope. It is recommended that within 2 months from the date of notification the owners engage the services of a qualified geotechnical engineering firm to perform a stability analysis on the dam and recommend methods of eliminating the danger imposed by the project. In the interim, a detailed emergency operations plan and warning system, should be promptly developed.
- Hydrology, Limnology and Potamology
- Civil Engineering