National Dam Inspection Program. Coal Dam (NDI Number PA 00464, PennDER Number 65-45), Tributary of Brush Creek, Westmoreland County, Pennsylvania. Phase I Inspection Report,
Abstract
Coal Dam is classified as a High hazard - Small size dam. The dam was found to be in fair overall condition at the time of inspection. Hydraulic/hydrologic evaluations, performed in accordance with procedures established by the Baltimore District, Corps of Engineers, for Phase I Inspection Reports, revealed that the spillway will pass approximately 23 percent of the Probable Maximum Flood (PMF) before overtopping will occur. A spillway design flood (SDF) in the range of the 1/2 Probable Maximum Flood (1/2 PMF) to the PMF is required for Coal Dam. Because of the relatively small size of the impoundment and drainage area the 1/2 PMF was chosen as the SDF. It was determined that during the 1/2 PMF the embankment would be overtopped by a maximum depth of 0.64 foot and a total duration of 4.00 hours. Because the estimated limiting criteria of one foot or greater depth of overtopping and a duration of 2 hours was not exceeded for this dam, it was concluded that a dam failure during the 1/2 PMF is unlikely to occur. Therefore, the spillway is considered inadequate but not seriously inadequate. It is recommended that the owner immediately initiate an engineering study to further evaluate the spillway capacity and develop recommendations for remedial measures to reduce the overtopping potential of the dam.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1980
- Accession Number
- ADA085232
Entities
People
- John A. Dziubek