National Dam Inspection Program. Laurel Hill Creek Dam, (NDS I.D. Number PA-00235, PennDer I.D. Number 56-85) Ohio River Basin, Laurel Hill Creek, Somerset County, Pennsylvania. Phase I Inspection Report,
Abstract
Based on the visual inspection, operational history, and available engineering data, the dam and its appurtenances are considered to be in good condition. The size classification for the facility is intermediate and the hazard classification is high. In accordance with the recommended guidelines, the Spillway Design Flood (SDF) for the facility is the Probable Maximum Flood (PMF). Results of the hydrologic and hydraulic analysis indicate that the facility is capable of passing and/or storing only 36 percent of the PMF. The analysis also indicates that spillway discharges are controlled by the downstream valley capacity when the flow over the weir exceeds approximately 3 feet (10 feet below the embankment) after which the pool level and tailwater will rise at roughly the same rate. Thus, failure from overtopping is essentially precluded and the spillway is considered inadequate, but not seriously inadequate. The consequences of embankment inundation by tailwater and subsequent rapid drawdown are uncertain; although, it is noted that portions of the downstream slope are designated as pervious fill and rock toe on the design drawings. This construction is favorable with respect to rapid drawdown response; however, thorough inspection of the embankment should be performed during and after inundation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1979
- Accession Number
- ADA079004
Entities
People
- Bernard M. Mihalcin
Organizations
- GAI Consultants, Inc.