National Dam Inspection Program. Long Run Reservoir Number I Dam (NDI Number PA-00882, DER Number 13-004), Delaware River Basin, Carbon County, Pennsylvania. Phase I Inspection Report,
Abstract
Based on the visual inspection, past performance and the available engineering data, the dam and its appurtenant structures appear to be in fair condition. In accordance with the Corps of Engineers' evaluation guidelines, the size classification of this dam is small and the hazard classification is high. These classifications indicate that the Spillway Design Flood (SDF) should be in the range of one-half the Probable Maximum Flood (PMF) to the full PMF. The recommended SDF for this structure is one-half the PMF. The spillway capacity is adequate for passing 23 percent of the PMF peak inflow without overtopping the dam. Overtopping by the SDF is expected not to cause failure of the dam. The spillway, therefore, is considered to be inadequate, but not seriously inadequate. Some recommendations presented for immediate action by the owner are: (1) that measures shall be taken to provide an adequate spillway capacity, (2) that the cracked spillway slab be repaired, (3) that the downstream end of the spillway be protected from washouts during large discharges, (4) that the upstream gates be maintained and operated on a regular basis, and (5) that the downstream blow-off valves be maintained and operated on an annual basis.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1981
- Accession Number
- ADA097345
Entities
People
- Hendrik Jongsma