National Dam Inspection Program. Trout Run Dam Number 4. (NDI Number PA-00512, Pennder Number 49-5) Susquehanna River Basin, Trout Run, Northumberland County, Pennsylvania. Phase I Inspection Report.
Abstract
The visual inspection, operational history, and hydrologic/hydraulic analysis indicate that the facility is in good condition. Deficiencies noted by the inspection team included slumping and bulging of the rock surface on the steep downstream embankment slope, minor seepage along the downstream embankment toe and minor deterioration of the control tower. In addition, the growth of large trees in the immediate area of the downstream toe is a hindrance to expedient visual evaluation of the embankment. The size classification of the facility is small and its hazard classification is considered to be high. In accordance with the recommended guidelines, the Spillway Design Flood (SDF) for the facility ranges between the 1/2 PMF (Probable Maximum Flood) and the PMF. Due to the high potential for damage to downstream structures and possibly loss of life, the SDF is considered to be the PMF. Results of the hydrologic and hydraulic analysis indicate the facility will pass and/or store only 27 percent of the PMF prior to embankment overtopping. A breach analysis indicates that failure under less than 1/2 PMF conditions could lead to increased downstream damage and potential for loss of life. Thus, based on screening criteria provided in the recommended guidelines, the spillway is considered to be seriously inadequate and the facility unsafe, non-emergency.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1980
- Accession Number
- ADA082109
Entities
Organizations
- GAI Consultants, Inc.