National Dam Inspection Report. Lebanon Reservoir Dam Number 1. NDI I.D. Number PA-00595, PennDER I.D. Number 38-1. Susquehanna River Basin, West Branch of Hammer Creek, Lebanon County, Pennsylvania. Phase I Inspection Report,
Abstract
The visual inspection, operational history, and hydrologic/hydraulic analysis indicate that the facility is in fair condition. Deficiencies noted by the inspection team included heavy overgrowth across the embankment crest and slopes, rodent burrows along the downstream embankment face, a deteriorated emergency spillway, and minor seepage beneath the emergency spillway and around the outlet conduit. These deficiencies are, for the most part, attributable to a general lack of adequate maintenance since the facility was phased out of operation in 1973. The size classification of the facility is small and its hazrad 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 (Probably Maximum Flood) and the PMF. Due to the high potential for damage to downstream structures and 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 16 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
- Mar 01, 1980
- Accession Number
- ADA085227
Entities
People
- Bernard M. Mihalcin
Organizations
- GAI Consultants, Inc.