National Dam Inspection Program. Reynoldsville Storage Dam (NDI ID PA-01130, DER ID 33-5), Ohio River Basin, Pitchpine Run, Jefferson County, Pennsylvania. Phase I Inspection Report.
Abstract
Based on the evaluation of the existing conditions, the condition of Reynoldsville Storage Dam is considered to be unsafe/nonemergency due to seriously inadequate spillway capacity. The condition of the embankment is considered to be poor. The spillway structures were found to be significantly deteriorated. Extensive seepage on the order of 100 to 200 gallons per minute was observed seeping through the spillway structures. The abutment walls of the spillway were constructed about 2 feet below the mean dam crest elevation, posing a potential for erosion of the embankment and the abutment in the event of large flows through the spillway. The downstream face of the dam was found to be on a steep slope (approximately 1.5H to 1V) with swampy areas at the downstream toe level of the dam. The downstream end of the outlet pipe was found to be blocked by debris and siltation, indicating that it has not been functional for some time. In view of the above deficiencies and lack of any design information, it is considered advisable that the dam be evaluated in detail by a professional engineer to assess the structural integrity of the embankment and prepare and execute plans for the rehabilitation of the spillway structures and outlet facilities. According to the recommended criteria, small dams in the high hazard category are required to pass from 50 percent to full probable maximum flood (PMF). In view of the downstream damage potential the upper limit of the recommended range is considered to be applicable to this dam. The flood discharge capacity was evaluated according to the recommended criteria and was found to pass 20 percent of the PMF without overtopping the abutment walls of the spillway.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1980
- Accession Number
- ADA087889