National Dam Inspection Program. Lower Alford Lake Dam (NDI Number PA 00053, PennDER Number-58-47), Susquehanna River Basin, Martins Creek, Susquehanna County, Pennsylvania. Phase I Inspection Report

摘要

The purpose of a Phase I Investigation is to identify expeditiously those dams which may pose hazards to human life or property. The assessment of the general condition of the dam is based upon available data and visual inspections. Lower Alford Dam is classified as a 'High' hazard - 'Small' size dam. The dam was found to be in good overall condition at the time of inspection. Hydraulic/hydrologic evaluations, performed in accordance with procedures established by the Baltimore District, Corps of Engineers, for Phase I Inspection Reports, revealed that the spillway will pass approximately 3.5% of the Probable Maximum Flood (PMF) before overtopping will occur. A spillway design flood (SDF) in the range of the 1/2 Probable Maximum Flood (1/2 PMF) to the PMF is required for Lower Alford Dam. The spillway is therefore considered 'Seriously Inadequate.' The owners should immediately initiate an engineering study to further evaluate the spillway capacity and to develop recommendations for remedial measures to reduce the overtopping potential of the dam. In summary, Lower Alford Dam is classified as being in an 'Unsafe' - 'Non-emergency' condition because of the results of the hydraulic/hydrologic evaluations.