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National Dam Inspection Program. Mill Dam (NDI Number PA-00711, DER Number 6-295), Delaware River Basin, Commonwealth of Pennsylvania, Berks County, Pennsylvania. Phase I Inspection Report,

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Based on the visual inspection, past performance and the available engineering data, the dam and its appurtenant structures appear to be in good 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 the full PMF. The spillway capacity is adequate for passing 34 of the PMF peak inflow without overtopping the dam. Overtopping of the dam by the PMF will not cause failure. The spillway, therefore is considered to be inadequate, but not seriously inadequate. The following recommendations are presented for immediate action by the owner 1 That the valve on the outlet pipe be maintained and operated at least once a year 2 That a formal surveillance and downstream warning system be developed for use during periods of high or prolonged rainfall 3 That provision be made to cut or remove the screen over the spillway in case of an emergency and 4 That an operation and maintenance manual be prepared for guidance in the operation of the dam during normal and emergency conditions, and that a schedule be developed for the annual inspection of the dam and its appurtenant structures.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

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