National Dam Inspection Program. Freethy Dam (NDI ID Number PA-00171, DER ID Number 64-160), Delaware River Basin, Carley Brook, Wayne County, Pennsylvania. Phase I Inspection Report,
GANNETT FLEMING CORDDRY AND CARPENTER INC HARRISBURG PA
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Based on the criteria established for these studies, Freethy Dam is judged to be unsafe, nonemergency, because the spillway capacity is seriously inadequate. The recommended Spillway Design Flood SDF for the size and hazard classification of the dam varies between 12 of the Probable Maximum Flood PMF and the PMF. Based on the size of the dam and reservoir, the 12 PMF is selected as the SDF. The existing spillway will pass only about 2 percent of the PMF before overtopping of the dam occurs. It is judged that the dam could not withstand the depth and duration of overtopping during storms of only 20 percent of the PMF. Failure of the dam would cause an increased hazard for loss of life downstream. Overall, the dam is judged to be in good condition.
- Hydrology, Limnology and Potamology
- Civil Engineering