National Dam Inspection Program. Orson Pond Dam (NDI Number PA-00136, PennDer Number 64-25) Susquehanna River Basin, Unnamed Tributary of East Branch of Lackawanna River. Wayne County, Pennsylvania. Phase I Inspection Report.
BAKER (MICHAEL) JR INC BEAVER PA
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Orson Pond Dam is classified as a Significant hazard - Small size dam. The dam was found to be in fair overall condition at the time of inspection. Hydraulichydrologic evaluations, performed in accordance with procedures established by the Baltimore District, Corps of Engineers, for Phase I Inspection Reports, revealed that the spillway will not pass the 100-year flood without overtopping the dam. A spillway design flood SDF in the range of the 100-year flood to the 12 Probable Maximum Flood 12 PMF is required for Orson Pond Dam. Because the dam is on the low end of the Small size category in terms of storage capacity and height, the 100-year flood was chosen as the SDF. During the 100-year flood, the dam is overtopped by a maximum depth of 1.79 feet for a total duration of 9.33 hours. The spillway is therefore considered inadequate. It is recommended that the owner immediately develop recommendations for remedial measures to reduce the overtopping potential of the dam. Several items of remedial work should be immediately initiated by the owner.
- Hydrology, Limnology and Potamology
- Civil Engineering