National Dam Inspection Program. Labelle Slurry Pond 3 (NDI Number PA 00295, Penn DER Number 26-105), Ohio River Basin, Tributary to Monongahela River, Fayette County, Pennsylvania. Phase I Inspection Report
ACKENHEIL AND ASSOCIATES GEO SYSTEMS INC PITTSBURGH PA
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Based on a review of available information, visual observations of conditions as they existed on the date of the field inspections, and supporting engineering calculations, the general condition of LaBelle Slurry Pond 3 is considered to be fair. This assessment is based primarily on visual observations of embankment and spillway conditions and hydrologyhydraulic analyses of reservoirspillway capacity. The structure is classified as a large size, significant hazard dam. Corps of Engineers guidelines recommend the Probable Maximum Flood PMF as the Spillway Design Flood for a large size, significant hazard dam. LaBelle Slurry Pond 3s Spillway Design Flood is the Probable Maximum Flood. Spillway capacity is inadequate because the non- overtopping flood discharge was found, by using the HEC-1 computer program, to be 79 percent of the PMF. The Phase I investigation of LaBelle Slurry Pond 3 revealed deficiencies and conditions which should be corrected or improved through implementation of the following recommended improvement efforts. Recommendations are 1 Embankment Improvements 2 Principal Spillway The owner should immediately clean the principal Spillway trash cage of debris and improve the inflow channel to permit unrestricted flow from the reservoir to the pipe 3 Emergency Spillway The emergency spillway should either be improved or eliminated 4 Emergency Operation and Warning Plan 5 Monitoring of Seepage Zones and 6 Maintenance and Inspection Procedures.
- Hydrology, Limnology and Potamology
- Civil Engineering