Accession Number:

ADA109157

Title:

National Dam Inspection Program. Pond Number 4 Dam (NDI Number PA 00851, Penn DER Number 32-81), Ohio River Basin, Yellow Creek, Indiana County, Pennsylvania. Phase I Inspection Report

Descriptive Note:

Corporate Author:

ACKENHEIL AND ASSOCIATES GEO SYSTEMS INC PITTSBURGH PA

Personal Author(s):

Report Date:

1981-07-01

Pagination or Media Count:

65.0

Abstract:

Pond No. 4 Dam is classified as a small size, significant hazard dam, with a recommended 12 PMF Probable Maximum Flood spillway design flood. Based on the review and evaluation of available design information and visual observations of conditions as they existed on the dates of the field reconnaissances, the general condition of Pond No. 4 Dam is assessed poor. This evaluation is specifically based on a steep upstream embankment slope, sparse vegetation cover on the crest and upstream slope, and minor slope distress and tree and woody shrub growth on the downstream embankment. Seeps located along the downstream embankment toe also represent a potential hazard and warrant periodic observation by the dam owner. In addition, the unprotected spillway channel bottom and sideslopes may also present hazard to the dam during large spillway discharges. Analysis using the HEC-1 Dam Safety version computer program indicated the spillway channel section can pass the recommended 12 PMF spillway design flood without overtopping the embankment crest. Spillway discharge capacity is therefore considered adequate. Author

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE