Accession Number:

ADA063156

Title:

National Dam Inspection Program. Bear Gap Number 6 (Inventory Number NDS PA 817), Susquehanna River Basin, Northumberland and Columbia Counties, Commonwealth of Pennsylvania. Phase I Inspection Report.

Descriptive Note:

Corporate Author:

BERGER ASSOCIATES INC HARRISBURG PA

Personal Author(s):

Report Date:

1978-07-01

Pagination or Media Count:

49.0

Abstract:

The Bear Gap Dam no.6 is an earth fill dam with a rock core which is founded on rock in a cutoff trench. It was completed in 1915. Based on a visual inspection June 13, 1978, past performance and available engineering data, the dam and its appurtenances appear to be in fair condition. The following recommendations are made 1 The owner shall make a detailed hydrologic and hydraulic analysis for this dam and improve the spillway capacity to meet the requirements of this study and 2 The owner shall carefully monitor the seepage on the dam and take remedial action if seepage increases or if turbidity in the seepage water is discovered or if embankment sloughage would occur. In accordance with the Corps of Engineers evaluation guidelines, the spillway capacity is inadequate to pass the PMFProbable Maximum Flood without overtopping the dam. The spillway capacity is capable of passing only 34 of the PMF peak inflow and, therefore, it is considered to be seriously inadequate. A formal surveillance and downstream warning system shall be developed by the owner to be used during periods of high precipitation.

Descriptors:

• *SAFETY
• *DAMS
• HAZARDS
• MONITORING
• VISUAL INSPECTION
• FLOODS
• PENNSYLVANIA
• WARNING SYSTEMS
• SEEPAGE

Subject Categories:

• Civil Engineering
• Safety Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE