National Dam Inspection Program. Kehly Run Dam Number 5 (NDS ID Number PA-658 DER ID Number 54-7) Susquehanna River Basin, Kehly Run, Schuylkill County, Pennsylvania. Phase I Inspection Report

摘要

Kehly Run Dam No. 5 is an earthfill dam which is semi-circular in plan and convex in the downstream direction. The embankment is 1,050 feet long and 25 feet high. The crest width varies from 15 feet to 25 feet wide. The lower part of the downstream slope of the embankment consists of hand placed stone. The upper portion of the downstream slope consists of an earthfill. The reservoir drain conduit consists of one 6-inch cast iron pipe. The spillway is located on the left abutment and consists of a stonelined chute. The spillway is 39 feet long with 4H:1V sideslopes. The spillway discharge channel extends 625 feet downstream of the weir and bypasses Kehly Run Dam No. 4. The spillway and reservoir are capable of controlling approximately 75% of the PMF without overtopping the earth embankment. Based on criteria established by the Corps of Engineers, this spillway is termed inadequate. The long term affect of the seepage and wet areas on the abutments, and erosion of the slopes should be evaluated. Heavy growth of vegetation on the slopes should be selectively removed.