National Dam Inspection Program. Mounty Airy Dam. NDS ID PA-00811 DER ID 45-243. Delaware River Basin. Forest Hills Run, Monroe Count, Pennsylvania. Phase I Inspection Report.
Abstract
Mount Airy Dam is a 42 foot high zoned earth embankment, 700 feet long and impounds a 15.5 acre reservoir. The structure was built downstream of an existing dam which was razed after Mount Airy Dam was about to be filled. The dam contains a central impervious core which was compacted to at least 95 percent of the modified proctor density. The impervious core, constructed to the same elevation as the spillway crest, has a reported top width of 10 feet and 1H:1V slopes. Under the dam centerline is an eight foot wide, five foot deep core trench excavated into competent materials as determined by the resident engineer. The dam shell is a semi-impervious fill which was also compacted to at least 95 percent of the modified proctor density. The dam crest had a measured width of 10.5 feet and a design upstream slope of 2.5H:1V. The upstream slope is protected with 18 inches of riprap over a six-inch gravel bedding from the crest to 12.5 feet below the spillway crest elevation. The design downstream slope is 2H:1V and is covered with grass. The embankment also contains a gravel toe drain with eight-inch corrugated metal pipes which outlet in the 36-inch pipe.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1979
- Accession Number
- ADA072899