National Program for Inspection of Non-Federal Dams. Norfolk Brook Dam (CT 00485), Housatonic River, Norfolk, Connecticut. Phase I Inspection Report.
Abstract
The Norfolk Brook Dam and Dike form a single purpose flood control impoundment. The dam consists of a 440-ft. long zoned earth embankment with a grass-covered 80-foot emergency spillway excavated into natural ground between the dam and dike. The principal spillway is of the drop inlet type and discharges through a 30-inch conduit through the center of the dam. The dike consists of a zoned earth embankment of the same cross section as the dam. The dike has a maximum height of 28 feet and a length of 270 feet. As the impoundment is used for flood control, it remains empty except during periods of heavy runoff. The impoundment has a maximum storage capacity of 730 Acre-Feet. Based on the visual inspection and a review of all available pertinent data, the condition of the dam is judged to be fair. The impoundment has never been filled so the behavior of the structure under full hydrostatic loading conditions is unknown. The future integrity of the dam could be affected by a lack of good grass cover on the spillway and embankment slopes and riprap slope protection at the plunge pool for the outlet of the principal spillway. The spillway capacity with the water level at the top of the dam is about 1,870 cfs, 134 percent of the routed Test Flood outflow. The Test Flood would leave a freeboard of 0.6 feet.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1981
- Accession Number
- ADA144566
Entities
Organizations
- New England District, U.S. Army Corps of Engineers