National Dam Inspection Program. Upper Kohanza Dam (CT 00062). Housatonic River Basin, Danbury, Connecticut. Phase I Inspection Report.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
Pagination or Media Count:
The dam is curved in plan and approximately 600 feet long, 31 feet high, and 18 feet wide at the crest. The upstream face is riprapped and has a 3H1V slope. The downstream face has a 2H1V slope and is protected by thick grass cover. At the left abutment of the dam is a 12-foot-wide uncontrolled spillway defined by two parallel masonry walls that extend the entire length of the 110-foot-long channel. Discharge from the spillway is channeled past the toe of the dam and returned to Kohanza Brook. At the toe of the dam, approximately 70 feet from the spillway, is a small gatehouse with a hand-operated control valve for operation of the 18-inch-diameter, cast iron, outlet conduit. This conduit passes through the dam and is the only outlet from the reservoir. Visual inspection of the dam and spillway indicated that the structure is in poor condition and in need of repairs and further study. The capacity of the spillway, with the water surface at the top of the dam, is 525 cfs or 219 percent of the routed test flood outflow. As a result, the dam will not be overtopped.
- Hydrology, Limnology and Potamology
- Civil Engineering