Accession Number:

ADA142708

Title:

Housatonic River Basin, Danbury, Connecticut. Lower Kohanza Dam (CT 00064). National Dam Inspection Program. Phase I Inspection Report.

Descriptive Note:

Corporate Author:

CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV

Personal Author(s):

Report Date:

1981-05-01

Pagination or Media Count:

103.0

Abstract:

The original Lower Kohanza Dam was constructed about 1860 for the Town of Danbury to provide a public water supply. The existing structure is a 336-foot-long and 27-foot-high earthfill dam. The upstream slope is inclined at approximately 3H1V and is protected with riprap except for a 12-foot-wide strip near the crest of the dam. The downstream face of the dam has a 2H1V slope and is completely covered with tall grasses, thicket and brush. The spillway is separated from the dam by a rocky knoll at the right abutment of the dam. The spillway is a masonry structure and has a crest length of 14 feet E1. 571 NGVD and is shaped on the right bank by a natural rock outcrop and on the left by an earth masonry dike extending from the adjacent knoll. The visual inspection of the dam indicated that the structure is in poor condition. Several seepage points and wet areas were observed at the toe of the dam, and the spillway and the adjacent dike were in a state of disrepair. The capacity of the spillway, with the water surface at the top of the dam, is 300 cfs or 38 percent of the routed test flood outflow.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE