National Program for Inspection of Non-Federal Dams Mulberry Reservoir Dam (CT 00130), Naugatuck River Basin, Naugatuck, New Haven, County, Connecticut. Phase I Inspection Report.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
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The Mulberry Reservoir Dam consists of an earth embankment, constructed of impervious materials with a pervious zone and toe drain on the downstream side. The dam is 580 feet in length with a top width of 20 feet, a maximum height of 66 feet, and upstream and downstream slopes of 2 horizontal to 1 vertical. A 40 feet long concrete spillway with discharge chute and stilling basin is located near the right end of the dam. The outlet works located near the center of the dam consist of a 12-inch cast iron blowoff and a 12-inch cast iron supply main through the dam, both controlled by manually operated gates located in an upstream gatehouse. Based upon the visual inspection and a review of all available pertinent data, the dam is considered to be in good condition. The wet area downstream of the dam the seepage into the stilling basin through joints in the bottom slab and training wall and the vertical displacement of a portion of the bottom slab in the stilling basin require further investigation or attention. Hydraulic analyses indicate that the capacity of the existing spillway is 1600 cfs with the reservoir at elevation 574.78 Top of Dam. The test flood inflow is 540 cfs and the routed outflow is 400 cfs, which is equivalent to a flow of water 2 feet deep over the spillway. The calculations show the spillway is capable of passing 400 of the PMF without overtopping the dam.
- Hydrology, Limnology and Potamology
- Civil Engineering