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National Program for Inspection of Non-Federal Dams. Globe Hollow Reservoir Dam (CT 00012), Connecticut River Basin, Manchester, Connecticut. Phase I Inspection Report.

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Globe Hollow Reservoir Dam is a zoned earth embankment about 620 ft. long, with a maximum height of about 40 ft. and a crest width of about 15 ft. It has a central masonry core wall. The spillway is located at the right abutment of the dam. It consists of a paved stone approach channel a 35 ft. wide concrete ogee crested weir with provisions for 14 in. high flashboards and concrete training walls extending 6 ft. above the spillway crest to the top of dam. The spillway outlets into a pond located at the toe and to the right of the dam, used as a Municipal recreational swimming pool. The gate tower and wet well shaft is located on the crest of the dam near its mid-span. It has two 24 in. dia. inlet and two 24 in. dia. outlet pipes all of which are controlled by 24 in. gate valves from the gate house. The inlet pipes are located at elevations 235 MSL and 250 MSL. One outlet pipe is used as a blowoff pipe for the reservoir. The other outlet pipe can either be used as a blowoff pipe or as a feeder to the water distribution system for the City of Manchester. The dam is judged to be in generally good condition. Minor seepage is evident at the downstream toe of the dam. There is some cracking of the concrete in the discharge channel, but overall the dam has few deficiencies. The routed test flood outflow of 5,875 cfs would overtop the dam by 1.4 ft. While the spillway is adequate to pass an outflow corresponding to about 36 percent of the routed test flood outflow without overtopping the dam the spillway chute walls would be overtopped.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

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