National Program for Inspection of Non-Federal Dams. Prym Manufacturing Co. Dam (CT 00169), Thames River Basin, Killingly, Connecticut. Phase I Inspection Report.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
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Prym Manufacturing Co. Dam consists of nine earthfill dikes totaling about 2,000 ft. in length and of heights up to about 14 ft. These dikes form a continuous millrace canal between a diversion dam across Fivemile River and a mill building on the west bank of the river. A 37.3 ft. wide concrete wasteway with provision for stoplogs serves as the spillway. The only dewatering facility for this project is a gated check structure across the millrace. The maximum storage capacity of the pondage to top of the lowest dike is about 187 acre-ft. and the drainage area is about 0.45 sq. mi. 285 acres. The pondage is about 4,300 ft. long with area of abut 31 acres at spillway crest elevation. The dikes are judged to be in poor condition and the appurtenant works in fair condition. Seepage was noted at the downstream toes of all but the lower dikes. Both the crests fo the dikes and the upstream and downstream slopes are overgrown with brush and mature trees, with tree root systems being exposed on many areas. The test flood inflow equals 1,800 cfs. The routed test flood outflow 670 cfs would overtop Dike No. 2B by 0.7 ft. The maximum spillway capacity to top of Dike No. 2B, elevation 246 MSL, is about 300 cfs. The spillway is adequate to pass an outflow corresponding to about 64 percent of the routed test flood outflow.
- Hydrology, Limnology and Potamology
- Civil Engineering