A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
National Program for Inspection of Non-Federal Dams. Mountain Street Reservoir Dam (MA 00082), Mountain Street Reservoir Dikes (MA 01295), Connecticut River Basin, Williamsburg, Massachusetts. Phase I Inspection Report
Mountain Street Reservoir Dam is a 1,300-foot long earth fill dam built in 1905 and used for public water supply. The dam has a maximum height of 33 feet and consists of an embankment, spillway and gatehouse. The low-level outlet is a 24-inch diameter pipe controlled by a gate valve in the gatehouse. There are also two earth fill dikes located on the east side of the reservoir. Dike No. 1 is 160 feet long and 16 feet high. Dike No. 2 is 180 feet long and 8 feet high. Generally the dam is in fair condition. The following deficiencies were observed at the site: an inoperable low-level outlet; seepage along the downstream slope; erosion and animal burrows on the downstream slope; riprap missing from the upstream slope; cracked and spalled concrete on the gatehouse service bridge and spillway; a heavy growth of brush and trees on the lower downstream slope; and an accumulation of debris on the crest and discharge channel of the spillway. The test flood would overtop the dam by 0.1 feet. Hydraulic analyses indicate that the spillway with the stoplog can discharge 220 cfs, or 92 percent of the test flood outflow before the dam is overtopped. Without the stoplog, the test flood outflow is 240 cfs with the pond at E1 461.4. In this case, the spillway can discharge 300 cfs or 125 percent of the test flood outflow, and the dam would not be overtopped.
National Program for Inspection of Non-Federal Dams. Mountain Street Reservoir Dam (MA 00082), Mountain Street Reservoir Dikes (MA 01295), Connecticut River Basin, Williamsburg, Massachusetts. Phase I Inspection Report
Mountain Street Reservoir Dam is a 1,300-foot long earth fill dam built in 1905 and used for public water supply. The dam has a maximum height of 33 feet and consists of an embankment, spillway and gatehouse. The low-level outlet is a 24-inch diameter pipe controlled by a gate valve in the gatehouse. There are also two earth fill dikes located on the east side of the reservoir. Dike No. 1 is 160 feet long and 16 feet high. Dike No. 2 is 180 feet long and 8 feet high. Generally the dam is in fair condition. The following deficiencies were observed at the site: an inoperable low-level outlet; seepage along the downstream slope; erosion and animal burrows on the downstream slope; riprap missing from the upstream slope; cracked and spalled concrete on the gatehouse service bridge and spillway; a heavy growth of brush and trees on the lower downstream slope; and an accumulation of debris on the crest and discharge channel of the spillway. The test flood would overtop the dam by 0.1 feet. Hydraulic analyses indicate that the spillway with the stoplog can discharge 220 cfs, or 92 percent of the test flood outflow before the dam is overtopped. Without the stoplog, the test flood outflow is 240 cfs with the pond at E1 461.4. In this case, the spillway can discharge 300 cfs or 125 percent of the test flood outflow, and the dam would not be overtopped.
National Program for Inspection of Non-Federal Dams. Mountain Street Reservoir Dam (MA 00082), Mountain Street Reservoir Dikes (MA 01295), Connecticut River Basin, Williamsburg, Massachusetts. Phase I Inspection Report
1980
81 pages
Report
No indication
English