National Program for Inspection of Non-Federal Dams. West Side Dam (CT 00484), Housatonic River Basin, Norfolk, Connecticut. Phase I Inspection Report PDF Download
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 134
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Book Description
The West Side Dam is a single purpose flood control dam. The dam consists of a compacted earth embankment on a previous foundation with a maximum height of 20 feet, a top width of 14 feet, and a crest length of 730 feet. The principal spillway is of the drop inlet type and discharges through a 36-inch concrete pipe through the center of the dam to an energy dissipator. A grass-covered 120 foot emergency spillway is excavated into the right abutment. Filter drains under the downstream embankment discharge through the side walls of the energy dissipator. The impoundment has a maximum storage capacity of 1,780 Acre-Feet. Based on the visual inspection, the dam is judged to be in good condition. Features that could affect the future integrity of the dam are the seepage and erosion of the right abutment and the emergency spillway. The spillway capacity of 3,000 cfs is equal to 106 percent of the routed Test Flood outflow and results in a freeboard of 0.1 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
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Book Description
The West Side Dam is a single purpose flood control dam. The dam consists of a compacted earth embankment on a previous foundation with a maximum height of 20 feet, a top width of 14 feet, and a crest length of 730 feet. The principal spillway is of the drop inlet type and discharges through a 36-inch concrete pipe through the center of the dam to an energy dissipator. A grass-covered 120 foot emergency spillway is excavated into the right abutment. Filter drains under the downstream embankment discharge through the side walls of the energy dissipator. The impoundment has a maximum storage capacity of 1,780 Acre-Feet. Based on the visual inspection, the dam is judged to be in good condition. Features that could affect the future integrity of the dam are the seepage and erosion of the right abutment and the emergency spillway. The spillway capacity of 3,000 cfs is equal to 106 percent of the routed Test Flood outflow and results in a freeboard of 0.1 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 151
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The Wood Creek Dam and Dike form a single purpose flood control impoundment. The dam consists of a 1000-ft. long zoned earth embankment and has a grass-covered 230 foot emergency spillway excavated into the left abutment. The principal spillway is of the drop inlet type and discharges through a 36-inch conduit through the center of the dam. The dam, constructed on a previous foundation, has a central impervious core, a chimney drain within the core and a foundation drain under the downstream portion of the embankment. The impoundment has a maximum capacity of 1,550 Acre-Feet. The condition of both the dam and dike is judged to be good. The impoundment has never been substantially filled so the behavior of the structures under full hydrostatic loading conditions is unknown. The future integrity of the dam could be affected by settlement around and under the outlet conduit, the lack of anti-seep collars on the outlet conduit within the impervious core, erosion along the left upstream toe and on the upstream slope of the dam, erosion and sloughing of the left abutment, and the lack of riprap at the downstream end of the dike between the emergency spillway and the dam. The spillway capacity with the water level at the top of the dam is 7,6000 cfs, 130 percent of the routed Test Flood outflow, resulting in a freeboard of 0.8 feet.
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Category : Government reports announcements & index
Languages : en
Pages : 1332
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ISBN:
Category : Science
Languages : en
Pages : 1016
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
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Category :
Languages : en
Pages : 67
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Parks Pond Dam is a cyclopean masonry/earth embankment that is approximately 180 feet long and 12 feet high. The earth embankment is on the downstream side and has a 2:1 slope. The upstream face is cyclopean masonry with a vertical face. The spillway is located on the southern half of the dam and consists of a 30.5 foot long weir. There is a lower gate house for the control of a discharge pipe that passes through the base of the dam. The size of the pipe is unknown. The valve for the operation of the discharge pipe is inoperable. The drainage area is 0.5 square miles and the reservoir has 100 acre-feet of available storage. The assessment of the dam is based on the visual inspection, past operational performance and hydraulic/hydrologic computations. The dam is judged to be in poor condition with several areas that require attention. These areas include seepage through the dam and around the spillway's west training wall, deteriorated concrete of the spillway and upstream face of the dam, vegetation on the embankments and along the toe of the dam and the nonoperating status of the blowoff. The dam is classified as small and has a significant hazard potential in accordance with guidelines established by the Corps of Engineers. The test flood for this dam is 1/2 the Probable Maximum Flood (PMF). The test flood inflow is 625 cfs and the routed test flood outflow is 473 cfs. The test flood outflow will overtop the dam by 0.55 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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ISBN:
Category :
Languages : en
Pages : 148
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The Norfolk Brook Dam and Dike form a single purpose flood control impoundment. The dam consists of a 440-ft. long zoned earth embankment with a grass-covered 80-foot emergency spillway excavated into natural ground between the dam and dike. The principal spillway is of the drop inlet type and discharges through a 30-inch conduit through the center of the dam. The dike consists of a zoned earth embankment of the same cross section as the dam. The dike has a maximum height of 28 feet and a length of 270 feet. As the impoundment is used for flood control, it remains empty except during periods of heavy runoff. The impoundment has a maximum storage capacity of 730 Acre-Feet. Based on the visual inspection and a review of all available pertinent data, the condition of the dam is judged to be fair. The impoundment has never been filled so the behavior of the structure under full hydrostatic loading conditions is unknown. The future integrity of the dam could be affected by a lack of good grass cover on the spillway and embankment slopes and riprap slope protection at the plunge pool for the outlet of the principal spillway. The spillway capacity with the water level at the top of the dam is about 1,870 cfs, 134 percent of the routed Test Flood outflow. The Test Flood would leave a freeboard of 0.6 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 66
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The West Lake Reservoir Dam is an earth embankment that is approximately 450 feet long and 31.7 feet high. The embankment has 1.5:1 side slopes and has a puddled clay and gravel core. The spillway is located through the northern abutment of the dam and consists of a 120-foot long concrete weir. There are upper and lower gate houses for the control of 30-inch water main and a 24-inch blowoff that passes through the base of the dam. The valves for the operation of the water main and the blowoff are in the lower gate house and are inoperable. The drainage area is 3.3 square miles and the reservoir has 3,430 acre-feet of available storage. The assessment of dam is based on the visual inspection, past operational performance and hydraulic/hydrologic computations. The dam is judged to be in fair condition with several areas that require attention. These areas include seepage through the dam and along the toe, steepness of the embankment, vegetation on the embankments, along the toe of the dam and in the spillway channel and the nonoperating status of the blowoff. The dam is classified as intermediate and has a high hazard potential in accordance with guidelines established by the Corps of Engineers. The test flood for this dam is 1/2 the Probable Maximum Flood (PMF). The test flood inflow is 6,520 cfs and the routed test flood outflow is 3,890 cfs. The test flood outflow will overtop the dam by 1.0 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 86
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The dam consists of an embankment at the south end of the pond and two dikes at the northeast end of the pond. The approximately 19.5 foot high dam on Hart Brook is an earth embankment approximately 325 feet in length including, at the left end of the dam, a 37 foot long rounded, broad-crested concrete spillway founded on rock. The two dikes along the northeast edge of the reservoir are referred to in this report as the North Dike and the South Dike. The dikes are about 8 feet and 15 feet high respectively, on the downstream side. The shape of the dikes is very irregular; the crest elevation is not constant, and is, on the average, four feet lower than the crest of the dam. Based upon the visual inspections, the dam appears to be in good condition while the dikes appear to be in poor condition. No evidence of instability was observed in the dam or dikes, however, the height of the dikes is inadequate; the dikes have an irregular configuration and excessively steep slopes; there is extensive tree and brush growth on the dikes and seepage through the dikes and dam. The spillway capacity to the point of overflow of the dikes is 120 cfs which is equivalent to 10% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 80
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The 36.1 foot high dam consists of an earth embankment with a concrete corewall and has a total length of 788 feet including a 28 foot long concrete spillway with permanent stop planks at the left end. The embankment has a top width of 13 feet with a 2 horizontal to 1 vertical upstream slope protected by hand placed riprap to within 2 feet of the top and a 2 horizontal to 1 vertical downstream slope with a 7 foot wide berm about 12 feet from the top. A concrete gate chamber and brick gatehouse are locate on the upstream side of the embankment. The gatehouse houses two hand wheel pedestal gate lifts controlling a 12 inch outlet and a 20 inch outlet from the gate chamber. Based upon the visual inspection at the site and past performances, the project is judged to be in fair condition. No evidence of instability of the project was observed. There are items which require attention, such as trees and brush on and at the toe of the embankment, seepage through the embankment, deterioration of the concrete spillway training wall and outlet headwall, the poor alignment of the spillway discharge channel and low-level outlet channel, and the unknown condition of the 12-inch outlet from the gate chamber. The spillway capacity with the reservoir level to the top of the dam is 980 cfs, which is equivalent to 48% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 81
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The dam is a concrete gravity structure with concrete buttresses adjacent to the downstream face of the dam spaced at approximately 18 feet on center. An earthen embankment slopes down from the exposed concrete section at a maximum inclination of 2 horizontal to 1 vertical on the downstream side of the dam. The structure is approximately 1080 feet long and has a maximum height of approximately 48 feet above the old streambed. Outlets consist of a 30 inch cast iron low level line at elevation 172, a 30 inch cast iron transmission main and an 8 inch cast iron service main. The spillway is a 137 foot wide nappe-shaped concrete weir with concrete sidewalls. The area downstream of the dam consists of residential and industrial developments, Connecticut Route 8, and further downstream, urban areas of Stratford. Based upon visual inspections at the site and past performance history, the dam appears to be in good condition. No evidence of structural instability was observed in the concrete section, buttresses or the earthen embankment. However, there are some areas which require attention. Based upon our hydraulic computations, the spillway capacity is 4300 cubic feet per second, which is in excess of 100 percent of the Test Flood. Peak inflow to the reservoir is 2600 cubic feet per second; peak outflow (Test Flood) is 1400 cubic feet per second with the dam maintaining a minimum freeboard of 1.8 feet. It is recommended that the left wingwall adjacent to the spillway be monitored to ascertain whether movement which has occurred to date is continuing.
