National Program for Inspection of Non-Federal Dams. Woodtick Reservoir Dam (CT 00294), Housatonic River Basin, Wolcott, Connecticut. Phase I Inspection Report PDF Download
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 67
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Book Description
The Woodtick Reservation Dam is a cyclopean masonry concrete gravity structure that is 282 feet long and 55 feet high with a 100 foot wide spillway. It has an upper gate house with 20 inch and 30 inch blowoffs. The dam is classified as intermediate in size and has a high hazard potential based on downstream habitation. Based on the visual inspection, past operational performance and hydraulic computations, the dam is judged to be in fair condition. There are areas which should be studied in order to monitor the dam's behavior such as seepage through the body and foundation, spalling and fissuring of the concrete surfaces and the internal state of the dam's body. The drainage area contributing to the dam is 8.57 square miles. The routed test flood peak outflow (Probable Maximum Flood) is 12,670 cfs which would overtop the dam by 3.1 feet. The project will pass only 35 percent of the test flood outflow before overtopping the dam.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 67
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Book Description
The Woodtick Reservation Dam is a cyclopean masonry concrete gravity structure that is 282 feet long and 55 feet high with a 100 foot wide spillway. It has an upper gate house with 20 inch and 30 inch blowoffs. The dam is classified as intermediate in size and has a high hazard potential based on downstream habitation. Based on the visual inspection, past operational performance and hydraulic computations, the dam is judged to be in fair condition. There are areas which should be studied in order to monitor the dam's behavior such as seepage through the body and foundation, spalling and fissuring of the concrete surfaces and the internal state of the dam's body. The drainage area contributing to the dam is 8.57 square miles. The routed test flood peak outflow (Probable Maximum Flood) is 12,670 cfs which would overtop the dam by 3.1 feet. The project will pass only 35 percent of the test flood outflow before overtopping the dam.
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 : 97
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The Cornelis Dam is an earth embankment with concrete and masonry spillways. It is approximately 330 feet long, 15.3 feet high and has an average top width of 15 feet. The Cornelis Dam was probably constructed in 1917 with subsequent improvements in 1945. The dam is presently owned by the Scovill Manufacturing Company and is operated by the Century Brass Products, Inc. The pond is presently utilized for swimming. Based on visual inspection and past operational performance, the dam is judged to be in FAIR condition. Seepage and vegetation was noted on the downstream face of the west spillway and trees and brush are growing on the earth embankments. The test flood for this dam is 1/2 the Probable Maximum Flood (PMF). The test flood has an inflow equal to 6040 cfs and an outflow discharge equal to 6040 cfs with a stillwater elevation of 508.1 which will overtop the dam by 1.9 feet. The maximum outflow capacity of the spillways with the water surface at the top of dam is 2520 cfs, which is 42 percent of the test flood outflow.
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 : 92
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East Lake Reservoir Dam is an earthfill embankment about 550 ft. long with a maximum height of about 36 ft. The original dam has been raised and widened to accommodate a local road. The spillway is located at a natural saddle and draw about 300 ft. to the left of the left abutment of the dam. A 15 ft. span bridge constricts the spillway outlet channel. The main outlet is a 16 in. dia. pipe through the dam with a blowoff valve below the toe. A 12 in. dia. pipe connects the outlet pipe to Margerie Lake Reservoir. A second pipe outlet, 12. in. dia., is located near the left abutment. Marshy areas below the dam indicate probable leakage from the reservoir in the vicinities of the two outlet pipes. The serviceability of the outlet control and blowoff valves is doubtful. Both sides of the roadway across the dam are unstable and sloughing down. The dam is judged to be in fair condition. The spillway capacity is inadequate to pass the full PMF test flood outflow of 6,050 cfs; it would pass 50% of the test flood. The test flood would overtop the dam by about 1.7 ft. and the spillway discharge would be 1,750 cfs.
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.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 83
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The dam of the Middle Reservoir is a concrete and masonry structure. It is approximately 300 feet long, 27 feet high and has an average top width of 8 feet. Based on visual inspection and past operational performance, the dam is judged to be in FAIR condition. Seepage and vegetation was noted on the downstream face and the crest is chipped and spalled due to an unfinished rehabilitation project. The test flood for this dam is 1/2 the Probable Maximum Flood (PMF). The test flood has an inflow equal to 770 cfs and an outflow discharge equal to 765 cfs with a stillwater elevation of 269.4 which will overtop the dam by 1.0 feet. These values represent no flood storage in the upstream Beaver Lake. If use is made of the storage capacity of Beaver Lake, the flood inflow to the Middle Reservoir can be greatly reduced. The dam was not overtopped in the 1955 flood because Beaver Lake was low. The maximum outflow capacity of the spillways under a stillwater condition is 132 cfs, which is 17 percent of the test flood.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 94
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The New Naugatuck Reservoir Dam, built in 1914, consists of an earth fill embankment with a concrete corewall, a spillway and spillway channel with an earth fill embankment dike. The dam is 790 feet long including the spillway. The top of the dam (elevation 540.8) is 20 feet wide and is 80 feet above the streambed of Beacon Hill Brook. The corewall has a top elevation of 537.8 or 3 feet below the top of the dam. The spillway, located at the left end of the dam, is 40.5 feet long at the crest and consists of a concrete ogee weir and a stone paved discharge channel. The dike is 310 feet long, 10 feet high and 10 feet wide at the top. The outlets are a 16 inch upper level outlet at the left side of the dam near the toe of the dike and a 12 inch low-level outlet at the downstream toe of the dam. Based upon the visual inspection at the site and past performance, the dam is judged to be in good condition. No evidence of instability was observed in the dam or dike embankments. The condition of the spillway and outlet channels appear to be good. There are areas requiring attention and monitoring such as seepage along the downstream toe of the dam embankment. The spillway capacity with the reservoir level to the top of the dam is 2,130 cfs, which is 51% 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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Book Description
The project, built in 1910, consists of an earthfill dam and a separate earthfill dike with a spillway near its center. The spillway is a 22 foot long concrete sill with stop-planks and masonry training walls. The outlet works consist of a gatehouse with high and low level intakes to a 16 inch water supply main. The gate valve is operable. Based upon the visual inspection and its past performance, the project is judged to be in fair condition. No evidence was observed of instability in any component of the project. There is substantial seepage through the dam; the retaining wall at the toe of the dam and the spillway training walls are in a state of disrepair and there is much vegetation on the dike and in the spillway approach and discharge channels. With the stopplanks in place, the spillway capacity is 270 cfs, which is equivalent to 37% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 120
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Book Description
The dam is an earth embankment approximately 15 feet wide at the crest, 443 feet long and 35 above the streambed of West Branch, Naugatuck River. The spillway is a 193 foot long compound concrete weir. Three outlet pipes (30 inch diameter, 6 inch diameter and 16 inch diameter) run from the bottom of the outlet structure through the downstream training wall. The operating mechanisms for these outlets are in the gatehouse approximately on the centerline of the dam. Based upon the visual inspection and past performance of the dam, the dam is judged to be in fair condition. No evidence of instability was observed in any component of the dam. There is extensive spalling of the downstream face of the spillway; spalling of the top face of the upstream training wall; brush, tree growth and tree stumps on the slopes and crest of the embankment; and disrepair of the gatehouse and security fencing. Based upon the size (Intermediate) and hazard classification (High) of the dam in accordance with Corps of Engineers Guidelines, the test flood will be equivalent to the Probable Maximum Flood (PMF). Peak inflow to the reservoir is 20,400 cfs; peak outflow is 19,800 cfs with the dam overtopped by 0.5 feet. Based upon our hydraulics computations, the spillway capacity is 16,000 cubic feet per second (cfs), which is equivalent to 81% of the routed test flood outflow.
