National Program for Inspection of Non-Federal Dams. Nepaug Dam (CT 00370), Farmington River Basin, New Hartford, Connecticut. Phelps Brook Dam (CT 00378), Farmington River Basin, Burlington, 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 : 127
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Book Description
The Nepaug Dam is a semi-arch gravity type dam with a spillway. It is 6500 feet long and 113 feet high. The Phelps Brook Dam is an earth dam with a concrete core wall. It is 1,250 feet and 67 feet respectively. Both of these dams are located at opposite ends of the Nepaug Reservoir. The Phelps Brook Dam has no overflow. The project will pass the Probable Maximum Flood (recommended Spillway Design Flood) without overtopping the dam. The general condition of both dams and appurtenant structures is good. Some recommended measures to be undertaken by the owner include monitoring movements of parapet walls at the upper gate house of the Phelps Brook Dam, monitoring seepage at both dams and vibrations at the Nepaug Dam during periods of heavy flow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 127
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Book Description
The Nepaug Dam is a semi-arch gravity type dam with a spillway. It is 6500 feet long and 113 feet high. The Phelps Brook Dam is an earth dam with a concrete core wall. It is 1,250 feet and 67 feet respectively. Both of these dams are located at opposite ends of the Nepaug Reservoir. The Phelps Brook Dam has no overflow. The project will pass the Probable Maximum Flood (recommended Spillway Design Flood) without overtopping the dam. The general condition of both dams and appurtenant structures is good. Some recommended measures to be undertaken by the owner include monitoring movements of parapet walls at the upper gate house of the Phelps Brook Dam, monitoring seepage at both dams and vibrations at the Nepaug Dam during periods of heavy flow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 98
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Book Description
The Richard's Corner Dam is an earth embankment with a concrete core and is 950 feet long and 75 feet high. It has an emergency spillway, channel, gate house and diversion tunnel. The dam and its appurtenant structures are generally in good condition. The dam will pass the Probable Maximum Flood (Recommended Spillway Design Flood) without overtopping the dam. Some recommended measures to be undertaken by the owner include establishment of metering points for seepage measurements and periodic inspections of the dam.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 132
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Book Description
This flood control project consists of a dam and dike which are earth embankments at 3H:1V with good grass cover and a top width of 12 feet. The dam is approximately 3060 feet long and 31 feet high. The dike is approximately 475 feet long and 28 feet high. The principal spillway consists of a reinforced concrete riser, a 30 inch RCP through the dam and a reinforces concrete impact basin. The emergency spillway is a 130 foot wide grassed earth channel at the eastern end of the dam. The reservoir is normally empty except for a small sediment pool. Based on the visual inspection, review of design information, and past operational performance, the dam and dike are judged to be in GOOD condition. There is some erosion due to vehicle trespass and animal burrows were noted in the embankments. The maximum outflow capacity of the spillways with the water level at the top of the dam is 3580 cfs, which is 185 percent of the test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 101
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Book Description
The Middle Pond Dam consists of an earth embankment and stone masonry structure with a maximum height of 10 feet a top width of 10 feet and a total length of 535 feet including overflow spillways of 21 feet and 29 feet located near the left end of the dam. A low earthen dike with a maximum height of about 3 feet, a top width of about 5 feet and a length of about 200 feet is located about 150 feet to the left of the dam. Based on the visual inspection, the dam is judged to be in very poor condition. Features that could affect the future integrity of the dam are continued erosion of the upstream slope and crest, trees and stumps on the slopes, seepage through the dam, decreased spillway capacity due to blocking off the right spillway, deterioration of the right spillway, and lack of an operable outlet works. With the right spillway blocked the total spillway capacity of 430 cfs is equal to 17 percent of the Test Flood outflow. With the right spillway restored, the total spillway capacity of 550 cfs would be equal to 22 percent of the Test Flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 82
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The Farmington Reservoir Dam is an earth embankment impounding an unnamed tributary to the Pequabuck River and is reported to have been built in 1895. The dam (including spillway) is 760 feet long and eight (8) feet wide at the top. The dam has a maximum impoundment capacity of 64 acre-feet and is about 8 feet in height from the toe of the downstream slope to the top of the dam. The spillway is a 32 foot long, and 2.8 foot high, concrete, ogee shaped weir. There is no information available on outlet pipes. Based upon the visual inspection at the site and past performance, the dam is judged to be in poor condition. There are areas requiring attention, monitoring, and maintenance such as seeps along the toe of the embankment, erosion on the upstream and downstream slopes, location and operation of outlet and inlet structures and valves, and removal of trees. Peak inflow to the impoundment at the test flood is 315 cfs; peak outflow is 250 cfs with the maximum stage in the reservoir at 383.7, or 1.0 foot below the top of the dam. Based on this information the dam is not expected to overtop at the test flood condition. The spillway capacity with the pool at top of dam is estimated to be 525 cfs which is greater than 100% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 111
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This facility is a 400 foot long concrete gravity dam across the Farmington River consisting of a 40 foot long right abutment housing three low level sluicee gates, a 300 foot long spillway, and a 60 foot long left abutment with a brick gatehouse housing six intermediate level sluice gates. The hydraulic height of the dam is approximately 33 feet. The six sluices in the left abutment discharge to a 640 foot long canal feeding a powerhouse at the end of the canal, which is not presently in use. The canal was excavated in the left riverbank and is lined with a concrete wall on the right side and a masonry wall on the left side. Based upon the visual inspection at the site, existing data, and past performance, the dam is judged to be in fair condition. No evidence of immediate structural instability of the dam or its appurtenances was observed, however, there is spalling of concrete on the abutments, canal walls, powerhouse bulkhead, and most probably on the crest and downstream face of the spillway and there is a seep at the juncture of the right abutment of the dam with the adjacent bedrock riverbank. The spillway capacity to the top of the dam is 33,000 cfs, which is equivalent to approximately 40% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 83
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The dam of the Upper Unionville Reservoir is an earth embankment with a concrete spillway. It is approximately 220 feet long, 23.8 feet high and has a maximum top width of 10 feet. The Unionville Reservoir Upper Dam was probably constructed in 1909. The Town of Avon presently owns and operates the dam and appurtenant structures. The dam is presently used for passive recreation and to fill the lower pond which is used for swimming. Based on the visual inspection and past operational performance, the dam is judged to be in FAIR condition. A wet area was noted at the downstream toe of the western embankment and there was erosion and/or settlement on the downstream face and top of the embankments. The cover of the intake tower is in fair condition and manhole steps in the intake tower are in poor condition. Access to the tower would be difficult during flood conditions. The test flood for this dam is 1/2 the Probable Maximum Flood (PMF). The test flood has an inflow equal to 1020 cfs and an outflow discharge equal to 1020 cfs with a stillwater elevation of 397.2 which will overtop the dam by 0.9 feet. The maximum outflow capacity of the spillway with the water surface at the top of the dam is 100 cfs, which is 10 percent of the test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 64
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Book Description
The Batterson Park Pond Dam is an earthfill embankment with stone masonry core that is 1,300 feet long and 30 feet high with a 35 foot wide spillway. It has two, 20 inch blowoffs as well as a line to an adjacent fire hydrant. The dam is classified as intermediate in size and has a high hazard potential based on downstream habitation. based on visual inspection, hydraulic computations and past operational performance, the dam is judged to be in poor condition. Areas of the dam should be studied in order to monitor its behavior such as the central downstream slope which is swampy and shows considerable seepage and the deteriorated spillway channel. The drainage area contributing to the dam is 4.68 square miles. The routed test flood peak outflow (Probable Maximum Flood) is 5,295 cfs which will overtop the dam by 1.21 feet. The project will pass only 29 percent of this peak outflow before overtopping the dam.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 90
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Book Description
Whigville Reservoir Dam is an earthen embankment structure with a concrete/boulder core wall. The dam is 460 feet long and has a maximum height of 54 feet. The 40 foot long concrete/boulder spillway is located at the right side of the dam. Slope paving forms the approach to the spillway. The downstream face is mortared stone masonry. Stone masonry training walls form the wasteway section. The outlet works consist of an upper and lower gatehouse each of which connect to submerged concrete intake structures. A 24 inch diameter blow off pipe passes under the wasteway channel to a stone masonry waste pot. The dam is judged to be in generally poor condition. The riprap on the upstream face is in generally good condition. The vertical and horizontal alignment is good. The downstream slope is covered with an extensive growth of trees and brush. Apparent seepage and wet areas were noted near the toe and at both sides of the spillway channel. The concrete parapet walls are in fair condition, with areas of erosion, spalling and deterioration noted. The concrete spillway weir is in poor condition with severely deteriorated concrete. The spillway is not adequate to pass the PMF spillway test flood outflow (7730 CFS) without overtopping the dam. The test flood would overtop the dam by about 4.2 feet. The spillway would pass about 20 percent of the test flood outflow without overtopping the dam.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 15
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Book Description
The Ensign Bickford Dam consists of a dry stone masonry wall with a maximum height of about 21 feet and an upstream earth embankment. The dam is about 60 feet long, including a 35 foot overflow spillway section in the center of the dam. The spillway has a concrete cap extending back about 10 feet from the crest. The right abutment is a ledge outcrop. An old mill building is located at the left abutment. The impoundment has a water surface area of less than 2 acres and an average depth of about 10 to 12 feet with the water level at the top of the dam. Thus maximum storage capacity is about 24 Acre-Feet. The dam height of 21 feet and storage capacity of 24 Acre-Feet are both below the requirements for a small dam. The dam, therefore does not qualify for the Corps inspection program.
