National Program for Inspection of Non-Federal Dams. Case Pond Upper Dam (CT 00560), Hockanum River Basin, Manchester, 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 : 64
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Book Description
Case Pond Upper Dam is a 110-year old earth embankment, used to impound water of the Birch Mountain Brook for recreational purposes. The dam is irregularly shaped in plan and section with an approximate length of 300 feet and a maximum height of 16 feet. The spillway is 87 feet long with a crest elevation about 2 feet below the top of the dam. The dam appears to be in poor condition. Many trees, with trunks up to 3 feet in diameter, are growing on both the upstream and downstream faces of the dam as well as on the crest. No erosion protection is provided on the upstream face. Seepage (about 2 gpm) was observed during the inspection about 10 feet downstream of the dam. No emergency low level outlet exists for drawing down the impoundment. The peak test flood inflow for Case Pond Upper Dam is 1,470 cfs. The routed test flood outflow of 1,460 cfs overtops the dam by 0.5 feet. The spillway is capable of discharging 810 cfs, or about 56 percent of the routed test flood outflow, prior to overtopping of the dam. A breach of the dam would result in a 3.1-foot depth (contained within the channel banks) of flow at the first residential area (an apartment complex), located about 4,400 feet downstream of the dam.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 64
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Book Description
Case Pond Upper Dam is a 110-year old earth embankment, used to impound water of the Birch Mountain Brook for recreational purposes. The dam is irregularly shaped in plan and section with an approximate length of 300 feet and a maximum height of 16 feet. The spillway is 87 feet long with a crest elevation about 2 feet below the top of the dam. The dam appears to be in poor condition. Many trees, with trunks up to 3 feet in diameter, are growing on both the upstream and downstream faces of the dam as well as on the crest. No erosion protection is provided on the upstream face. Seepage (about 2 gpm) was observed during the inspection about 10 feet downstream of the dam. No emergency low level outlet exists for drawing down the impoundment. The peak test flood inflow for Case Pond Upper Dam is 1,470 cfs. The routed test flood outflow of 1,460 cfs overtops the dam by 0.5 feet. The spillway is capable of discharging 810 cfs, or about 56 percent of the routed test flood outflow, prior to overtopping of the dam. A breach of the dam would result in a 3.1-foot depth (contained within the channel banks) of flow at the first residential area (an apartment complex), located about 4,400 feet downstream of the dam.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 78
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Porter Reservoir Dam is an earth embankment approximately 680 feet long with a maximum height of about 32 feet. The upstream slope of the embankment is approximately 2H:1V and is riprap-lined to within 3 feet of the top of the dam. The crest width of the dam is about 15 feet. The spillway consists of a concrete weir located about 75 feet downstream of the reservoir in a 20-foot wide stone-lined channel. The purpose of the dam, which is believed to have been constructed around 1902, is to impound a water supply for the City of Manchester water distribution system. Porter Reservoir Dam has a drainage area of approximately 0.6 square miles, with only about 0.15 square miles draining directly to the reservoir. The maximum storage capacity of the reservoir is 100 acre-feet. The peak inflow and outflow rates for the test flood at Porter Reservoir were computed to be 600 cfs and 570 cfs, respectively. The peak outflow corresponds to a stage of 4.2 feet above the spillway crest, or 1.8 feet below the top of dam elevation. The spillway is capable of discharging 970 cfs and can pass 100 percent of the test flood without overtopping of the embankment. The dam appears to be in fair condition. The upstream and downstream slopes of the embankment are overgrown with brush and trees and the crest of the dam is unprotected from erosion. The masonry of the appurtenant structures is in need of minor repairs at several locations and seepage was observed during the inspection at the outlet structure. Several of the gate valves associated with operations of the dam were inoperable at the time of the inspection.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 79
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Paper Mill Pond consists of a 17 foot long concrete spillway and a 15 foot long concrete dam, all completely surrounded by buildings of Amerbelle Corporation. At top of a dam elevation, the dam impounds 90 acre-feet. Outlet works consist of a drawdown conduit of unknown size and twin 8-inch line for process water. Under normal conditions, the entire flow of the Hockanum River discharges over the spillway. This dam has a maximum height of 16.7 feet with the top of dam 5.5 feet above the spillway crest. The dam is in fair condition with some seepage from the face of dam and some deteriorated concrete. In addition to the operable outlet works, there is the 48-inch metal penstock that was originally used to supply water to the generator turbine. This outlet is plugged and the pipe partially filled and collapsed.
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Category : Government reports announcements & index
Languages : en
Pages : 1316
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 87
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The Hockanum River Dam consists of a 28 foot long earth embankment with vertical stone masonry walls on the upstream and downstream faces. A concrete spillway 80 feet in the length extends from the earth embankment to the left abutment. The maximum height of the dam is 37 feet. Based on the visual inspection the Hockanum River Dam appears to be in fair condition. Several trees are growing on the crest and upstream face of the dam. Seepage was observed on the downstream face near the left end of the earth embankment section. There is a hole in the stone masonry about 7 ft. down from the crest of the dam. The visible portion of the spillway and training walls were in poor condition with the concrete having a rough surface due to erosion and spalling. The test flood would overtop the dam by 3.1 feet. The spillway is adequate to pass 38 percent of the test flood outflow without overtopping the dam.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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ISBN:
Category :
Languages : en
Pages : 78
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Upper Pond Dam is an earth embankment dam with a maximum height of 17 feet and a length of 390 feet. The dam embankment left of the spillway is approximately 10 feet in width, with 2 horizontal to 1 vertical upstream and downstream embankment slopes. The centrally located spillway is 72 feet in length and is a stone masonry structure. Stone masonry training walls approximately 5 feet in height are located at each side of the spillway. The outlet works consist of a concrete gate structure and an outlet channel. Based on the visual inspection, the Upper Pond Dam appears to be in poor condition. There was no movement or settlement of the crest observed. The horizontal alignment is good. The top of the outlet gate structure, however, is lower than the embankment crest. Some erosion was noted at the abutments, adjacent to the spillway section and adjacent to the outlet works. Trespassing on the slopes was not significant. Erosion scarps on the upstream slope extending 1-2 feet above waterline were noted. Several areas of broad shallow erosion on the upstream slope and upstream side of abutments were observed. Brush and many large trees (up to 2.5-ft.-dia.) with extensive root systems were noted on the slopes and crest of the dam. Standing water was observed in an area 35 feet downstream of the toe on the right side of the dam. The capacity of the spillway is inadequate to pass the 1/2 PMF test flood outflow of 5,195 CFS and would overtop the dam by about 0.9 feet. The spillway can pass about 33 percent of the test flood.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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ISBN:
Category :
Languages : en
Pages : 113
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Park Pond Dam, located at the eastern end of the pond, consists of an earth embankment with a maximum height of 20 feet and a top width which varies from 8 feet to 15 feet. The dam is 420 feet long and has a 19.9 foot concrete spillway at the left end. A diversion channel from an adjacent watershed connects to the spillway approach channel. The impoundment has a maximum storage capacity of 1,100 Acre-Feet. The dike, located at the northwestern end of the pond, consists of an earth embankment with a paved roadway along the crest. The dike has a maximum height of 7 feet, a top width of 21 feet, and a length of about 80 feet. Based on the visual inspection, the dam is judged to be in poor condition and the dike in fair condition. Features which could affect the future integrity of the dam are trees and brush on the embankment; seepage through the embankment; erosion of the downstream slope; deterioration of the spillway approach channel wall and the spillway weir; the accumulation of debris in the spillway and approach and discharge channels; the location of the low level control valve downstream of the dam and lack of erosion protection on the dike. The spillway capacity with water level at the top of the dam and the dike is 310 cfs or 58 percent of the Test Flood routed outflow. The Test Flood would overtop the dam and dike by 0.3 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 87
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The Pin Shop Pond Dam consists of an earth embankment with a 100 fokot long stone masonry overflow spillway located at the left end of the dam. Teh dam has a total length of 400 feet and a miximum height of 23 feet. The outlet works located to the left of the spillway consistk of an intake sluice gate which discharges into a stone masonry and concrete structure. A 16-inch gate valve drains the structure and discharges downstream of the spillway, A conduit to a downstream industrial complex is plugged with concrete. Based on the visual inspection, the dam is judged to be in poor condition. The future integrity of the dam can be affected by the lack of slope protection on the upstream slope, and continued erosion of the upstream and downstream slopes; trees on the embankment; continued undermining of the spillway apron; vegetation growing in open joints of the stone masonry training walls; the poor condition of the outlet works; and indagequate spillway capacity. The spillway has a capacity of 3,200 cfs and is capable of discharging 34 percent of the Test Flood outflow.
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Category : Science
Languages : en
Pages : 1194
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
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The Nystrom Pond Dam consists of a concrete, stone masonry and earth structure with a total length of 104 feet and a maximum height of 15 feet. The dam was originally constructed as a stone masonry wall with an upstream earth embankment. The concrete portion of the dam was constructed on and against the downstream face of the stone masonry wall in 1963. In 1969, the dam was raised approximately 2 feet and timber flashboards were replaced by a concrete wier. A downstream earth embankment is present against the left end of the dam. The outlet works located at the left end of the spillway consist of a 12-inch cast iron pipe through the dam controlled by an upstream gate. A 3 foot high earth and stone masonry dike is located approximately 500 feet south of the main dam on the west side of the pond. The main dam appears to be in fair condition and requires some work. The dike is in poor condition with very little freeboard or top width in some areas. The top of the dike is 2.5 feet lower than the crest of the dam. The spillway has a capacity of 60 cfs before overtopping the dike and 390 cfs at the crest of the dam.
