National Program for Inspection of Non-Federal Dams. Whist Pond Dam (CT 00102), Naugatuck River Basin, Torrington - Goshen, 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 : 82
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Book Description
The Whist Pond Dam consists of an earth embankment with a maximum height of 9 feet, and a total length of 1,100 feet including a 17.7 foot long overflow spillway located at the right end of the dam. The outlet works consist of a 12-inch cast iron low level diversion outlet pipe through the dam, controlled by a downstream gate valve. The dam impounds Whist Pond, a storage reservoir for public water supply of the Torrington Water Company. Based on the visual inspection and a review of all available pertinent data, the dam is judged to be in fair condition. The future integrity of the dam can be affected by continued slumping of the rip-rap, roots through the embankment, continued deterioration of the spillway weir and training walls, the lack of a defined spillway discharge channel, and the downstream location of the low level diversion outlet valve. The calculated Test Flood inflow of 175 cfs results in a routed outflow of 65 cfs and 0.4 feet of freeboard. The spillway has a capacity of 100 cfs and is capable of discharging 154 percent of the Test Flood routed outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 82
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Book Description
The Whist Pond Dam consists of an earth embankment with a maximum height of 9 feet, and a total length of 1,100 feet including a 17.7 foot long overflow spillway located at the right end of the dam. The outlet works consist of a 12-inch cast iron low level diversion outlet pipe through the dam, controlled by a downstream gate valve. The dam impounds Whist Pond, a storage reservoir for public water supply of the Torrington Water Company. Based on the visual inspection and a review of all available pertinent data, the dam is judged to be in fair condition. The future integrity of the dam can be affected by continued slumping of the rip-rap, roots through the embankment, continued deterioration of the spillway weir and training walls, the lack of a defined spillway discharge channel, and the downstream location of the low level diversion outlet valve. The calculated Test Flood inflow of 175 cfs results in a routed outflow of 65 cfs and 0.4 feet of freeboard. The spillway has a capacity of 100 cfs and is capable of discharging 154 percent of the Test Flood routed outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 31
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The West Branch Dam consists of, from right to left, a 100 foot long earth embankment with an intake structure to a downstream canal, a 107 foot long concrete ogee section, and a 160 foot long earth embankment with a concrete core wall. The intake structure to the downstream canal contains two 42-inch sluice gates which discharge to the canal. The canal is separated from the river channel by an earth embankment which contains a 34 foot long auxilliary spillway. This spillway discharges into the river downstream of the dam. In the past, water from the canal would flow through a 36-inch reinforced concrete pipe (RCP) to a downstream manufacturing plant. The low level outlet, or blow-off, consists of a 48-inch RCP located to the left of the main spillway section and is controlled by a manually operated sluice gate. The dam has an overall length of 370 feet and a maximum height of 22 feet. The dam appears to be in fair condition and requires some work. The West Branch Dam has a tributary watershed of 33.3 square miles. The pond has a water surface area of 5.5 acres and a storage capacity with water level at the crest of the dam of 72 Acre-Feet. The main spillway has a capacity of about 8,200 cfs before overtopping the right portion of the dam.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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The Thurston Pond Dam, also known as the New Dam, consists of an earth embankment with a stone masonry overflow spillway located at the right end of the dam, and outlet works located at the right abutment. The total length of the dam, including the spillway section, is 510 feet and the maximum height is 20 feet. The stone masonry overflow spillway section has an upstream earth embankment of unknown section, a concrete cap and a batter of 6 inches per vertical foot on the downstream face. The outlet works consist of a concrete intake structure with inlet and outlet gates which can discharge water through a 24-inch concrete pipe to downstream locations or through an 18-inch concrete pipe into the stream below the dam. The dam impounds Thurston Pond, which is used for industrial water supply. Based on the visual inspection, the dam is judged to be in poor condition. Features that could affect the future integrity of the dam are continued erosion of the earth embankment, the presence of trees on the dam, the deterioration of the stone masonry overflow spillway, and inadequate spillway capacity to pass the Test Flood Outflow. The spillway capacity is 2,500 cfs or 37 percent of the Test Flood Outflow.
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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 : 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.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 111
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The Merriman Pond Dam consists of an earth embankment with a maximum height of 16 feet, a top width that varies from 30 to 80 feet, and an overall length of 500 feet, including a 12.5 foot long overflow spillway located approximately 150 feet from the right end of the dam. A paved road extends the entire length of the dam with a steel beam and concrete bridge crossing the spillway discharge channel. The outlet works consist of an 8-inch low level outlet or blowoff located to the left of the spillway and controlled by a downstream valve. The dam impounds Merriman Pond which is used as the water supply for turf irrigation of an adjacent golf course. Based on the visual inspection, the dam is judged to be in poor condition. Features that could affect the future integrity of the dam are continued erosion of the upstream and downstream slopes, seepage through the embankment, the presence of trees, stumps and brush on the downstream slope and deterioration of the spillway wing walls. The Test Flood inflow of 680 cfs results in a routed outflow of 345 cfs that overtops the dam by 0.1 feet. The spillway capacity with the water level at the top of the dam is 330 cfs and is equal to 96 percent of the Test Flood routed outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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ISBN:
Category :
Languages : en
Pages : 120
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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.
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.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 82
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The Black Rock Pond Dam consists of an earth embankment with the outlet works located near the left end of the dam. An overflow spillway is located at a small dike approximately 800 feet to the left of the dam on a separate arm of the pond. The dam has a top width of 10 feet, a maximum height of 20 feet, a total length of 160 feet, an upstream slope of 3 horizontal to 1 vertical, and a downstream slope of 1.6 horizontal to 1 vertical. The outlet works consist of a 12-inch cast iron low level outlet or blowoff pipe controlled by an upstream gate. The overflow spillway consists of a concrete channel 5 feet wide by 5 feet high with slots for flashboards at the upstream end. The dam impounds Black Rock Pond, which is used for swimming and fishing. Based on the visual inspection, the dam is judged to be in poor condition. Features that could affect the future integrity of the dam are the downstream seepage, erosion of the crest and slopes, the presence of tree stumps on the slopes, and inadequate spillway capacity. The test flood inflow of 1,200 cfs results in a test flood routed outflow of 1,000 cfs that would overtop the dam and dike by 1.6 feet.
