National Program for Inspection of Non-Federal Dams. Eagleville Lake Dam (CT 00161), Thames River Basin, Coventry-Mansfield, 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 : 95
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Book Description
Eagleville Lake Dam is an earth embankment structure with a masonry spillway. The impoundment, Eagleville Lake, was formerly used for industrial power and process water but is now used for recreation only. The dam was constructed around 1860. Records indicate failure of the right embankment by overtopping from storms in 1938 and 1955. Reconstruction followed each failure. The dam is 22 feet in height and approximately 350 feet in length (including the spillway). The masonry spillway has a crest length of 170 feet. The outlet works is located at the left abutment of the spillway and is constructed of mortared stone masonry. A recently installed 42 inch square gate (1970) is the outlet works for the reservoir. Due to its age, Eagleville Lake Dam was neither designed nor constructed by present state-of-the-art procedures. Based upon the visual inspection at the site and the lack of engineering, operational and maintenance data, there are areas of concern which must be corrected to assure the long-term performance of this dam. The dam is considered to be in FAIR condition. Deficiencies include trees growing on the dam embankment, the potential for overtopping due to the limited discharge capacity of the overflow spillway, and erosion areas on the embankments. All these deficiencies can cause failure of the dam. The maximum spillway discharge of 11,300 CFS represents only 31 percent of the test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 95
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Book Description
Eagleville Lake Dam is an earth embankment structure with a masonry spillway. The impoundment, Eagleville Lake, was formerly used for industrial power and process water but is now used for recreation only. The dam was constructed around 1860. Records indicate failure of the right embankment by overtopping from storms in 1938 and 1955. Reconstruction followed each failure. The dam is 22 feet in height and approximately 350 feet in length (including the spillway). The masonry spillway has a crest length of 170 feet. The outlet works is located at the left abutment of the spillway and is constructed of mortared stone masonry. A recently installed 42 inch square gate (1970) is the outlet works for the reservoir. Due to its age, Eagleville Lake Dam was neither designed nor constructed by present state-of-the-art procedures. Based upon the visual inspection at the site and the lack of engineering, operational and maintenance data, there are areas of concern which must be corrected to assure the long-term performance of this dam. The dam is considered to be in FAIR condition. Deficiencies include trees growing on the dam embankment, the potential for overtopping due to the limited discharge capacity of the overflow spillway, and erosion areas on the embankments. All these deficiencies can cause failure of the dam. The maximum spillway discharge of 11,300 CFS represents only 31 percent of the test flood outflow.
Author:
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ISBN:
Category : Science
Languages : en
Pages : 1112
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 103
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Andover Lake Dam is an earth embankment dam with a concrete parapet wall along most of its crest. The dam is about 454 ft. long and 20 ft. high. To the right of the dam the reservoir rim has a saddle whose low point is 1.25 ft. below the level of the parapet. A 39 ft. wide concrete spillway with a 7 ft. wide stop-log notch is located about 50 ft. from the left abutment. A 24 in. dia. outlet pipe through the embankment is controlled by a gate valve, which at the time of the inspection was completely submerged. The dam is judged to be in generally fair condition. At the time of the inspection vegetative growth had invaded the embankment, there were cracks in the abutment walls of the spillway, and the spillway's discharge channel was encroaching on the toe of the dam embankment for a distance of about 150 ft. The discharge channel for the low level outlet was in need of repair and had an area of persistent seepage. The top of the embankment was lower than the top of the concrete parapet wall. There was some displacement of riprap on the upstream slope and areas of local erosion on the downstream slope. The spillway can pass about 280 cfs or about 9 percent of the routed test flood outflow without overtopping the low point near the right abutment.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 102
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The dam, substantially completed in 1957 and certificate of approval dated April 27, 1972, consists of an earth embankment with a concrete corewall and a concrete spillway. The embankment is 580 feet long, has a maximum storage capacity of 185 acre-feet, and is 22 feet in height above the streambed of Diamond Ledge Brook at the toe of the dam. The top of the dam (elevation 21.0) is 20 feet wide and 6 feet above the spillway crest. The upstream slope and top of the dam have a sod cover except at the left end where there is a sandy beach area. The spillway consists of a 10 foot long and 3 foot wide broad-crested concrete weir and a rectangular chute (fish ladder) which extends 65 feet to the toe of the dam. The low-level outlet facility is an 8 inch corrugated metal pipe which is encased in concrete and located to the left of the spillway and gated at the downstream slope. Based upon the visual inspection at the site and past performance of the dam, the project is judged to be in fair condition. There are items requiring maintenance and monitoring such as seepage along the toe of the dam, cracking along the joints of the spillway chute, and the lack of proper slope protection. Also, the fill being dumped along the downstream slope should be graded to a lesser slope and slope protection placed. The spillway capacity with the lake level to the top of the dam is 440 cfs, which is 81% of the routed test flood outflow.
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Category :
Languages : en
Pages : 1140
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 114
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Ellithorpe Dam consists of a 4,250 foot long earth embankment and a 200 foot wide grassed emergency spillway. The outlet consists of a concrete riser with 23 foot long weirs and a 48-inch reinforced concrete outlet pipe discharging to Middle River at the toe of dam. Based on the visual inspection, Ellithorpe Dam appears to be in good condition. There are several recreational vehicles paths on the slopes with some erosion taking place. Also, there are numerous rodent burrows on the upstream slope. Maintenance practices at Ellithorpe Dam appear to be good. Based on Corps of Engineers guidelines, the PMF was calculated to be 16,900 cfs inflow, with the outflow 10,800 cfs at an elevation of 591.6, which is 0.6 feet over the top of dam. This flow was used as the test flood.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
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Elmville Dam is a composite masonry and earth dam consisting of an unmortared stone overflow section and an earth fill right abutment dike, with an abandoned diversion canal and gate at the right end of the dike. The entire length of the dam is about 200 ft. The reservoir is about 800 ft. long and has a surface area at spillway level of about 1.8 acres. The drainage area above the dam is about 14 sq. mi. and the maximum storage to the top of dam is estimated at about 26 acre-ft. The dam is judged to be in generally fair condition. There is no low level outlet. There is considerable tree growth on the dike, which has no riprap protection on the upstream slope. The right training wall does not adequately retain the end of the dike and sloughing has occurred in this area. A sewer line has recently been constructed through the earth dike at midspan and it appears that no seepage cutoffs were installed along the sewer. The canal passing through the right abutment dike is obstructed with demolition debris and the gate at its entrance is not operative.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 66
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Lake Winnemaug Dam is an earth embankment approximately 500 feet long with a maximum height of about 15 feet. The upstream slope of the embankment is approximately 1H:1V and the downstream slope is about 1.5H:1V. The top of the dam is about 20 feet wide and it is a paved road. The overflow drop spillway is located about 100 feet from the right abutment and consists of an 18.5-foot long concrete weir, a cascading step section and a 4-foot high by 10-foot wide culvert through the embankment. The original purpose of the dam is unknown; however, the lake is currently used for recreation purposes. The peak test flood inflow for Lake Winnemaug Dam is 3,460 cfs. The routed test flood outflow of 2,010 cfs overtops the dam by about 0.8 feet. The spillway is capable of discharging 770 cfs or about 38 percent of the routed test flood outflow prior to overtopping of the dam. A breach of the dam would result in a 7.8-foot increase in the stream depth (3.8 feet above the channel banks) at the initial downstream damage area. The dam appears to be in poor condition. Numerous structural deficiencies, such as slope failures, seepage, and toe erosion were observed during the visual inspection. The embankment is overgrown with brush and trees and contains a number of rodent holes. The reservoir cannot be drained in an emergency because the outlet pipe control valve is inoperable.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 123
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Book Description
Upper Lake Phipps is impounded by Dam No. 1, an earth embankment dam with a stone masonry corewall, located at the eastern end of the Lake, and Dam No. 2, a stone masonry, concrete, and earth structure located near the southwest end of the Lake. A low causeway located on the north side of the Lake separates the Lake from a smaller pond. Dam NO. 1 has a top width of 10 feet, a maximum height of 29 feet, and a length of 345 feet. The dam consists of two sections separated by a bedrock knob located near the center of the dam. Dam No. 2 consists of a stone masonry and concrete buttress wall with an upstream earth embankment. The dam has a maximum height of 14 feet and an overall length of 190 feet, including a 20 foot long overflow spillway located at the right end of the dam. The spillway consists of a concrete cap on a stone masonry weir with 2.7 feet of freeboard from spillway crest to the top of Dam No. 2; Dam No. 1 is another 0.3 feet higher. Based on the visual inspection, the dams are judged to be in poor condition. Features that could affect the future integrity of the dams are seepage downstream of Dam No. 1 and through the masonry wall of Dam No. 2; brush and trees present on the crests and slopes of both dams; continued erosion and slumping of the upstream slope of both dams; deterioration and movement of the masonry portions of Dam No. 2; and the unknown condition or existence of a low level outlet or blowoff line. The Test Flood inflow of 390 cfs results in a routed outflow of 240 cfs and a freeboard from water surface to the top of Dam No. 2 of 0.4 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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The dam at Lower Ross Pond is approximately 600 ft. long, 6 feet high, and is an earth embankment with a downstream stone masonry-concrete capped face. The earth fill section varies in width from 3 to 10 feet along the upstream face and has varying slopes into the pool. The downstream face of the dam is vertical. There are two uncontrolled overflow spillways about 128 feet apart through the dam. The easterly spillway is a masonry and concrete capped weir 12.5 feet long. Short masonry training walls lead into the reservoir pool and channel overflows to the weir section. The downstream channel is Half Hill Brook which meanders through wooded terrain. The westerly spillway weir is 13 feet wide and also has training walls leading into the pond. The easterly spillway crest is approximately 2 feet below the westerly spillway crest. There is no outlet works for the dam. The spillway capacity is hydraulically inadequate to pass the 'test flood' (100-year) and this flow would overtop the by approximately 0.40 feet assuming the overflow length of the dam was equal to 100 feet. The inflow and routed outflow discharge value for this test flood are 296 CFS and 250 CFS, respectively. The maximum outflow capacity of the spillway without overtopping the dam is 142 CFS which is 57 percent of the routed test flood outflow.
