National Program for Inspection of Non-Federal Dams. Hopeville Pond Dam (CT 00438), Thames River Basin, Griswold, Connecticut. Phase I Inspection Program PDF Download
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 91
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Book Description
The dam at Hopeville Pond is approximately 493 feet long (including the overflow spillway) and is an earth embankment structure. The embankment is about 18 feet high with an average crest width of 10 feet. The overflow, concrete-stone masonry vertical fall spillway, is approximately 108 feet in length and located 187 feet from the right abutment. There are two outlet works structures. The dam is judged to be in FAIR condition with several deficiencies that require attention. The deficiencies include: lack of slope protection on the upstream slope, rotting tree stumps on the upstream and downstream slopes, trees growing on the downstream slope, and seepage at the downstream toe and left abutment. The maximum spillway discharge of 3985 CFS represents only 22.9 percent of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 91
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Book Description
The dam at Hopeville Pond is approximately 493 feet long (including the overflow spillway) and is an earth embankment structure. The embankment is about 18 feet high with an average crest width of 10 feet. The overflow, concrete-stone masonry vertical fall spillway, is approximately 108 feet in length and located 187 feet from the right abutment. There are two outlet works structures. The dam is judged to be in FAIR condition with several deficiencies that require attention. The deficiencies include: lack of slope protection on the upstream slope, rotting tree stumps on the upstream and downstream slopes, trees growing on the downstream slope, and seepage at the downstream toe and left abutment. The maximum spillway discharge of 3985 CFS represents only 22.9 percent of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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ISBN:
Category :
Languages : en
Pages : 127
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Pachaug Pond Dam is an earth embankment which has a maximum height of 17.0 ft. and is approximately 770.0 feet long. The dam is considered to be in fair to good condition. A spillway design test flood 24,800 cfs (equal to the PMF) will overtop the dam by approximately 4.0 feet.
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Category : Government reports announcements & index
Languages : en
Pages : 1152
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Category : Science
Languages : en
Pages : 1028
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
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Category :
Languages : en
Pages : 69
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The dam, built around 1920, has a total length of approximately 400 feet, consisting of a 184 foot long board-crested masonry spillway, a 190 foot long earth embankment, and a 27 foot long sluiceway. The top of the embankment, at elevation 88.7, is approximately 20 feet wide, 8.7 feet above the spillway crest, and 23 feet above the streambed of the Little River. With the pond level to the top of the dam, the pond impounds approximately 1000 acre-feet of water. The sluiceway at the left end of the dam leads to abandoned factory buildings about 400 feet from the dam. The intake to the sluiceway is a wood bulkhead, which contains 5 gates. Based upon the visual inspection at the site and past performance, the project is judged to be in poor condition. No evidence of instability of the project was observed. However, there are items which require maintenance, such as the dense vegetation on the embankment and the inoperable sluice gates. The spillway capacity with the pond level to the top of the dam is 13,000 cfs, which is equivalent to 108% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 83
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The dam, built in the 1870's, has a total length of approximately 425 feet and consists of an embankment section with upstream and downstream masonry faces and a masonry spillway section. The dam is 19.5 feet in height above the old streambed of Hunts Brook and, with the pond level to the top of the dam, impounds approximately 700 acre-feet of water. The spillway is an 87.8 foot long broad-crested weir located at the right end of the dam and is founded on bedrock. Based upon the visual inspection at the site and past performance, the project is judged to be in poor condition. There are areas which require monitoring and/or maintenance such as: seepage at several locations on the downstream face and toe of the dam, seepage of the low-level outlet culvert, the inoperable low-level outlet gate, eroded areas on the top of the dam, deteriorated masonry at several locations on the dam, and possible erosion or undermining due to high velocity flows along the downstream toe of the spillway and dam. Peak inflow to the reservoir at the 1/2 PMF is 8,610 cubic feet per second; peak outflow is 7,730 cfe with the dam overtopped by 2.7 feet. The spillway capacity with the reservoir level to the top of the dam is 1,610 cfs, which is equivalent to 21% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 87
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The Sterling Pond Dam, built on 1870 to impound water for industrial use, is a masonry structure with earth fill along the upstream slope. The dam is approximately 1010 feet in length, 12.5 feet in height and impounds approximately 125 acre-feet of water on the Mossup River. There are three stone masonry spillways; one at each end and one at the central portion of the dam. The spillway at the left end is 65 feet long, the central spillway is 70 feet along and the right spillway is 52 feet long. 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 repair, maintenance and monitoring such as deterioration of the masonry at the spillways, erosion at the top and upstream slope of the earth fill embankment, lack of riprap protection on the upstream slope and minor seepage. The total capacity of all three spillways with the lake level to the top of the dam is 2940 cfs, which is 10% of routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 103
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The Packers Pond Dam, built about 1880 to provide water for industrial use, is an earth embankment impounding 450 acre-feet of water on Mill Brook. The length of the dam, including the spillway, is 325 feet. The top of the dam averages between 12-15 feet in width and is approximately 18 feet above the old streambed at the spillway discharge channel. The spillway, located at the right end of the dam, is a 64 foot long, broad-crested, stone masonry structure which provides 4.4 feet of freeboard from the crest to the top of the dam. The outlet is a concrete intake and gate structure located on the upstream slope at the left end of the dam. The gate is not functional and the size of the outlet could not be exactly determined. However, the outlet is assumed to be approximately 3 feet wide by 2.5 high. A railroad embankment runs along the downstream toe of the dam. This embankment is about 24 feet in height, with the top of the embankment approximately 12 feet higher than the top of the dam. The spillway capacity with the pond level at the top of the dam is 1700 cfs, which is 28% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 76
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The dam at Riverside Pond is a stone-faced earth embankment dam and is used to supply process water to the adjacent factory located just downstream of the dam. the dam has a height of 21 feet and is approximately 180 feet in length (including the spillway). A single span two lane bridge spans the spillway crest. The spillway is a stone masonry/concrete cap, uncontrolled broad crested weir, 64 feet in length. There are two outlet works, one located to the right of the spillway and the other at the left of the spillway. the right outlet works is a gated underground sluiceway that supplies process water to the adjacent mill. Flows at this outlet pass through the mill and discharge through the side wall of the building foundation and return to Furnace Brook. The left outlet works is also gated and is a 42 inch diameter riveted steel plate pipe through the left dam embankment. Based on the visual inspection at the site, the dam is considered to be in POOR condition. Deficiencies observed include: cracks and voids in the upstream masonry face vegetation growing in the upstream and downstream masonry walls, cracks and bulging of the downstream face of the dam, leakage through the left intake gates and deterioration of the outlet pipe, and seepage along the downstream face. Assuming the pool elevation at the top of the dam, the spillway can pass a flow of 4,435 CFS, which represents only 69 percent of the test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 97
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Fitchville Pond Dam is a stone masonry and concrete gravity dam constructed about 1871 and is used solely for recreation. The dam has a height of 27 feet and is approximately 200 feet in length. The spillway is an uncontrolled ogee overflow structure which comprises the right two thirds of the dam. The outlet works for the dam consists of three manually operated sluice gates which discharge flows into a waste way at the left abutment of the dam. Due to its age, Fitchville Pond 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. The dam is classified as SMALL in size and a SIGNIFICANT hazard structure in accordance with the recommended guidelines established by the Corps of Engineers.
