National Program for Inspection of Non-Federal Dams. Portland Reservoir Dam (CT 00149), Connecticut River Basin, Portland, 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 : 104
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Book Description
Portland Reservoir Dam is an earthfill dam with an impervious cores, about 400 ft. long, with a maximum height of about 28 ft. A 450 ft. long earthfill embankment serves as right abutment closure dike. The spillway is a 94 ft. long ungated overflow ogee crest located about 300 ft from the left abutment. A wet well and gate house just to the right of the spillway on the crest of the earth embankment houses the control valves for the inlet and outlet pipes. The test flood inflow equals 9,350 cfs. The routed test flow outflow (8,450 cfs) overtops the dam by about 2.3 ft. The spillway is adequate to pass about 25 percent of the routed test flood outflow with overtopping the dam. The dam appears to be in good condition, but there is extensive erosion along the upstream face of the right abutment dike. Brush growth has begun to intrude on the upstream face of the dike. Along the crest of the dam to the left of the spillway there are several mature trees.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 104
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Book Description
Portland Reservoir Dam is an earthfill dam with an impervious cores, about 400 ft. long, with a maximum height of about 28 ft. A 450 ft. long earthfill embankment serves as right abutment closure dike. The spillway is a 94 ft. long ungated overflow ogee crest located about 300 ft from the left abutment. A wet well and gate house just to the right of the spillway on the crest of the earth embankment houses the control valves for the inlet and outlet pipes. The test flood inflow equals 9,350 cfs. The routed test flow outflow (8,450 cfs) overtops the dam by about 2.3 ft. The spillway is adequate to pass about 25 percent of the routed test flood outflow with overtopping the dam. The dam appears to be in good condition, but there is extensive erosion along the upstream face of the right abutment dike. Brush growth has begun to intrude on the upstream face of the dike. Along the crest of the dam to the left of the spillway there are several mature trees.
Author: United States. Army. Corps of Engineers. New England Division
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ISBN:
Category : Dams
Languages : en
Pages : 234
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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:
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Category :
Languages : en
Pages : 84
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Hallmere Reservoir Dam is an earthfill embankment about 570 ft. long and 45 ft. high. It has a concrete core and a riprap covered upstream face. It was constructed in 1896-97 for purposes of water supply. A 30 ft. wide masonry waste-way with s ill and flashboards serves as the spillway. The only regulated outlet is a 20 in. dia. concrete pipe. The maximum storage capacity of the reservoir to top of dam is about 585 acre ft. and the drainage area is about 1 sq. mi. The dam appears to be in fair condition. Brush and tree growth has begun to intrude on the slopes and crest of the embankment. Seepage was noted at the downstream toe of the dam. Animal burrows and missing riprap was apparent on the upstream slope of the embankment. The test flood inflow is 3200 cfs. The routed test flood outflow (2,900 cfs) overtops the dam by 0.7 ft. The spillway is adequate to pass an outflow corresponding to about 51 percent of the routed test flood outflow but the spillway and discharge channel walls would be overtopped by about 5 ft.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 132
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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:
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Category : Government reports announcements & index
Languages : en
Pages : 1152
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 95
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The dam is a concrete arch with thrust walls and a concrete crib with earth backfill. The dam is about 200 ft. long with a maximum height of 28 ft. The dam is small in size with a high hazard potential. The dam is in poor condition at the present time. There are various remedial measure and recommendations which must be undertaken by the owner.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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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:
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ISBN:
Category :
Languages : en
Pages : 20
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
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The dam is located on a tributary of the Connecticut River on the town line of Bolton and Vernon, Tolland County, Connecticut. It is an earthfill structure approximately 625 ft. long with a maximum depth at its center of 26 ft. The crest width varies from 12 to 15 feet. A vertical granite masonry wall extends from the downstream side of the crest to the bed of Lydall Brook below. The visable part of the upstream embankment has a 1 on 2 to 1 on 3 slope with a riprap face. The downstream embankment consists of cobbles and boulders piled against the face of the masonry wall on an approximate 1 on 1.5 slope. The dam is in generally good condition. It appears to be structurally stable at the present time under normal conditions. Based on its small size and high hazard classification in accordance with the Corps' guidelines, the test flood is 1/2 the PMF. The spillway will pass only about 44 percent of the test flood and is considered inadequate. Recommendations to improve dam safety are: (1) Increase spillway capacity; (2) Replace 6-in. discharge pipe and relocate valve; (3) Add riprap near the center on the downstream side; (4) Divert spillway discharge away from the toe of the dam.
