National Program for Inspection of Non-Federal Dams. Porter Reservoir Dam (CT 00014), 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 : 78
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Book Description
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.
Publisher:
ISBN:
Category :
Languages : en
Pages : 78
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Book Description
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.
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Category : Research
Languages : en
Pages : 1138
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Book Description
Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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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 : 64
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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.
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Category : Science
Languages : en
Pages : 540
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Category : Government reports announcements & index
Languages : en
Pages : 1092
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 75
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The maximum height of the dam is 27 feet at the left edge of the spillway. The reservoir storage at the top of dam is 11 acre-feet. There are both upstream and downstream spillway training walls composed of mortared and hand placed cobbles respectively. The visual inspection of Risdon Pond Dam indicated that the dam is in fair condition. The inspection revealed that the unprotected upstream face has been slightly eroded by wave action. The downstream face of the dam has a number of blocks which have been displaced, cracked or have unmortared joints, Grass, moss and small trees are growing out of some of the joints. There are several areas of seepage along the downstream wall both sides of the spillway. There is a 3-foot deep depression on the left downstream wall of the dam. Also, there are five large tree stumps along the crest of the dam and a footpath traverses the crest. The spillway will discharge 220 cfs, or 16% of the test flood with the pool level at the top of the dam. The test flood flow of 1420 cfs will overtop the dam by 2.0 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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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: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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ISBN:
Category :
Languages : en
Pages : 84
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Rice Reservoir Dam has a hydraulic height of 48 ft., is 12 ft. wide, and is 980 ft. kong, It is earthen embankment dam, having a reinforced concrete core and a small chute-type spillway. The dam is in fair condition. It is intermediate in size with a significant hazard potential. Keywords include: Visual inspection, Dam safety, Connecticut River Basin, Claremont, New Hampshire, and Stevens Brook.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 83
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The dam of the Upper Unionville Reservoir is an earth embankment with a concrete spillway. It is approximately 220 feet long, 23.8 feet high and has a maximum top width of 10 feet. The Unionville Reservoir Upper Dam was probably constructed in 1909. The Town of Avon presently owns and operates the dam and appurtenant structures. The dam is presently used for passive recreation and to fill the lower pond which is used for swimming. Based on the visual inspection and past operational performance, the dam is judged to be in FAIR condition. A wet area was noted at the downstream toe of the western embankment and there was erosion and/or settlement on the downstream face and top of the embankments. The cover of the intake tower is in fair condition and manhole steps in the intake tower are in poor condition. Access to the tower would be difficult during flood conditions. The test flood for this dam is 1/2 the Probable Maximum Flood (PMF). The test flood has an inflow equal to 1020 cfs and an outflow discharge equal to 1020 cfs with a stillwater elevation of 397.2 which will overtop the dam by 0.9 feet. The maximum outflow capacity of the spillway with the water surface at the top of the dam is 100 cfs, which is 10 percent of the test flood outflow.
