National Program for Inspection of Non-Federal Dams. Putman Reservoir Dam (CT 00041), Connecticut Western Coastal Area, Greenwich, Connecticut. Phase I Inspection Report PDF Download
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Languages : en
Pages : 58
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Putnam Reservoir dam consists of a rolled earth embankment with a concrete core wall, built originally in 1893 and modified in 1906 and 1922. The dam section is 640 feet long with a maximum height of 35 feet. The spillway is 55 feet long with an Ogee crest. Based on the visual inspection of the site, review of available information and past performance of the dam, the dam is judged to be in good condition. The maximum spillway capacity at top of dam is 35 per cent of the peak inflow rate of the test flood. Therefore, the test flood cannot be passed by the spillway without overtopping the dam. The overflow will be 1.1 feet above the top of the dam.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 58
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Book Description
Putnam Reservoir dam consists of a rolled earth embankment with a concrete core wall, built originally in 1893 and modified in 1906 and 1922. The dam section is 640 feet long with a maximum height of 35 feet. The spillway is 55 feet long with an Ogee crest. Based on the visual inspection of the site, review of available information and past performance of the dam, the dam is judged to be in good condition. The maximum spillway capacity at top of dam is 35 per cent of the peak inflow rate of the test flood. Therefore, the test flood cannot be passed by the spillway without overtopping the dam. The overflow will be 1.1 feet above the top of the dam.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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ISBN:
Category :
Languages : en
Pages : 58
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Rockwood Lake Dam is an earth embankment reported to have a concrete core wall, built in 1893. The dam section is 1,200 feet long with a maximum height of 36 feet. The top of the dam is 12 feet wide. Riprap is in place on the upstream face. A concrete spillway with a riprapped apron is 80 feet long, with 2-foot wide crest, is located approximately in the center of the dam. The visual inspection indicates that the Rockwood Lake Dam is in poor condition. The major concerns regarding the longterm safety of the dam with respect to soils and geology are the apparent seepage areas on the downstream face of the dam along the toe and particularly in the vicinity of Station 4+25 and 8+25. The maximum spillway capacity at the top of the dam is approximately equal to the discharge rate of the test flood. Therefore, the test flood can be passed by the spillway with minimum overtopping estimated to be 0.1 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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ISBN:
Category :
Languages : en
Pages : 78
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Samuel P. Senior Dam is a linear concrete gravity structure, 990 feet long, with a 300-foot spillway located at the west end of the dam. The spillway is concaved looking downstream and consists of several steps on the downstream side. Approximately 2,000 feet northeast of the dam, a concrete gravity dike 670 feet long is provided. Based on the visual inspection of the site, review of available information and past performance of the dam, the dam is judged to be in good condition. There are surface patches of spalled concrete; however, no structural cracks were observed, nor was any visible evidence of abnormal settlements, heaving, deflections or lateral movements noted. The downstream berm is generally in good condition with no sloughing or wet spots noted. Based on the visual inspection of the site, review of available information and past performance of the dike, the dike is also judged to be in good condition. There are surface patches of spalled concrete; however, no structural cracks were observed, nor was any visible evidence of abnormal settlements, heaving, deflections or lateral movements noted. The maximum spillway capacity at top of dam is 35 percent of the peak discharge rate of the test flood. Therefore, the test flood cannot be passed by the spillway without overtopping the dam. The overflow will be 2.7 feet above the top of the dam.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 74
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The dam is a linear concrete gravity structure with a central spillway. The upstream face of the dam is vertical. The stream face is vertical for 7.5 feet below the top of the dam and then slopes of 7 horizontal to 10 vertical. The spillway is concrete with an ogee shape. Based on the visual inspection of the site, review of available information and past performance of the dam, the dam is judged to be in good condition. The spillway will pass the test flood without overtopping the dam, and therefore the spillway capacity is adequate. Additional investigations to further assess the adequacy of the dam and appurtenant structures do not appear necessary. Patching of deteriorated concrete, initiated by the owner, should be continued. Additionally, during periods of unusually high precipitation, round the clock surveillance should be provided.
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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Category :
Languages : en
Pages : 95
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The 560 foot long dam is an earth embankment with a masonry and concrete corewall. The top of the dam is 10 feet wide and, at elevation 299, is roughly 29 feet above the streambed of an unnamed tributary to the Menunketesuck River. Upstream and downstream slopes are at two horizontal to one vertical and three horizontal to one vertical inclinations, respectively. A stone filter and underdrain runs along the downstream toe of the dam on both sides of the spillway. The 40 foot wide spillway may be described as a broadcrested concrete weir of trapezoidal cross-section. The concrete spillway wingwalls were extended vertically and horizontally by means of gabions when the downstream slope was flattened in 1973. The channel bottom below the concrete spillway apron is lined with gabions, as are the channel sides. There is also a 16 inch diameter low level outlet pipe and a 6 inch diameter low level outlet pipe through the dam from the concrete intake structure to the downstream channel. There is also a 16 inch diameter low level outlet pipe which runs directly from the reservoir through the intake structure and dam to the downstream channel. Based upon the visual inspection at the site and its past performance, the dam appears to be in good condition. No evidence of instability was observed in the dam or it appurtences. There are some areas of seepage requiring monitoring. Based upon our hydraulics computations, the spillway capacity is 920 cubic feet per second (cfs), which is equivalent to 36 percent of the routed Test Flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 93
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Menuckatuck Reservoir Dam is a concrete gravity structure with a downstream earth embankment. The total length of the dam is 248 feet with a maximum height of 58 feet. A 42 foot wide concrete gravity spillway section is located at the right side of the dam. Concrete steps on the downstream face transmit flow to a concrete spillway raceway 300 feet long that discharges to a bedrock channel. The outlet works consist of an intake gatehouse for drawing off water to the supply system and a 36 inch diameter cast iron pipe that serves as the low level outlet. The dam is judged to be in generally good condition. The concrete surfaces were recently gunited and are in good condition. The horizontal and vertical alignment is good. The downstream earth embankment is well-maintained and did not show any evidence of sloughing or seepage. Slight erosion of the embankment was trees have been planted along the crest of the downstream embankment. The concrete spillway weir and spillway raceway are in good condition with minor seepage at construction joints on the floor of the spillway raceway. The capacity of the spillway is inadequate to pass the full PMF test flood outflow (7030 CFS) without overtopping the dam.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 66
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The West Lake Reservoir Dam is an earth embankment that is approximately 450 feet long and 31.7 feet high. The embankment has 1.5:1 side slopes and has a puddled clay and gravel core. The spillway is located through the northern abutment of the dam and consists of a 120-foot long concrete weir. There are upper and lower gate houses for the control of 30-inch water main and a 24-inch blowoff that passes through the base of the dam. The valves for the operation of the water main and the blowoff are in the lower gate house and are inoperable. The drainage area is 3.3 square miles and the reservoir has 3,430 acre-feet of available storage. The assessment of dam is based on the visual inspection, past operational performance and hydraulic/hydrologic computations. The dam is judged to be in fair condition with several areas that require attention. These areas include seepage through the dam and along the toe, steepness of the embankment, vegetation on the embankments, along the toe of the dam and in the spillway channel and the nonoperating status of the blowoff. The dam is classified as intermediate and has a high hazard potential in accordance with guidelines established by the Corps of Engineers. The test flood for this dam is 1/2 the Probable Maximum Flood (PMF). The test flood inflow is 6,520 cfs and the routed test flood outflow is 3,890 cfs. The test flood outflow will overtop the dam by 1.0 feet.
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.
Author:
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ISBN:
Category :
Languages : en
Pages : 20
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