National Program for Inspection of Non-Federal Dams. Menuckatuck Reservoir Dam (CT 00408), Connecticut Central Coastal Area, Guilford, Connecticut. Phase I Inspection Report PDF Download
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
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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.
Publisher:
ISBN:
Category :
Languages : en
Pages : 93
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Book Description
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.
Publisher:
ISBN:
Category :
Languages : en
Pages : 75
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Guilford Lakes Upper dam is a 200 foot long earthfill structure. The earth embankment has vertical walls on the upstream and downstream faces, and has a crest width of 26 feet. The upstream face is a grouted masonry wall and the downstream face is dry masonry. The dam has two adjacent spillways, a low level outlet, and an emergency overflow. Based on a visual inspection at the site, the dam is considered to be in FAIR condition. However, there are several areas of concern which must be corrected to assure the long-term performance of this dam. It is recommended that the owner engage the services of a registered engineer experienced in the design of dams to accomplish the following: (1) Perform a detail hydrologic/hydraulic investigation to assess further the need for and the means to increase project discharge capacity and the ability of the dam to withstand overtopping; (2) Recommend methods to repair or seal the crushed left overflow pipe; (3) Provide procedures for removal of brush, trees, and root systems to a distance of 15 ft downstream from the dam, and select soils to refill any resulting holes. The maximum spillways and emergency overflow capacity is equal to 635 CFS, which represents 14% of the test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
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.
Publisher:
ISBN:
Category :
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 : 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.
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ISBN:
Category :
Languages : en
Pages : 91
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The project, built in 1904, consists of an earthfill dam, a spillway and an earthfill dike. The total length of the project is 760 feet. Both earthfill structures have a concrete corewall which is founded on bedrock. The spillway, located 60 feet from the left side of the dam is a 30 foot long rubble masonry weir with a 12 to 16 inch thick concrete cover and concrete training walls. The outlet facilities are a 30 inch diameter low-level outlet and a gatehouse located on the downstream toe of the dam. The gate valve is operable. The dam is judged to be in fair condition and the dike to be in poor condition. No evidence of instability of the dam embankment or appurtenant structures was observed. There are areas requiring attention, maintenance and monitoring, such as seepage problems which may occur or may be occuring with the new water surface now to the top of the recently installed stop-planks, which is very close to or higher than the corewall. No evidence of instability of the dike embankment was observed. However, brush and trees on the crest and downstream slope could cause seepage through the embankment. The spillway capacity with the stop-planks removed is 1120 cfs or 23% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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ISBN:
Category :
Languages : en
Pages : 124
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The dam, built in 1871, is a 225 foot long stone and mortar masonry gravity dam used for water supply. There are two spillways; a main spillway section at the left end of the dam and an auxiliary spillway approximately 40 feet upstream from the right end of the dam. The two outlets are 24 inch and 16 inch cast iron pipes. The 24 inch pipe is located at the left end of the dam and serves as a low-level outlet or a supply line. The 16 inch pipe is located at the right end of the dam and is used as an emergency supply line. Based upon the visual inspection at the site and past performance, the dam is judged to be in fair condition. The masonry of the dam and training walls appears to be in fair condition. There are areas requiring maintenance and monitoring such as cracks in the mortar joints of the masonry in the dam and spillway walls and seepage at the right end and central portion of the dam. The spillway capacity with the reservoir level to the top of the dam is 2900 cfs, which is equivalent to 18% of the PMF outflow. The spillway capacity does not include flow over the low area in the service road.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
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.
Publisher:
ISBN:
Category :
Languages : en
Pages : 103
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The dam at New Canaan Reservoir is an earth embankment approximately 445 feet long, 37 feet high and having a top width of 21 feet. Built originally about 1898 with subsequent modification from 1929 to 1942, this dam impounds water used by New Canaan, Connecticut. The New Canaan Water Company presently owns and operates the dam including its water works facilities. Based on the visual inspection and past operational performance, the dam is judged to be in fair condition. Seepage was noted on the downstream face. The emergency outlet works have not been operated in some time. The two service bridges were found to be in need of repair. Trees were recently cut on the downstream face and the slope is in an unvegetated state. This dam is classified as small in size and a high hazard potential structure in accordance with the recommended guidelines established by the Corps of Engineers. The test flood for this dam is the Probable Maximum Flood (PMF). The test flood has an outflow discharge equal to 1820 cfs and will overtop the dam by 1.1 feet in a stillwater condition. The maximum outflow capacity of the spillway under stillwater conditions is 240 cfs, which is approximately 13 percent of the test flood. It is recommended that the following items be studied further: The location, condition, and operability of various outlet works; downstream seepage; the composition and adequacy of the dam embankment; the stumps from recently cut trees on the downstream face of the dam; and the deteriorated condition of the service bridge to the gate house.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 58
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Book Description
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.
