Download or read book Lower Housatonic River Basin Waterbury Connecticut Mad River Dam CT 00030 Phase I Inspection Report National Dam Inspection Program written by CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. and published by . This book was released on 1980 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mad River Dam is a stone fill concrete faced dam about 300 ft. long, with a downstream earth embankment and a 60 ft. long central concrete spillway section. The maximum structural height of this dam is 31 ft. A new 3 ft. high concrete parapet wall has been constructed on top of the existing dam. An earthen dike was constructed at the same time, about 190 ft. in length, along the right side of the reservoir. Mad River Dam was used to provide an industrial water supply to the Mattatuck Manufacturing Co. The reservoir has a storage volume of 110 acre-ft. and the size classification is thus small. A breach of the dam could affect the Fairlawn East apartment complex, about 500 ft. downstream of the dam. (Author).

Download or read book National Program for Inspection of Non Federal Dams Risdon Pond Dam CT 00176 Housatonic River Basin Waterbury Connecticut Phase I Inspection Report written by CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. and published by . This book was released on 1981 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Mad River Dam Waterbury Connecticut written by United States. Army. Corps of Engineers. New England Division and published by . This book was released on 1980 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1984 with total page 1176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Housatonic River Basin Waterbury Connecticut East Mountain Reservoir Dam CT 00032 Phase I Inspection Report National Dam Inspection Program written by CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. and published by . This book was released on 1979 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dam, built in the late 1800's, consists of an earthfill embankment with a concrete corewall and two gate houses. The dam is 400 + or - feet long and 12 feet wide at the top. The upstream slope is riprapped to the top of the dam and the downstream slope is covered with grass and has two 12 foot wide berms at elevations 683.8 and 673.8. The top of the dam has a crushed stone cover and at elevation 694.3 is 35 feet above the streambed of East Mountain Brook. A concrete corewall extends 375 feet along the axis of the dam with the top of the corewall 2.5 feet below the dam crest or at elevation 691.8. There are two gate houses, the service gate house at the right upstream end of the dam and the drain gate house at the downstream toe of the dam. The drain gate house contains the valves for the low-level drain outlet and the service gate house contains the facilities for an abandoned water supply line. There is no spillway or any other operational outlet facility other than the low-level outlet. The overall condition of the project appears to be good, however there are areas requiring maintenance and monitoring. No evidence of instability was observed in the dam or appurtenant structures. Based upon the visual inspection at the site, past performance and the lack of a spillway at the dam, the project is judged to be in fair condition. The low-level outlet has a capacity of 28 cfs with the reservoir level to the top of the dam, which is 3% of the routed test flood outflow.

Download or read book National Program for Inspection of Non Federal Dams Lower Housatonic River Basin Shelton Connecticut Trap Falls Reservoir Dam CT 00091 Phase I Inspection Report written by CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. and published by . This book was released on 1978 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dam is a concrete gravity structure with concrete buttresses adjacent to the downstream face of the dam spaced at approximately 18 feet on center. An earthen embankment slopes down from the exposed concrete section at a maximum inclination of 2 horizontal to 1 vertical on the downstream side of the dam. The structure is approximately 1080 feet long and has a maximum height of approximately 48 feet above the old streambed. Outlets consist of a 30 inch cast iron low level line at elevation 172, a 30 inch cast iron transmission main and an 8 inch cast iron service main. The spillway is a 137 foot wide nappe-shaped concrete weir with concrete sidewalls. The area downstream of the dam consists of residential and industrial developments, Connecticut Route 8, and further downstream, urban areas of Stratford. Based upon visual inspections at the site and past performance history, the dam appears to be in good condition. No evidence of structural instability was observed in the concrete section, buttresses or the earthen embankment. However, there are some areas which require attention. Based upon our hydraulic computations, the spillway capacity is 4300 cubic feet per second, which is in excess of 100 percent of the Test Flood. Peak inflow to the reservoir is 2600 cubic feet per second; peak outflow (Test Flood) is 1400 cubic feet per second with the dam maintaining a minimum freeboard of 1.8 feet. It is recommended that the left wingwall adjacent to the spillway be monitored to ascertain whether movement which has occurred to date is continuing.

Download or read book Reuben Hart Reservoir Dam Naugatuck River Basin Torrington Connecticut Phase I Inspection Report National Dam Inspection Program written by United States. Army. Corps of Engineers. New England Division and published by . This book was released on 1978 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thames River Basin Griswold Connecticut Stone Hill Reservoir Dam Phase I Inspection Report National Dam Inspection Program written by United States. Army. Corps of Engineers. New England Division and published by . This book was released on 1979 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mount Higby Reservoir Dam Connecticut River Basin Middletown Connecticut Phase I Inspection Report National Dam Inspection Program written by United States. Army. Corps of Engineers. New England Division and published by . This book was released on 1979 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Program for Inspection of Non Federal Dams Lake Harwinton Dam CT 00367 Lower Housatonic River Basin Harwinton Connecticut Phase I Inspection Report written by CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. and published by . This book was released on 1980 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lake Harwinton Dam is an earth embankment structure 364 feet in length with a maximum height of 30 feet. An earth dike is located north of the dam and they are separated by approximately 80 feet of natural higher ground. The spillway consists of an unlined flat approach channel from the reservoir, a concrete crest 25 feet long, and a concrete discharge channel 25 feet long with a 15 percent slope. Based on the visual inspection, the dam and dike appear to be in fair condition, except for the downstream slope of the dam which is in poor condition. The project has been rated as 'poor'. Minor cracks were observed in asphalt pavement that traverses the crest of the dam. Settlement of 1 to 2 inches was noted in pavement adjacent to the right side of spillway. The vertical and horizontal alignment of the dam/dike was good. considerable erosion has occurred on the downstream slope of the dam in the vicinity of the right abutment. Some sloughing of the riprap on the upstream slope near the crest was evident. Seepage including several small springs was noted downstream from the toe of the dam. Heavy brush and small trees were observed on the downstream slope. The dike is generally in overall fair condition.

Download or read book Government Reports Annual Index written by and published by . This book was released on 1984 with total page 1152 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Program for Inspection of Non Federal Dams Parks Pond Dam CT 00071 Housatonic River Basin Danbury Connecticut Phase I Inspection Report written by CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. and published by . This book was released on 1980 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: Parks Pond Dam is a cyclopean masonry/earth embankment that is approximately 180 feet long and 12 feet high. The earth embankment is on the downstream side and has a 2:1 slope. The upstream face is cyclopean masonry with a vertical face. The spillway is located on the southern half of the dam and consists of a 30.5 foot long weir. There is a lower gate house for the control of a discharge pipe that passes through the base of the dam. The size of the pipe is unknown. The valve for the operation of the discharge pipe is inoperable. The drainage area is 0.5 square miles and the reservoir has 100 acre-feet of available storage. The assessment of the dam is based on the visual inspection, past operational performance and hydraulic/hydrologic computations. The dam is judged to be in poor condition with several areas that require attention. These areas include seepage through the dam and around the spillway's west training wall, deteriorated concrete of the spillway and upstream face of the dam, vegetation on the embankments and along the toe of the dam and the nonoperating status of the blowoff. The dam is classified as small and has a significant 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 625 cfs and the routed test flood outflow is 473 cfs. The test flood outflow will overtop the dam by 0.55 feet.

Download or read book National Program for Inspection of Non Federal Dams Eureka Lake Dam CT 00077 Housatonic River Basin Danbury Connecticut Phase I Inspection Report written by CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. and published by . This book was released on 1979 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: The project consists of two earthfill embankments, a spillway with two masonry weirs, and a masonry gatehouse. The upper embankment forms the reservoir dam, and the lower embankment which is 140 + or - feet downstream, forms a filter basin between the two dams. Based upon the visual inspection at the site and past performance of the dam, the dam is judged to be in fair condition. No evidence of instability of the embankments or appurtenant structures was observed. There are some areas requiring attention, maintenance and monitoring, such as seepage on the downstream slope and toe of the filter basin dam, substantial erosion on the downstream slope of the filter basin dam near the outlet pipes and excessive seepage from the gatehouse drain pipe. Deterioration of the spillway training wall and lower spillway weir, and obstructions in the spillway channel were noted. The upper spillway capacity is 29 cubic feet per second (cfs) and the lower spillway capacity is 66 cfs, which is equivalent to 3% and 6% of the routed test blood outflow, respectively.

Download or read book National Dam Inspection Program Upper Ansonia Reservoir Dam CT 00029 Housatonic River Basin Derby Connecticut Phase I Inspection Report written by CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. and published by . This book was released on 1980 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Main Dam is a masonry gravity structure with a total length of approximately 345 feet, including a 20.5 foot long spillway and a masonry intake structure. The top of the masonry dam, at elevation 309.7 (NGVD), is 2.7 feet above the spillway crest, 20.8 feet above the streambed at the downstream toe of the dam, and varies in width from 3 to 4.5 feet. A bedrock outcrop separates a 200 foot long masonry and earth dike from the left end of the Main Dam. The dike has a top elevation of 309.5 and is approximately 7 feet high. Approximately 700 feet left of the Main Dam and separated from the dike by a small knoll is the East Dam, which consists of a masonry gravity upstream wall and a downstream embankment. The East Dam has a total length of approximately 423 feet, consisting of two sections separated by a low bedrock outcrop which rises to within 5 feet of the top of the dam. The left section is 227 feet in length and 16.2 feet in height and the right section is 196 feet in length and 11 feet in height. The East Dam has a top elevation of 310.0, a top width of 4 to 4.8 feet and does not have a spillway. With the reservoir level to the top of the project, the reservoir impounds approximately 310 acre-feet of water. The spillway capacity with the reservoir level to the lowest point along the top of the dike is 240 cfs, which is equivalent to 28% of the routed test flood outflow.

Download or read book National Program for Inspection of Non Federal Dams Great Hill Reservoir Dam CT 00087 Lower Housatonic River Basin Seymour Connecticut Phase I Inspection Report written by CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. and published by . This book was released on 1978 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dam is a 210 feet long concrete gravity structure with a central concrete round crested ogee weir 40 feet in length, 3.0 feet below top of dam. The dam has a maximum height of 41' feet and a crest width of 6.0 feet. The gate house is adjacent to the left side of the spillway. The regulating outlets include a 16 inch direct supply main and a 20 inch low level intake, which outlets at the toe of the spillway. Based upon the visual inspection and past performance of the dam, the condition of the dam is generally good. The dam appears stable with no signs of movement or settlement. Visual inspection did not disclose an unstable condition due to seepage through the foundation or instability of the dam foundation or abutments. Based upon our hydraulic computations, the spillway capacity is 810 cubic feet per second, which is equivalent to approximately 13 percent of the Test Flood. Peak inflow to the reservoir is 6,600 cubic feet per second; peak outflow (Test Flood) is 6,400 cubic feet per second with the dam being overtopped by 3.6 feet. The spillway is not adequate and will pass only 810 cfs at elevation 290 (top of dam). The average downstream flood stage along Fourmile Brook to its confluence with the Housatonic River will be 10 feet for an outflow of 13,300 cubic feet per second. The major impact of such a flood stage would be to wash out the bridge at Route 34 and another masonry arch located 100 feet upstream of Route 34. Before being washed out, back up would undoubtedly occur effecting a day nursery and at least one dwelling. Thus damage to life and property can occur in the vicinity of Route 34, on the east Bank of the Housatonic River, one mile below the dam.

Download or read book National Program for Inspection of Non Federal Dams Whiting River Dam CT 00483 Housatonic River Basin North Canaan Connecticut Phase I Inspection Report written by CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. and published by . This book was released on 1981 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Whiting River Dam is a single purpose flood control dam. The dam consists of a zoned earth embankment with a maximum height of 80 feet. The dam is 580 feet long and has a grass-covered 250 foot emergency spillway excavated into the left abutment. The principal spillway is of the drop inlet type and discharges through a reinforced concrete conduit through the center of the dam. As the dam is used for flood control, the impoundment remains at the principal spillway level except during periods of heavy runoff. The impoundment has a maximum storage capacity of 5,000 Acre-Feet. Based on the visual inspection and a review of all available pertinent data, the condition of the dam is judged to be good. The impoundment has never been substantially filled so the behavior of the structure under full hydrostatic loading conditions is unknown. The future integrity of trhe dam could be affected by the construction of the right side of the emergency spillway on fill, the location of the emergency spillway in the vicinity of the downstream toe of the dam, and the settlement and erosion of the stone drains at the abutments. The spillway capacity with the water level at the top of the dam is 14,800 cfs, 88 percent of the routed Test Flood outflow. The Test Flood would overtop the dam by 0.5 feet.

Download or read book National Program for Inspection of Non Federal Dams Margerie Lake Reservoir Dam CT 00063 Housatonic River Basin Danbury Connecticut Phase I Inspection Report written by CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. and published by . This book was released on 1978 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Margerie Lake Reservoir Dam is an earthfill embankment about 735 ft. long with a maximum height of about 28.5 ft. and a crest width of 10 ft. It is located at the south end of the reservoir. The dike at the north end is also an earthfill embankment, about 1,104 ft. long with a maximum height of about 16 ft. The spillway is located at the right abutment of the main dam, all or mostly in ledge rock, and a 1.2 ft. high concrete control sill with its crest 6.5 ft. below the crest of the dam, near the low point of the valley. The outlet is a 30 in. dia. pipe through the dam and continued in buried trench to the filter plant about 600 ft. south of the dam. No bypass or blowoff from this outlet has been provided. The dam appears to be in good condition. The spillway is adequate to pass the full PMF test flood without overtopping the dam. The north dike also appears to be in good condition. Seepage at the downstream toe of the dam was noted. A toe drain at the north dike appears to be functioning as intended. The outlet control valves may not be serviceable.