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 East Mountain Reservoir Dam Waterbury Connecticut written by United States. Army. Corps of Engineers. New England Division and published by . This book was released on 1979 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 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 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 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 National Program for Inspection of Non Federal Dams East Lake Reservoir Dam CT 00066 Housatonic River Basin East Lake Brook Danbury Fairfield County 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 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: East Lake Reservoir Dam is an earthfill embankment about 550 ft. long with a maximum height of about 36 ft. The original dam has been raised and widened to accommodate a local road. The spillway is located at a natural saddle and draw about 300 ft. to the left of the left abutment of the dam. A 15 ft. span bridge constricts the spillway outlet channel. The main outlet is a 16 in. dia. pipe through the dam with a blowoff valve below the toe. A 12 in. dia. pipe connects the outlet pipe to Margerie Lake Reservoir. A second pipe outlet, 12. in. dia., is located near the left abutment. Marshy areas below the dam indicate probable leakage from the reservoir in the vicinities of the two outlet pipes. The serviceability of the outlet control and blowoff valves is doubtful. Both sides of the roadway across the dam are unstable and sloughing down. The dam is judged to be in fair condition. The spillway capacity is inadequate to pass the full PMF test flood outflow of 6,050 cfs; it would pass 50% of the test flood. The test flood would overtop the dam by about 1.7 ft. and the spillway discharge would be 1,750 cfs.
Download or read book National Dam Inspection Program Quillinan Reservoir Dam CT 00024 Housatonic River Basin Ansonia 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 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dam, built in 1880 and reconstructed in 1884, has a total length of a 510 feet and consists of a stone and mortar masonry gravity section (including the spillway) with right and left earth-fill embankments. The top of the masonry section has an elevation of 138.5 and the top of the embankments ranges in elevation from 138.0 to 140.0. The masonry section is 100 feet long and 18 + or - feet in height above the streambed of Beaver Brook. The spillway is a 35.0 foot long broad crested weir, is located at the center of the masonry section and has a crest elevation of 135.0. The outlet facilities are a 2.5 foot by 2.5 foot square conduit at the right end of the spillway and an 8 inch cast iron supply line at the center of the right section of embankment. Based upon the visual inspection at the site and past performance, the project is judged to be generally in poor condition. No evidence of instability was observed in the embankment, masonry section or appurtenant structures. However, there are areas which require monitoring and maintenance such as seepage at the right end of the masonry section, the uneven crest of the embankment and spalling of the concrete apron at the base of the spillway. The spillway capacity (not including low point overflows) with the reservoir level to the top of the dam is 720 cfs, which is equivalent to 29% of the routed test flood outflow.
Download or read book National Dam Inspection Program Upper Kohanza Dam CT 00062 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 1981 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dam is curved in plan and approximately 600 feet long, 31 feet high, and 18 feet wide at the crest. The upstream face is riprapped and has a 3H:1V slope. The downstream face has a 2H:1V slope and is protected by thick grass cover. At the left abutment of the dam is a 12-foot-wide uncontrolled spillway defined by two parallel masonry walls that extend the entire length of the 110-foot-long channel. Discharge from the spillway is channeled past the toe of the dam and returned to Kohanza Brook. At the toe of the dam, approximately 70 feet from the spillway, is a small gatehouse with a hand-operated control valve for operation of the 18-inch-diameter, cast iron, outlet conduit. This conduit passes through the dam and is the only outlet from the reservoir. Visual inspection of the dam and spillway indicated that the structure is in poor condition and in need of repairs and further study. The capacity of the spillway, with the water surface at the top of the dam, is 525 cfs or 219 percent of the routed test flood outflow. As a result, the dam will not be overtopped.
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 National Program for Inspection of Non Federal Dams Middle Reservoir Dam CT 00590 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 1980 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dam of the Middle Reservoir is a concrete and masonry structure. It is approximately 300 feet long, 27 feet high and has an average top width of 8 feet. Based on visual inspection and past operational performance, the dam is judged to be in FAIR condition. Seepage and vegetation was noted on the downstream face and the crest is chipped and spalled due to an unfinished rehabilitation project. The test flood for this dam is 1/2 the Probable Maximum Flood (PMF). The test flood has an inflow equal to 770 cfs and an outflow discharge equal to 765 cfs with a stillwater elevation of 269.4 which will overtop the dam by 1.0 feet. These values represent no flood storage in the upstream Beaver Lake. If use is made of the storage capacity of Beaver Lake, the flood inflow to the Middle Reservoir can be greatly reduced. The dam was not overtopped in the 1955 flood because Beaver Lake was low. The maximum outflow capacity of the spillways under a stillwater condition is 132 cfs, which is 17 percent of the test flood.
Download or read book National Program for Inspection of Non Federal Dams New Naugatuck Reservoir Dam CT 00307 Housatonic River Basin Bethany 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 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: The New Naugatuck Reservoir Dam, built in 1914, consists of an earth fill embankment with a concrete corewall, a spillway and spillway channel with an earth fill embankment dike. The dam is 790 feet long including the spillway. The top of the dam (elevation 540.8) is 20 feet wide and is 80 feet above the streambed of Beacon Hill Brook. The corewall has a top elevation of 537.8 or 3 feet below the top of the dam. The spillway, located at the left end of the dam, is 40.5 feet long at the crest and consists of a concrete ogee weir and a stone paved discharge channel. The dike is 310 feet long, 10 feet high and 10 feet wide at the top. The outlets are a 16 inch upper level outlet at the left side of the dam near the toe of the dike and a 12 inch low-level outlet at the downstream toe of the dam. Based upon the visual inspection at the site and past performance, the dam is judged to be in good condition. No evidence of instability was observed in the dam or dike embankments. The condition of the spillway and outlet channels appear to be good. There are areas requiring attention and monitoring such as seepage along the downstream toe of the dam embankment. The spillway capacity with the reservoir level to the top of the dam is 2,130 cfs, which is 51% of the routed test flood outflow.
Download or read book Portland Reservoir Dam Connecticut River Basin Portland 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 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book National Program for Inspection of Non Federal Dams West Lake Reservoir Dam CT 00070 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 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
