Download or read book National Program for Inspection of Non Federal Dams Chestnut Hill Dam CT 00298 Housatonic River Basin Wolcott 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 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 36.1 foot high dam consists of an earth embankment with a concrete corewall and has a total length of 788 feet including a 28 foot long concrete spillway with permanent stop planks at the left end. The embankment has a top width of 13 feet with a 2 horizontal to 1 vertical upstream slope protected by hand placed riprap to within 2 feet of the top and a 2 horizontal to 1 vertical downstream slope with a 7 foot wide berm about 12 feet from the top. A concrete gate chamber and brick gatehouse are locate on the upstream side of the embankment. The gatehouse houses two hand wheel pedestal gate lifts controlling a 12 inch outlet and a 20 inch outlet from the gate chamber. Based upon the visual inspection at the site and past performances, the project is judged to be in fair condition. No evidence of instability of the project was observed. There are items which require attention, such as trees and brush on and at the toe of the embankment, seepage through the embankment, deterioration of the concrete spillway training wall and outlet headwall, the poor alignment of the spillway discharge channel and low-level outlet channel, and the unknown condition of the 12-inch outlet from the gate chamber. The spillway capacity with the reservoir level to the top of the dam is 980 cfs, which is equivalent to 48% of the routed test flood outflow.

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1984-11 with total page 1028 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Program for Inspection of Non Federal Dams Cornelis Dam CT 00293 Housatonic River Basin Wolcott 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 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Cornelis Dam is an earth embankment with concrete and masonry spillways. It is approximately 330 feet long, 15.3 feet high and has an average top width of 15 feet. The Cornelis Dam was probably constructed in 1917 with subsequent improvements in 1945. The dam is presently owned by the Scovill Manufacturing Company and is operated by the Century Brass Products, Inc. The pond is presently utilized for swimming. 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 of the west spillway and trees and brush are growing on the earth embankments. The test flood for this dam is 1/2 the Probable Maximum Flood (PMF). The test flood has an inflow equal to 6040 cfs and an outflow discharge equal to 6040 cfs with a stillwater elevation of 508.1 which will overtop the dam by 1.9 feet. The maximum outflow capacity of the spillways with the water surface at the top of dam is 2520 cfs, which is 42 percent of the test flood outflow.

Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Program for Inspection of Non Federal Dams Woodtick Reservoir Dam CT 00294 Housatonic River Basin Wolcott 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 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Woodtick Reservation Dam is a cyclopean masonry concrete gravity structure that is 282 feet long and 55 feet high with a 100 foot wide spillway. It has an upper gate house with 20 inch and 30 inch blowoffs. The dam is classified as intermediate in size and has a high hazard potential based on downstream habitation. Based on the visual inspection, past operational performance and hydraulic computations, the dam is judged to be in fair condition. There are areas which should be studied in order to monitor the dam's behavior such as seepage through the body and foundation, spalling and fissuring of the concrete surfaces and the internal state of the dam's body. The drainage area contributing to the dam is 8.57 square miles. The routed test flood peak outflow (Probable Maximum Flood) is 12,670 cfs which would overtop the dam by 3.1 feet. The project will pass only 35 percent of the test flood outflow before overtopping the dam.

Download or read book National Program for Inspection of Non Federal Dams Chestnut Ridge Reservoir Dam CT 00075 Housatonic River Basin Bethel 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 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: The project, built in 1910, consists of an earthfill dam and a separate earthfill dike with a spillway near its center. The spillway is a 22 foot long concrete sill with stop-planks and masonry training walls. The outlet works consist of a gatehouse with high and low level intakes to a 16 inch water supply main. The gate valve is operable. Based upon the visual inspection and its past performance, the project is judged to be in fair condition. No evidence was observed of instability in any component of the project. There is substantial seepage through the dam; the retaining wall at the toe of the dam and the spillway training walls are in a state of disrepair and there is much vegetation on the dike and in the spillway approach and discharge channels. With the stopplanks in place, the spillway capacity is 270 cfs, which is equivalent to 37% 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 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 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 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 West Side Dam CT 00484 Housatonic River Basin Norfolk 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 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: The West Side Dam is a single purpose flood control dam. The dam consists of a compacted earth embankment on a previous foundation with a maximum height of 20 feet, a top width of 14 feet, and a crest length of 730 feet. The principal spillway is of the drop inlet type and discharges through a 36-inch concrete pipe through the center of the dam to an energy dissipator. A grass-covered 120 foot emergency spillway is excavated into the right abutment. Filter drains under the downstream embankment discharge through the side walls of the energy dissipator. The impoundment has a maximum storage capacity of 1,780 Acre-Feet. Based on the visual inspection, the dam is judged to be in good condition. Features that could affect the future integrity of the dam are the seepage and erosion of the right abutment and the emergency spillway. The spillway capacity of 3,000 cfs is equal to 106 percent of the routed Test Flood outflow and results in a freeboard of 0.1 feet.

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 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.

Download or read book National Program for Inspection of Non Federal Dams Beaver Brook Dam CT 00085 Housatonic River Basin Milford Connecticut Phase I Inspection Report written by CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. and published by . This book was released on 1984 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dam was originally constructed of rubble masonry with upstream and downstream earth embankments. In 1928 the dam was reconstructed by removing the upstream earth embankment, constructing a 3-1/2-ft. concrete facing on the upstream face and a concrete cap on the crest, and constructing a new concrete spillway and brick gatehouse. The dam has a maximum height of 17 feet. The spillway is located in the center of the dam and is 20 feet wide and 2 feet below the crest of the dam. Ledge was exposed in the spillway channel. The dam appeared to be in good condition, with only some minor concrete spalling along the crest and lower training wall. The capacity of the impoundment between the dam and U.S. Route 1 is about 11 Acre-Feet. Failure of the dam would release only this lower portion of the impoundment as the highway embankment is unlikely to fail. There is ample storage capacity in the downstream reach to dissipate the flood wave from a failure of Beaver Brook Dam.

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 Stillwater Pond Dam CT 00098 Housatonic River Basin Torrington 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 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dam is an earth embankment approximately 15 feet wide at the crest, 443 feet long and 35 above the streambed of West Branch, Naugatuck River. The spillway is a 193 foot long compound concrete weir. Three outlet pipes (30 inch diameter, 6 inch diameter and 16 inch diameter) run from the bottom of the outlet structure through the downstream training wall. The operating mechanisms for these outlets are in the gatehouse approximately on the centerline of the dam. Based upon the visual inspection and past performance of the dam, the dam is judged to be in fair condition. No evidence of instability was observed in any component of the dam. There is extensive spalling of the downstream face of the spillway; spalling of the top face of the upstream training wall; brush, tree growth and tree stumps on the slopes and crest of the embankment; and disrepair of the gatehouse and security fencing. Based upon the size (Intermediate) and hazard classification (High) of the dam in accordance with Corps of Engineers Guidelines, the test flood will be equivalent to the Probable Maximum Flood (PMF). Peak inflow to the reservoir is 20,400 cfs; peak outflow is 19,800 cfs with the dam overtopped by 0.5 feet. Based upon our hydraulics computations, the spillway capacity is 16,000 cubic feet per second (cfs), which is equivalent to 81% of the routed test flood outflow.

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.