Download or read book National Program for Inspection of Non Federal Dams Goodwin Dam CT 00541 Farmington River Basin Hartland 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 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Goodwin Dam is an earth and rock embankment with an earth core that is 800 feet long and 125 feet high. It has an emergency spillway, channel, gate house and diversion tunnel. The dam and its appurtenant structures are in good condition. The dam will pass the Probable Maximum Flood (recommended Spillway Design Flood) without overtopping the dam. Some recommended measures to be undertaken by the owner, should include the establishment of metering points for seepage measurement and periodic inspections of the dam. It is not urgent to implement these recommendations.

Download or read book National Program for Inspection of Non Federal Dams Farmington Reservoir Dam CT 00263 Connecticut River Basin Farmington 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 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Farmington Reservoir Dam is an earth embankment impounding an unnamed tributary to the Pequabuck River and is reported to have been built in 1895. The dam (including spillway) is 760 feet long and eight (8) feet wide at the top. The dam has a maximum impoundment capacity of 64 acre-feet and is about 8 feet in height from the toe of the downstream slope to the top of the dam. The spillway is a 32 foot long, and 2.8 foot high, concrete, ogee shaped weir. There is no information available on outlet pipes. Based upon the visual inspection at the site and past performance, the dam is judged to be in poor condition. There are areas requiring attention, monitoring, and maintenance such as seeps along the toe of the embankment, erosion on the upstream and downstream slopes, location and operation of outlet and inlet structures and valves, and removal of trees. Peak inflow to the impoundment at the test flood is 315 cfs; peak outflow is 250 cfs with the maximum stage in the reservoir at 383.7, or 1.0 foot below the top of the dam. Based on this information the dam is not expected to overtop at the test flood condition. The spillway capacity with the pool at top of dam is estimated to be 525 cfs which is greater than 100% of the routed test flood outflow.

Download or read book National Program for Inspection of Non Federal Dams Richard s Corner Dam CT 00371 Farmington River Basin New Hartford 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 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Richard's Corner Dam is an earth embankment with a concrete core and is 950 feet long and 75 feet high. It has an emergency spillway, channel, gate house and diversion tunnel. The dam and its appurtenant structures are generally in good condition. The dam will pass the Probable Maximum Flood (Recommended Spillway Design Flood) without overtopping the dam. Some recommended measures to be undertaken by the owner include establishment of metering points for seepage measurements and periodic inspections of the dam.

Download or read book National Program for Inspection of Non Federal Dams Collins Company Lower Dam CT 00380 Connecticut River Basin Avon Burlington 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 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: This facility is a 400 foot long concrete gravity dam across the Farmington River consisting of a 40 foot long right abutment housing three low level sluicee gates, a 300 foot long spillway, and a 60 foot long left abutment with a brick gatehouse housing six intermediate level sluice gates. The hydraulic height of the dam is approximately 33 feet. The six sluices in the left abutment discharge to a 640 foot long canal feeding a powerhouse at the end of the canal, which is not presently in use. The canal was excavated in the left riverbank and is lined with a concrete wall on the right side and a masonry wall on the left side. Based upon the visual inspection at the site, existing data, and past performance, the dam is judged to be in fair condition. No evidence of immediate structural instability of the dam or its appurtenances was observed, however, there is spalling of concrete on the abutments, canal walls, powerhouse bulkhead, and most probably on the crest and downstream face of the spillway and there is a seep at the juncture of the right abutment of the dam with the adjacent bedrock riverbank. The spillway capacity to the top of the dam is 33,000 cfs, which is equivalent to approximately 40% of the routed test flood outflow.

Download or read book National Program for Inspection of Non Federal Dams Lake Garda Dam CT 00264 Connecticut River Basin Farmington 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 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dam is an earth embankment approximately 300 feet long, the top of which is about 17 feet above the bed of Unionville Brook. A concrete corewall runs along the axis of the dam and ties in with the spillway training walls. The crest varies in width from 40 to 90 feet, and is sparsely covered with grass. Several large trees are growing near the downstream edge of the crest. The concrete spillway crest, at the right end of the dam, is 29.5 feet long and about 3 feet below the lowest part of the top of the dam. The low level outlet is a 24 inch pipe through the dam controlled by a gate operated by a hand wheel floor stand located in a concrete block gatehouse on the upstream slope. Based upon the visual inspection at the site and past performance, the dam is judged to be in poor condition. No evidence of structural instability was observed in the earth embankment, other than minor surface sloughing. Deterioration near the base of the right spillway training wall could have become a stability concern, but was repaired during the spring of 1979. Areas requiring attention include trees on the downstream slope and seeps at several locations along the toe of the downstream slope. Based on our hydraulics computations, the spillway capacity is 463 cfs, which is equivalent to approximately 20% of the routed test flood outflow.

Download or read book National Program for Inspection of Non Federal Dams Unionville Reservoir Upper Dam CT 00267 Farmington River Basin Avon 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 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dam of the Upper Unionville Reservoir is an earth embankment with a concrete spillway. It is approximately 220 feet long, 23.8 feet high and has a maximum top width of 10 feet. The Unionville Reservoir Upper Dam was probably constructed in 1909. The Town of Avon presently owns and operates the dam and appurtenant structures. The dam is presently used for passive recreation and to fill the lower pond which is used for swimming. Based on the visual inspection and past operational performance, the dam is judged to be in FAIR condition. A wet area was noted at the downstream toe of the western embankment and there was erosion and/or settlement on the downstream face and top of the embankments. The cover of the intake tower is in fair condition and manhole steps in the intake tower are in poor condition. Access to the tower would be difficult during flood conditions. The test flood for this dam is 1/2 the Probable Maximum Flood (PMF). The test flood has an inflow equal to 1020 cfs and an outflow discharge equal to 1020 cfs with a stillwater elevation of 397.2 which will overtop the dam by 0.9 feet. The maximum outflow capacity of the spillway with the water surface at the top of the dam is 100 cfs, which is 10 percent of the test flood outflow.

Download or read book National Program for Inspection of Non Federal Dams Saville Dam CT 00376 Farmington River Basin Barkhamsted 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 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Saville Dam is an earth embankment with a concrete core that is 1,950 feet long and 135 feet high. It has an emergency spillway and three diversion conduits. The dam and its appurtenant structures are in good condition. The project will not pass the Probable Maximum Flood (PMF) (Recommended Spillway Design Flood) without overtopping the dam. However, the spillway capacity it not judged seriously inadequate as the project will pass approximately 90 percent of the PMF before the dam is overtopped. The spillway can pass the PMF if a 200 foot section of the eastern portion of the dam is sandbagged. This condition is known by the engineering staff of the Metropolitan District. Some recommended to be undertaken by the owner include establishing metering points for seepage measurement and repairs to the upper gate house bridge.

Download or read book National Program for Inspection of Non Federal Dams South Reservoir Dam CT 00487 Dike CT 01709 Connecticut River Basin Farmington West Hartford 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 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book National Program for Inspection of Non Federal Dams Lake Winnemaug Dam CT 00123 Naugatuck River Basin Watertown 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: Lake Winnemaug Dam is an earth embankment approximately 500 feet long with a maximum height of about 15 feet. The upstream slope of the embankment is approximately 1H:1V and the downstream slope is about 1.5H:1V. The top of the dam is about 20 feet wide and it is a paved road. The overflow drop spillway is located about 100 feet from the right abutment and consists of an 18.5-foot long concrete weir, a cascading step section and a 4-foot high by 10-foot wide culvert through the embankment. The original purpose of the dam is unknown; however, the lake is currently used for recreation purposes. The peak test flood inflow for Lake Winnemaug Dam is 3,460 cfs. The routed test flood outflow of 2,010 cfs overtops the dam by about 0.8 feet. The spillway is capable of discharging 770 cfs or about 38 percent of the routed test flood outflow prior to overtopping of the dam. A breach of the dam would result in a 7.8-foot increase in the stream depth (3.8 feet above the channel banks) at the initial downstream damage area. The dam appears to be in poor condition. Numerous structural deficiencies, such as slope failures, seepage, and toe erosion were observed during the visual inspection. The embankment is overgrown with brush and trees and contains a number of rodent holes. The reservoir cannot be drained in an emergency because the outlet pipe control valve is inoperable.

Download or read book National Program for Inspection of Non Federal Dams Whigville Reservoir Dam CT 00379 Farmington River Basin Burlington 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 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Whigville Reservoir Dam is an earthen embankment structure with a concrete/boulder core wall. The dam is 460 feet long and has a maximum height of 54 feet. The 40 foot long concrete/boulder spillway is located at the right side of the dam. Slope paving forms the approach to the spillway. The downstream face is mortared stone masonry. Stone masonry training walls form the wasteway section. The outlet works consist of an upper and lower gatehouse each of which connect to submerged concrete intake structures. A 24 inch diameter blow off pipe passes under the wasteway channel to a stone masonry waste pot. The dam is judged to be in generally poor condition. The riprap on the upstream face is in generally good condition. The vertical and horizontal alignment is good. The downstream slope is covered with an extensive growth of trees and brush. Apparent seepage and wet areas were noted near the toe and at both sides of the spillway channel. The concrete parapet walls are in fair condition, with areas of erosion, spalling and deterioration noted. The concrete spillway weir is in poor condition with severely deteriorated concrete. The spillway is not adequate to pass the PMF spillway test flood outflow (7730 CFS) without overtopping the dam. The test flood would overtop the dam by about 4.2 feet. The spillway would pass about 20 percent of the test flood outflow without overtopping the dam.

Download or read book National Program for Inspection of Non Federal Dams Burr Pond Dam CT 00099 Farmington 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 1980 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Burr Pond Dam consists of a stone masonry wall with an upstream earth embankment. The dam has a maximum height of 17 feet and an overall length of 170 feet, including a 44.7-foot-long overflow spillway located near the center of the dam and auxiliary spillways located on each side of the amin spillway with a total length of 50.5 feet. The outlet works consist of a 6-inch cast iron high level outlet and an 18-inch corrugated metal low level outlet or blowoff controlled by manually operated gates in a gate chamber at the left end of the main spillway. The dam impounds Burr Pond, a portion of Burr Pond State Park and is used for swimming, fishing and boating. Based on the visual inspection, the dam is judged to be in fair condition. Features that can affect the integrity of the dam are the seepage through the left side of the dam, erosion of the upstream slope of the dam, possible development of internal erosion along the root systems of trees near the downstream toe of the dam, and the poor condition of the low level outlet or blowoff pipe. The Test Flood inflow is 1,425 cfs and the routed outflow of 720 cfs results in a freeboard from water surface to the top of the dam of 1.2 feet. The spillway capacity with the water level at the top of the dam is 1,415 cfs and is equal to 197 percent of the routed Test Flood outflow.

Download or read book National Program for Inspection of Non Federal Dams Minnewawa Dam NH 00104 NHWRB 151 06 Connecticut River Basin Marlborough New Hampshire 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 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the visual inspection, available records and past performance, the dam is considered to be in fair condition. Based on size and hazard classifications in accordance with Corps guidelines, the test flood is the PMF. In addition to long term recommendations, there are several remedial measures which should be implemented immediately.

Download or read book National Program for Inspection of Non Federal Dams Ensign Bickford Dam CT 00567 Farmington River Basin Simsbury Connecticut Phase I Inspection Program written by CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV. and published by . This book was released on 1981 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Ensign Bickford Dam consists of a dry stone masonry wall with a maximum height of about 21 feet and an upstream earth embankment. The dam is about 60 feet long, including a 35 foot overflow spillway section in the center of the dam. The spillway has a concrete cap extending back about 10 feet from the crest. The right abutment is a ledge outcrop. An old mill building is located at the left abutment. The impoundment has a water surface area of less than 2 acres and an average depth of about 10 to 12 feet with the water level at the top of the dam. Thus maximum storage capacity is about 24 Acre-Feet. The dam height of 21 feet and storage capacity of 24 Acre-Feet are both below the requirements for a small dam. The dam, therefore does not qualify for the Corps inspection program.

Download or read book National Program for Inspection of Non Federal Dams Middle Pond Dam CT 00283 Farmington River Basin Plymouth 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 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Middle Pond Dam consists of an earth embankment and stone masonry structure with a maximum height of 10 feet a top width of 10 feet and a total length of 535 feet including overflow spillways of 21 feet and 29 feet located near the left end of the dam. A low earthen dike with a maximum height of about 3 feet, a top width of about 5 feet and a length of about 200 feet is located about 150 feet to the left of the dam. Based on the visual inspection, the dam is judged to be in very poor condition. Features that could affect the future integrity of the dam are continued erosion of the upstream slope and crest, trees and stumps on the slopes, seepage through the dam, decreased spillway capacity due to blocking off the right spillway, deterioration of the right spillway, and lack of an operable outlet works. With the right spillway blocked the total spillway capacity of 430 cfs is equal to 17 percent of the Test Flood outflow. With the right spillway restored, the total spillway capacity of 550 cfs would be equal to 22 percent of the Test Flood outflow.

Download or read book National Program for Inspection of Non Federal Dams Batterson Park Pond Dam CT 00262 Connecticut River Basin Farmington New Britain 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 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Batterson Park Pond Dam is an earthfill embankment with stone masonry core that is 1,300 feet long and 30 feet high with a 35 foot wide spillway. It has two, 20 inch blowoffs as well as a line to an adjacent fire hydrant. The dam is classified as intermediate in size and has a high hazard potential based on downstream habitation. based on visual inspection, hydraulic computations and past operational performance, the dam is judged to be in poor condition. Areas of the dam should be studied in order to monitor its behavior such as the central downstream slope which is swampy and shows considerable seepage and the deteriorated spillway channel. The drainage area contributing to the dam is 4.68 square miles. The routed test flood peak outflow (Probable Maximum Flood) is 5,295 cfs which will overtop the dam by 1.21 feet. The project will pass only 29 percent of this peak outflow before overtopping the dam.

Download or read book National Program for Inspection of Non Federal Dams Lake Wintergreen Dam CT 00118 Quinnipiac River Basin Hamden 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 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dam consists of two sections. The portion of the dam from the spillway 185 feet to the left is an earthen embankment on the upstream side of a rubble masonry retaining wall. The remaining portion of the dam to the left of the retaining wall is an earthen embankment. According to the existing information, a rubble masonry corewall exists from the spillway 260 feet to the left. The spillway is reported as a 50-foot-wide concrete weir flowing to a steep channel cut into natural rock formations. A 16 inch diameter high level intake approximately 900 + or - feet to the right of the dam was used as a supply main. The supply main is operable, however the reservoir is not used as a water supply due to the turbidity and poor color quality of the water. A 12 inch, low level inlet passes through the dam, but is presently inoperable. Based upon visual inspections at the site and past performance history, the dam is judged to be inf air condition. No evidence of structural instability in the retaining wall or the embankment portions of the dam was observed. However, the masonry retaining wall is very irregular making it impossible to detect any misalignment or movement of the wall. There are areas requiring attention. Based upon our hydraulic computations, the spillway capacity is 850 cubic feet per second, which is equivalent to approximately 28 percent of the Test Flood. Peak inflow to the reservoir is 3,500 cubic feet per second; peak outflow (Test Flood) is 3,000 cubic feet per second with the dam overtopped 0.8 feet.

Download or read book National Program for Inspection of Non Federal Dams Wintonbury Dam CT 00494 Connecticut River Basin Bloomfield 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 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wintonbury Dam consists of an earth embankment, approximately 1,625 ft. long, with a top width of 12 ft. and a maximum height of 23 ft. The principal spillway consists of a two stage reinforced concrete intake riser discharging through a 30 inch, 145 ft. long reinforced concrete pipe under the dam embankment. The emergency spillway is a trapezoidal grassed channel 110 ft. wide at the control section with its crest 4.5 ft. below the top of the dam. Based on visual inspection and review of available plans and reports, Wintonbury Dam is judged to be in good condition. Some features found existing that could affect the stability of the dam are wheel ruts on the crests and slopes, damage by burrowing animals, and sloughing and eroding of the east and west slopes of the downstream pool area. The dam is a flood control project and therefore the reservoir is dry except during periods of heavy rainfall. With the reservoir dry, the inspection could not reveal seepage conditions. The spillway is capable of passing 300 per cent of the routed test flood outflow without overtopping the dam. The storage capacity to the top of the dam is 1,750 ac.-ft. and up to the test flood level is 1,240 ac.-ft.