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 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 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 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 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 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 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 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 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 Wood Creek Dam CT 00486 Dike CT 01707 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 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Wood Creek Dam and Dike form a single purpose flood control impoundment. The dam consists of a 1000-ft. long zoned earth embankment and has a grass-covered 230 foot emergency spillway excavated into the left abutment. The principal spillway is of the drop inlet type and discharges through a 36-inch conduit through the center of the dam. The dam, constructed on a previous foundation, has a central impervious core, a chimney drain within the core and a foundation drain under the downstream portion of the embankment. The impoundment has a maximum capacity of 1,550 Acre-Feet. The condition of both the dam and dike is judged to be good. The impoundment has never been substantially filled so the behavior of the structures under full hydrostatic loading conditions is unknown. The future integrity of the dam could be affected by settlement around and under the outlet conduit, the lack of anti-seep collars on the outlet conduit within the impervious core, erosion along the left upstream toe and on the upstream slope of the dam, erosion and sloughing of the left abutment, and the lack of riprap at the downstream end of the dike between the emergency spillway and the dam. The spillway capacity with the water level at the top of the dam is 7,6000 cfs, 130 percent of the routed Test Flood outflow, resulting in a freeboard of 0.8 feet.

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 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 Program for Inspection of Non Federal Dams Padanaram Reservoir Dam CT 00067 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 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Padanaram Reservoir Dam is an earth embankment with a stone masonry faced downstream slope that is approximately 325 feet long and 26.3 feet high. The downstream stone face is on a 1:12 slope and the upstream earth embankment is on a 2.25:1 slope. The spillway is located at the southern abutment of the dam and is 24-foot long channel. There is a lower gate house in the center of the dam for the control of a discharge pipe that passes through the base of the dam. The size of the discharge pipe is unknown and the valve for its operation is inoperable. The drainage area is 3.7 square miles and the reservoir has 52 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 fair condition with several areas that require attention. These areas include seepage through the dam and along the toe, vegetation on the stone face and along the toe of the dam and the nonoperating status of the blowoff. The dam is classified as small 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 3,608 cfs and the routed test flood outflow is 3,460 cfs. The test flood outflow will overtop the dam by 2.3 feet.

Download or read book National Program for Inspection of Non Federal Dams Cleveland Brook Reservoir Dam MA 00225 Housatonic River Basin Hinsdale Massachusetts 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 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: