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 Beaver Dam Lake Dam CT 00083 Housatonic River Basin Stratford 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 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beaver Dam Lake Dam is a 1300 foot long earth embankment dam and has a maximum height of 47.3 feet. The top width of the dam is 16 feet. The spillway is located on the left side of the embankment. It appears that the original earth embankment am which was approximately 20 feet in height was raised 27 feet to its present height. The visual inspection of Beaver Dam Lake Dam indicated that the dam is in fair condition. The inspection revealed the existence of a foot path along the entire crest of the dam. The right 800 foot long portion of the dam shows the crest of the dam to be sloping toward the reservoir (upstream) by as much as 12 inches. Riprap in some areas of the upstream slope of the embankment has been eroded. The upstream gatehouse foundation has separated from the gate chamber wall by as much as 3 inches and this crevice extends to a depth of 5 feet below ground surface. An extensive growth of grass, briars, rosebushes and brush cover the upper downstream slope of the embankment. The lower slope is covered with grass, brush and many trees. Also, numerous animal holes up to 12 inches in diameter were observed on the downstream face of the dam. The spillway will pass the test flood outflow of 1225 cfs with a pool elevation of 176.15 feet which is 1.65 feet below the top of the dam.

Download or read book Government Reports Annual Index written by and published by . This book was released on 1984 with total page 1296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.

Download or read book National Program for Inspection of Non Federal Dams Norfolk Brook Dam CT 00485 Housatonic River 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 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Norfolk Brook Dam and Dike form a single purpose flood control impoundment. The dam consists of a 440-ft. long zoned earth embankment with a grass-covered 80-foot emergency spillway excavated into natural ground between the dam and dike. The principal spillway is of the drop inlet type and discharges through a 30-inch conduit through the center of the dam. The dike consists of a zoned earth embankment of the same cross section as the dam. The dike has a maximum height of 28 feet and a length of 270 feet. As the impoundment is used for flood control, it remains empty except during periods of heavy runoff. The impoundment has a maximum storage capacity of 730 Acre-Feet. Based on the visual inspection and a review of all available pertinent data, the condition of the dam is judged to be fair. The impoundment has never been filled so the behavior of the structure under full hydrostatic loading conditions is unknown. The future integrity of the dam could be affected by a lack of good grass cover on the spillway and embankment slopes and riprap slope protection at the plunge pool for the outlet of the principal spillway. The spillway capacity with the water level at the top of the dam is about 1,870 cfs, 134 percent of the routed Test Flood outflow. The Test Flood would leave a freeboard of 0.6 feet.

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1984-10 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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

Download or read book National Program for Inspection of Non Federal Dams 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 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 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 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 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 Mercers Pond Dam CT 00068 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 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mercers Pond Dam is an earth embankment approximately 400 feet long and 17 feet high. Granite blocks line the downstream face (250 feet). A 39-foot long spillway is located at the western end of the dam. There is a 24-inch discharge pipe with a slide gate on the upstream face of the dam. The gate is not operable. The drainage basin is 4.5 square miles on which 3.3 square miles is controlled by another dam upstream. There is approximately 61 acre-feet of storage available. 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 along the toe of the dam, the poor condition of the stone face and the nonoperating status of the discharge pipe. 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 these conditions is the Probable Maximum Flood (PMF). The test flood inflow is 6,150 cfs and the routed test flood outflow is 5,885 cfs. The test flood will overtop the dam by 2.75 feet.

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

Download or read book National 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 Wangum Lake Dam CT 00516 Housatonic River Basin Canaan 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 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wangum Lake Dam is a 300-foot long earth embankment with a maximum height of about 10 feet. The upstream face of the dam is on a slope of about 1H:1V and the downstream face of the dam is variable, with the slope averaging about 5H:1V. the crest width averages about 35 feet. The spillway consists of a masonry weir about 5.5 feet wide with a crest elevation about one foot below the top of the dam. A 12-inch diameter valve is located in the center of the spillway headwall. The invert of the valve is one foot below the spillway crest. The spillway discharge travels 15 feet through a stone-paved outlet channel and into a 24-inch diameter cast iron pipe. The pipe directs the discharge into a small mill pond located at the downstream toe of the dam. The dam appears to be in fair condition. The upstream face is provided with limited riprap protection resulting in exposure of portions of the embankment to erosion. The normal pool freeboard of about one foot exposes the dam crest to wave action. The dam was overtopped by an estimated 3 inches in 1972, which indicates that the spillway discharge capacity and reservoir storage capacity above normal pool are inadequate for appreciable storm events. The continued deterioration of the headwall at the entrance to the spillway outlet conduit could lead to obstruction of the pipe entrance. No emergency low-level outlet, independent of the water supply system, exists at this site. The spillway system is capable of discharging 19 cfs, which is about 2 percent of the routed test flood outflow, prior to overtopping of the dam.

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

Download or read book National Program for Inspection of Non Federal Dams 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.