Download or read book National Program for Inspection of Non Federal Dams Burnt Hill Reservoir Dam CT 00488 Connecticut River Basin 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 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dam is an earth embankment with a good grass cover. It is approximately 1100 feet long and 38 feet high with a top width of 14 feet. The principal spillway is a reinforced concrete riser with a 30 inch RCP. The emergency spillway is also a reinforced riser with a 60 inch RCP outlet. The 30 inch RCP extends from the principal spillway to the emergency spillway riser. Based on the visual inspection, review of design information, and past operational performance, the dam is judged to be in GOOD condition. There is some erosion due to vehicle trespass and animal burrows were noted in the embankment. The maximum outflow capacity of the spillways with the water level at the top of the dam is 560 cfs, which is 104 percent of the test flood outflow.
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 Government Reports Annual Index written by and published by . This book was released on 1984 with total page 1316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book National Program for Inspection of Non Federal Dams Bugbee Reservoir Dam CT 00491 Connecticut River Basin 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 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bugbee Reservoir Dam consists of an earth embankment, approximately 410 ft. long with a top width of 14 ft. and a maximum height of 20 ft. The low level outlet for the project is the principal spillway which consists of a two-stage reinforced concrete intake riser, a 48-inch reinforced concrete pipe and a 21 ft. long concrete impact basin. In addition to the low level outlet, there is a 200 ft. wide, grassed trapezoidal channel at the dam's south end serving as the emergency spillway. Based on the visual inspection and review of available plans and reports, Bugbee Reservoir Dam is judged to be in good condition; however, during the inspection, there was a light snow cover of two to three inches which may have obscured problems such as erosion or settlement. In addition, since the reservoir area was dry, the inspection could not reveal seepage conditions. With the water level at the top of the dam the maximum spillway capacity is 6000 cfs, which is 175% of the routed test flood outflow. The storage capacity of the reservoir at the top of the dam is 1300 ac. ft.
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 Talcott Reservoir Dam Main Dam CT 00490 Diversion Dike CT 00489 Dike No 2 CT 01710 Connecticut River Basin 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 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: This flood control project consists of three structures: the Main Dam, the Diversion Dike and Dike No. 2. Each structure is an earth embankment at 3H:1V with a good grass cover and a top width of 12 feet. The principal spillways consist of a reinforced concrete riser and 30 inch RCP through the Main Dam and Diversion Dike. The emergency spillways are grassed channels, 40 feet wide in the eastern 1/3 of the Main Dam and 90 feet wide at the eastern end of the Diversion Dike. The reservoir is normally empty except for small sediment pools at the principal spillway inlets. Based on the visual inspection, review of design information and past operational performance, these structures are judged to be in good condition. There is some erosion due to vehicle treepass, some sloughing of the embankments, and animal burrows. These structures are classified as intermediate in size and high hazard potential structures in accordance with the Recommended Guidelines for Safety Inspection of Dams, by the Corps of Engineers. The impoundment storage at the top of the structures is 1205 ac.-ft. The maximum outflow capacity of the spillways with the water level at the top of the dam is 5400 cfs, which is 203 percent of the test flood outflow.
Download or read book National Program for Inspection of Non Federal Dams Crescent Lake Dam CT 00277 Connecticut River Basin Enfield 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: Crescent Lake Dam is about 600 ft. long, 12 ft. high and has a crest width of about 15 ft. It is an earthen embankment with a downstream slope of about 2 to 1 and a variable upstream slope. There is no orthodox spillway structure, but an unlined channel in the reservoir bank near the right abutment serves as a wasteway for reservoir spills. An outlet canal takes off from the reservoir about 600 ft. upstream from the left abutment, which has a concrete headwall incorporating a 38 in. wide notch with stoplog slots. There appears to be no other outlet structure. Maximum storage capacity is about 335 acre-feet. Crescent Lake, used now for recreational purposes, is less than a mile long, has a surface of about 36 acres and a drainage area of about two square miles. The dam is in fair condition. There is some seepage along the downstream toe of the embankment, which has large mature trees growing on it. The lack of any outlet gate precludes drainage the lake without breaching the dam. The test flood would not overtop the dam but would reach within 1/2 ft. of the crest and overtop areas of reservoir bank adjacent to both left and right abutments, which appear to be as much as 2 ft. lower than the crest of the dam. It appears that the valley area east of the Penn Central Railroad track which is just downstream from the dam would absorb outflows up to the test flood magnitude without major consequences to downstream interests.
Download or read book Wasserverh ltnisse der Schweiz written by and published by . This book was released on 1901 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book National Program for Inspection of Non Federal Dams Hallmere Reservoir Dam CT 00249 Connecticut River Basin Berlin 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 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hallmere Reservoir Dam is an earthfill embankment about 570 ft. long and 45 ft. high. It has a concrete core and a riprap covered upstream face. It was constructed in 1896-97 for purposes of water supply. A 30 ft. wide masonry waste-way with s ill and flashboards serves as the spillway. The only regulated outlet is a 20 in. dia. concrete pipe. The maximum storage capacity of the reservoir to top of dam is about 585 acre ft. and the drainage area is about 1 sq. mi. The dam appears to be in fair condition. Brush and tree growth has begun to intrude on the slopes and crest of the embankment. Seepage was noted at the downstream toe of the dam. Animal burrows and missing riprap was apparent on the upstream slope of the embankment. The test flood inflow is 3200 cfs. The routed test flood outflow (2,900 cfs) overtops the dam by 0.7 ft. The spillway is adequate to pass an outflow corresponding to about 51 percent of the routed test flood outflow but the spillway and discharge channel walls would be overtopped by about 5 ft.
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 Higganum Reservoir Dam CT 00430 Connecticut River Basin Haddam 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 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: The crest is generally grassy and the downstream slope is heavily overgrown with trees and shrubs. The upstream face is riprapped above water level and to a depth of about 3.0 feet below the normal water surface. The spillway is located in the center of the embankment and is roughly semicircular and contained between vertical masonry walls. The spillway is constructed of cut stone masonry and flows discharge onto a slab paved with stone blocks leading to a natural stream bed. This dam is considered to be in POOR condition. The visible signs of distress which indicate a potential hazard at this site are: large, wet, spongy areas generally along the entire right toe and lower slope of the dam embankment indicative of seepage; an extremely steep downstream slope; a dense large growth of trees and shrubs on the downstream slope; the small storage capacity of the reservoir relative to its drainage area; the close proximity of the populated area immediately downstream; seepage through the spillway masonry joints and a general lack of proper, regular maintenance. The maximum spillway discharge of 5710 cfs represents 48.5 percent of the test flood outflow.
Download or read book National Program for Inspection of Non Federal Dams Risley Reservoir Dam CT 00211 Connecticut River Basin Vernon Bolton 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 located on a tributary of the Connecticut River on the town line of Bolton and Vernon, Tolland County, Connecticut. It is an earthfill structure approximately 625 ft. long with a maximum depth at its center of 26 ft. The crest width varies from 12 to 15 feet. A vertical granite masonry wall extends from the downstream side of the crest to the bed of Lydall Brook below. The visable part of the upstream embankment has a 1 on 2 to 1 on 3 slope with a riprap face. The downstream embankment consists of cobbles and boulders piled against the face of the masonry wall on an approximate 1 on 1.5 slope. The dam is in generally good condition. It appears to be structurally stable at the present time under normal conditions. Based on its small size and high hazard classification in accordance with the Corps' guidelines, the test flood is 1/2 the PMF. The spillway will pass only about 44 percent of the test flood and is considered inadequate. Recommendations to improve dam safety are: (1) Increase spillway capacity; (2) Replace 6-in. discharge pipe and relocate valve; (3) Add riprap near the center on the downstream side; (4) Divert spillway discharge away from the toe of the dam.
Download or read book National Program for Inspection of Non Federal Dams West Hill Pond Dam CT 00377 Connecticut 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 1979 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: West Hill Pond Dam is an earth embankment about 200 ft. long and 10 ft. high, with a crest about 30 ft. wide carrying a local road. A combined drop inlet spillway and outlet tower structure in ashlar masonry near the upstream slope is connected to a 3 ft. by 1 ft. 6 in. box culvert under the dam, which carries outflows from both the spillway and an outlet controlled by a slide gate. The spillway is about 3 ft. wide, but the size of the outlet gate is not known. West Hill Pond is about 6,500 ft. long and has a surface at normal storage of 246 acres. The drainage area is about 742 acres or 1.16 square miles, and the normal storage is 1,640 acre-ft. Maximum storage at top of dam is 2,525 acre-ft.; the size classification is thus intermediate. The dam appears to be in a generally good condition. Riprap on the upstream slope in the vicinity of the left abutement has been displaced, causing fairly extensive erosion. There are mature trees growing on both slopes of the embankment and the downstream channel is also considerably overgrown. In the vicinity of the outlet to the culvert under the dam, the channel is clogged with boulders and rocks. Spillway capacity is too small to handle any flood inflows; floods are accommodated almost entirely by surcharge, which is sufficient to handle 75% of the full PMF test flood volume, is surcharge above spillway level is not encroached upon. The test flood would overtop the dam by about one ft.
Download or read book National Program for Inspection of Non Federal Dams Killingworth Reservoir Dam CT 00401 Connecticut Coastal River Basin Killingworth 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 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 560 foot long dam is an earth embankment with a masonry and concrete corewall. The top of the dam is 10 feet wide and, at elevation 299, is roughly 29 feet above the streambed of an unnamed tributary to the Menunketesuck River. Upstream and downstream slopes are at two horizontal to one vertical and three horizontal to one vertical inclinations, respectively. A stone filter and underdrain runs along the downstream toe of the dam on both sides of the spillway. The 40 foot wide spillway may be described as a broadcrested concrete weir of trapezoidal cross-section. The concrete spillway wingwalls were extended vertically and horizontally by means of gabions when the downstream slope was flattened in 1973. The channel bottom below the concrete spillway apron is lined with gabions, as are the channel sides. There is also a 16 inch diameter low level outlet pipe and a 6 inch diameter low level outlet pipe through the dam from the concrete intake structure to the downstream channel. There is also a 16 inch diameter low level outlet pipe which runs directly from the reservoir through the intake structure and dam to the downstream channel. Based upon the visual inspection at the site and its past performance, the dam appears to be in good condition. No evidence of instability was observed in the dam or it appurtences. There are some areas of seepage requiring monitoring. Based upon our hydraulics computations, the spillway capacity is 920 cubic feet per second (cfs), which is equivalent to 36 percent of the routed Test Flood outflow.
Download or read book National Program for Inspection of Non Federal Dams Obed Heights Reservoir Dam CT 00414 Connecticut River Basin Old Saybrook 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 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: The project, built in the 1880's, is approximately 465 feet in length including a 27 foot long masonry spillway. The dam is 22 feet in height and, with the reservoir level to the top of the dam, impounds approximately 250 acre-feet of water. The height of the embankment above the spillway crest varies from 3.3 feet to 4.0 feet. The embankment, which reportedly contains a concrete corewall, has a top width a approximately 10 feet, and upstream slope inclination of 2 horizontal to 1 vertical, and a downstream slope inclination varying between 2 horizontal to 1 vertical and 1 horizontal to 1 vertical. The spillway is a broad-crested weir with a crest length of 27 feet and is located at the left end of the dam. Reportedly, the outlet works consists of a submerged intake structure and an 8 inch diameter water supply main through the dam with outlet valves located approximately 1000 feet from the dam. Based upon the visual inspection at the site and past performance, the project is judged to be in poor condition. There is seepage, which requires monitoring; areas such as the dense vegetation of the dam, the irregular shape of the embankment, erosion of the upstream slope, and deterioration of the masonry spillway, which require maintenance; and the questionable condition of the low-level outlet works which requires further investigation. The spillway capacity, with the reservoir level to the low point of the top of the dam, is 480 cfs, which is equivalent to 270% 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 Scovill Reservoir Dam CT 00431 Lower Connecticut River Basin Haddam 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 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scovill Reservoir Dam is an earth embankment dam with stone masonry walls on the upstream and downstream faces. The dam is about 245 feet long, with a maximum height of 21 feet. A spillway section about 25 feet wide and 1 foot deep is located in the central portion of the dam. An abandoned gate structure is located near the spillway section. The dam is judged to be in poor condition. The upstream face of the dam has been overtopped and extensive erosion of the crest is unchecked. Brush is growing on the upstream slope and crest. The downstream area, just below the dam, is wet and spongy, with some seepage observed. Trees are growing at the base of the downstream stone masonry face. The spillway, which consists of an unlined section at the crest where the downstream masonry wall is stepped-down, has eroded significantly and water flowing over the crest continues to cause erosion. The capacity of the spillway is inadequate to pass the 0.75 PMF spillway test flood outflow without overtopping the dam. The test flood would overtop the dam by about 0.7 feet. The spillway would pass only about 14 percent of the test flood outflow without overtopping the dam.
