National Program for Inspection of Non-Federal Dams. Whitney Dam (CT 00477), Thames River Basin, Stafford, Connecticut. Phase I Inspection Report PDF Download
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 96
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Whitney Dam consists of a 1,400 foot long earth embankment and a 120 foot wide grassed emergency spillway. The outlet consists of a concrete riser with 7.5 foot long weirs on each side and a 30-inch reinforced concrete outlet pipe discharging into Patten Brook at the toe of dam. Maximum height of dam is 52 feet with a maximum storage capacity of 1,960 acre-feet. Based on the visual inspection, Whitney dam appears to be in good condition. Only one small cedar tree is growing on the embankment and there is evidence of recreational vehicles climbing the embankment in three locations. The rodent screen on one foundation drain outlet is partially missing and the slide gate stem at the principal spillway outlet is bent and appears to be inoperative. Calculations by the Soil Conservation Service show a peak inflow of 6,500 cfs. and a peak outflow of 1,930 cfs. with a maximum water surface elevation 2.0 feet below the crest of dam, which was used as the test flood.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 96
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Book Description
Whitney Dam consists of a 1,400 foot long earth embankment and a 120 foot wide grassed emergency spillway. The outlet consists of a concrete riser with 7.5 foot long weirs on each side and a 30-inch reinforced concrete outlet pipe discharging into Patten Brook at the toe of dam. Maximum height of dam is 52 feet with a maximum storage capacity of 1,960 acre-feet. Based on the visual inspection, Whitney dam appears to be in good condition. Only one small cedar tree is growing on the embankment and there is evidence of recreational vehicles climbing the embankment in three locations. The rodent screen on one foundation drain outlet is partially missing and the slide gate stem at the principal spillway outlet is bent and appears to be inoperative. Calculations by the Soil Conservation Service show a peak inflow of 6,500 cfs. and a peak outflow of 1,930 cfs. with a maximum water surface elevation 2.0 feet below the crest of dam, which was used as the test flood.
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Category : Science
Languages : en
Pages : 492
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 114
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Ellithorpe Dam consists of a 4,250 foot long earth embankment and a 200 foot wide grassed emergency spillway. The outlet consists of a concrete riser with 23 foot long weirs and a 48-inch reinforced concrete outlet pipe discharging to Middle River at the toe of dam. Based on the visual inspection, Ellithorpe Dam appears to be in good condition. There are several recreational vehicles paths on the slopes with some erosion taking place. Also, there are numerous rodent burrows on the upstream slope. Maintenance practices at Ellithorpe Dam appear to be good. Based on Corps of Engineers guidelines, the PMF was calculated to be 16,900 cfs inflow, with the outflow 10,800 cfs at an elevation of 591.6, which is 0.6 feet over the top of dam. This flow was used as the test flood.
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Category : Government reports announcements & index
Languages : en
Pages : 1304
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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The dam, completed in 1961, is an earth embankment approximately 390 feet in length with an emergency spillway at its left with end. It is a flood control project approximately 28.5 feet in height and capable of impounding approximately 520 acre-feet of water. The principal spillway is a drop inlet type structure consisting of a reinforced concrete riser with a 24 inch diameter reinforced concrete outlet pipe through the dam. The grass-bottomed emergency spillway channel is cut into natural ground at the left end of the dam and has a crest length of 125 feet. The top and slopes of the dam are grass covered, with a filter drain at the toe of the downstream slope. Based upon the visual inspection and past performance, the dam is judged to be in good condition. No evidence of instability was observed in the project. There are some remedial measures, such as filling of large holes in the 'waste areas' adjacent to the dam, reestablishment of greasy vegetation in the vehicle tracks on the top of the dam, and institution of a biennial inspection program, which require attention. The spillway capacity with the pond level to the top of the dam is 4700 cfs, which is equivalent to 1300% of the routed test flood outflow.
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Category : Government reports announcements & index
Languages : en
Pages : 1092
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 74
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The dam is comprised of an earthen embankment on the upstream side of a near-vertical rubble stone masonry wall, which is approximately 340 feet in length and rises approximately 37 feet above the original streambed elevation of the Mill River. The upstream earthen embankment is approximately 20 feet wide at the dam crest and has an upstream slope with a maximum inclination of 3 horizontal to 1 vertical. The right portion of the spillway is a concrete compounded circular crest with a sloped downstream face. The left portion of the spillway is a side channel concrete ogee section. The area below the dam is developed with industrial buildings, a high school, and residential structures. Based upon the visual inspection at the site and past performance of the dam, the dam is judged to be in good condition. No evidence was observed of structural instability in the earthen embankment or the masonry wall. The condition of both the embankment and wall appears to be good. There are some areas requiring attention. Based upon our hydraulics computations, the spillway capacity is 9700 cubic feet per second, which is equivalent to approximately 21 percent of the Test Flood. Peak inflow to the reservoir is 48,600 cubic feet per second; peak outflow (Test Flood) is 46,500 cubic feet per second with the dam overtopped 4.4 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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Category :
Languages : en
Pages : 96
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Ellis Dam consists of a 490 foot long earth embankment and a 150 foot wide grassed emergency spillway. The outlet consists of a concrete riser with 6 foot long weirs on each side and a 24-inch reinforced concrete outlet pipe discharging to Ellis Brook at the toe of dam. Maximum height of dam is 40 feet with a maximum storage capacity of 824 acre-feet at crest elevation. Based on the visual inspection, Ellis Dam appears to be in good condition. There was some deterioration of the concrete on the top of the principal spillway riser, but repairs had been made. Also, there was some settlement in what appears to be a spoil area used during construction. The plans show a slide gate at the inlet to the principal spillway buy only some of the fittings are in place. Maintenance practices at Ellis Dam appear to be good. Soil Conservation Service design for this dam used a rainfall of 15 inches and a runoff of 13.5 inches for the emergency spillway design. The design flood results in a peak inflow of 4985 cfs and a peak outflow of 2396 cfs with a maximum water surface elevation 2.0 feet below the crest of dam, which was used as the test flood.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 102
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The dam, substantially completed in 1957 and certificate of approval dated April 27, 1972, consists of an earth embankment with a concrete corewall and a concrete spillway. The embankment is 580 feet long, has a maximum storage capacity of 185 acre-feet, and is 22 feet in height above the streambed of Diamond Ledge Brook at the toe of the dam. The top of the dam (elevation 21.0) is 20 feet wide and 6 feet above the spillway crest. The upstream slope and top of the dam have a sod cover except at the left end where there is a sandy beach area. The spillway consists of a 10 foot long and 3 foot wide broad-crested concrete weir and a rectangular chute (fish ladder) which extends 65 feet to the toe of the dam. The low-level outlet facility is an 8 inch corrugated metal pipe which is encased in concrete and located to the left of the spillway and gated at the downstream slope. Based upon the visual inspection at the site and past performance of the dam, the project is judged to be in fair condition. There are items requiring maintenance and monitoring such as seepage along the toe of the dam, cracking along the joints of the spillway chute, and the lack of proper slope protection. Also, the fill being dumped along the downstream slope should be graded to a lesser slope and slope protection placed. The spillway capacity with the lake level to the top of the dam is 440 cfs, which is 81% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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ISBN:
Category :
Languages : en
Pages : 74
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The dam built around 1852, has a total length of approximately 293 feet, consisting of a 113 foot long, broad-crested masonry spillway between two 90 foot long embankments with masonry downstream faces. The top of the embankments, at elevation 519.0, are approximately 14 feet wide and 3 feet above the spillway crest. The dam is 22 feet in height above the streambed of Furnace Brook and, with the pond level to the top of the dam, impounds approximately 105 acre-feet of water. At the right end of the dam is a canal leading to the Warren Corporation mill downstream. The inlet to the canal is a 6 foot wide by 5.5 foot deep masonry arch culvert. Based upon the visual inspection at the site and past performance, the project is, judged to be in fair condition. No evidence of instability of the project was observed. However, there are items which require maintenance and/or evaluation, such as deteriorated masonry at several locations on the dam and the absence of a low-level outlet for the dam. The spillway capacity, with the reservoir level to the top of the dam, is 1,900 cfs, which is equivalent to 16% of the routed test flood outflow.
