Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 69
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The dam, built around 1920, has a total length of approximately 400 feet, consisting of a 184 foot long board-crested masonry spillway, a 190 foot long earth embankment, and a 27 foot long sluiceway. The top of the embankment, at elevation 88.7, is approximately 20 feet wide, 8.7 feet above the spillway crest, and 23 feet above the streambed of the Little River. With the pond level to the top of the dam, the pond impounds approximately 1000 acre-feet of water. The sluiceway at the left end of the dam leads to abandoned factory buildings about 400 feet from the dam. The intake to the sluiceway is a wood bulkhead, which contains 5 gates. Based upon the visual inspection at the site and past performance, the project is judged to be in poor condition. No evidence of instability of the project was observed. However, there are items which require maintenance, such as the dense vegetation on the embankment and the inoperable sluice gates. The spillway capacity with the pond level to the top of the dam is 13,000 cfs, which is equivalent to 108% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 71
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Papermill Pond Dam is a 573 ft. long composite rubble masonry, concrete, and earth embankment dam consisting of a 124.5 ft. long gravity masonry overflow section, and 84 ft. long earth embankment to the right of the overflow section and a 365 ft. long earth embankment to the left of the overflow section. About 160 ft. of the upstream face of the left embankment is paved with concrete. It is a run-of-the-river dam which is used for storing process water for a paper mill located upstream on the left bank of the river. In the left embankment there is an intake which controlled flows through a conduit to a turbine facility in a mill building located immediately downstream of the dam. The turbine has been abandoned and the mill building is in the process of being razed. The spillway for the dam is equipped with 2.3 ft. high permanent wooden flashboards. The dam is judged to be in generally good condition, but is rated as in fair condition owing to the absence of a dewatering facility. There is brush growth on both embankments. Mortar is missing from the joints of the rubble masonry section of the spillway. There is a crack in the concrete apron on the left embankment and the construction joints of the apron have opened up. Minor erosion has taken place on the downstream slope of the left embankment. The spillway can pass 7,750 cfs or about 72 percent of the routed test flood outflow without overtopping the right embankment.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 492
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Book Description
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 108
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Book Description
The dam, constructed in 1964 and 1965 to replace an earlier dam which failed in 1963 is an earth embankment approximately 435 feet in length with an emergency spillway at its right end. It is approximately 30.5 feet in height and has a maximum design storage of approximately 235 acre-feet. The principal spillway is a drop inlet structure. The dike, built the same time as the dam is approximately 740 feet in length and 18.5 feet in height. The upstream slope is protected by riprap to approximately 3 feet above the normal pool and grassed to the top of the slope. There is a paved roadway along the top of the dike embankment and the downstream slope is grassed and contains a toe drain. Based upon the visual inspection and past performance, the project, is judged to be in good condition. No evidence of instability of either the dam or dike was observed. Peak inflow to the pond at PMF is 780 cubic feet per second (cfs); peak outflow is 490 cfs with the dam and dike maintaining 3.0 feet of freeboard. The combined spillway capacity to the top of the project is 1142 cfs, which is equivalent to 230% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 83
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Book Description
The dam, built in the 1870's, has a total length of approximately 425 feet and consists of an embankment section with upstream and downstream masonry faces and a masonry spillway section. The dam is 19.5 feet in height above the old streambed of Hunts Brook and, with the pond level to the top of the dam, impounds approximately 700 acre-feet of water. The spillway is an 87.8 foot long broad-crested weir located at the right end of the dam and is founded on bedrock. Based upon the visual inspection at the site and past performance, the project is judged to be in poor condition. There are areas which require monitoring and/or maintenance such as: seepage at several locations on the downstream face and toe of the dam, seepage of the low-level outlet culvert, the inoperable low-level outlet gate, eroded areas on the top of the dam, deteriorated masonry at several locations on the dam, and possible erosion or undermining due to high velocity flows along the downstream toe of the spillway and dam. Peak inflow to the reservoir at the 1/2 PMF is 8,610 cubic feet per second; peak outflow is 7,730 cfe with the dam overtopped by 2.7 feet. The spillway capacity with the reservoir level to the top of the dam is 1,610 cfs, which is equivalent to 21% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 103
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The Packers Pond Dam, built about 1880 to provide water for industrial use, is an earth embankment impounding 450 acre-feet of water on Mill Brook. The length of the dam, including the spillway, is 325 feet. The top of the dam averages between 12-15 feet in width and is approximately 18 feet above the old streambed at the spillway discharge channel. The spillway, located at the right end of the dam, is a 64 foot long, broad-crested, stone masonry structure which provides 4.4 feet of freeboard from the crest to the top of the dam. The outlet is a concrete intake and gate structure located on the upstream slope at the left end of the dam. The gate is not functional and the size of the outlet could not be exactly determined. However, the outlet is assumed to be approximately 3 feet wide by 2.5 high. A railroad embankment runs along the downstream toe of the dam. This embankment is about 24 feet in height, with the top of the embankment approximately 12 feet higher than the top of the dam. The spillway capacity with the pond level at the top of the dam is 1700 cfs, which is 28% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 85
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Book Description
North Grosvenordale Pond Dam is a composite masonry and earth dam consisting of two downstream stepped, ashlar faced masonry overflow sections, a granite block and earth fill right abutment and an earth fill right abutment and and earthfill dike on the left abutment. The entire length of the dam is about 2,400 ft. It is a run-of-the-river dam which once served the industrial needs of the downstream mill. Outflows through the millrace are now used for fire protection of the mill. North Grosvenordale Pond is about 1.5 miles long and has a surface area at spillway level of about 60 acres. The drainage area above the dam is about 99 sq. mi. and the maximum storage to the top of the dam is estimated at about 840 acre-ft. The dam is judged to be in generally fair condition. At the time of the inspections, water was flowing over the right spillway, so that it was not possible to observe the condition of the downstream ashlar face, or to determine whether there is any erosion at the toe of the spillways. The crest of the left spillway is higher than the right spillway. The difference is less than 6 in. The sluiceway through the left spillway is inoperative. Some of the left spillway stones have been dislodged and displaces. Several joints in the training walls are in need of repointing. The bridges over the spillways are in a deteriorating condition. Tree and brush growth is abundant along the left abutment dike. The spillways are not adequate to pass the 1/2 PMP test flood of 25,400 cfs without overtopping the non-overflow sections of the dam. The test flood would overtop the dike by about 2.2 ft. The spillway can pass 4,950 cfs or about 20 percent of the test flood without overtopping the dike.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 110
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Book Description
The dam consists of a concrete principal spillway, embankments to the right and left of this spillway and an emergency spillway near the right end of the dam. The principal spillway is a concrete chute with weir-boards at the upstream end and the emergency spillway is an unlined channel cut into the right end of the embankment. A swale, which will overflow to the toe of the dam at approximately the same elevation as the auxiliary spillway, exists at the left end of the dam. There is no low-level outlet at the dam. Based upon the visual inspection at the site and past performance, the dam appears to be in fair condition with items which require repair, maintenance and monitoring. These include spalling of the concrete walls at the principal spillway, seepage through the embankments, trees and brush on the embankments and in the emergency spillway, erosion of the upstream slopes, extending the embankment to fill the swale at left end of the dam, and debris and overhanging brush in the spillway discharge channels. The total spillway capacity at the same pool level is 820 cfs, which is greater than 100% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 127
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Book Description
Pachaug Pond Dam is an earth embankment which has a maximum height of 17.0 ft. and is approximately 770.0 feet long. The dam is considered to be in fair to good condition. A spillway design test flood 24,800 cfs (equal to the PMF) will overtop the dam by approximately 4.0 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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Book Description
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.
