National Program for Inspection of Non-Federal Dams. Watershops Pons Dam (MA 00569) Connecticut River Basin, Springfield, Massachusetts. Phase I Inspection Report PDF Download
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 102
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Book Description
Examination of available documents and visual inspection of the dam and appurtenant structures did not reveal any conditions which would render the project inadequate. The elevation-discharge relations indicate that the inflow from one half the Probable Maximum Flood could be passed over the dam with a head of 8 ft. if the abutments were high enough. No remedial measures are required at this time by the owner. (Author).
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 102
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Book Description
Examination of available documents and visual inspection of the dam and appurtenant structures did not reveal any conditions which would render the project inadequate. The elevation-discharge relations indicate that the inflow from one half the Probable Maximum Flood could be passed over the dam with a head of 8 ft. if the abutments were high enough. No remedial measures are required at this time by the owner. (Author).
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 75
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Book Description
The dam is generally comprised of a 401-foot long, 10 to 28 foot high main spillway, a head gate building, an overflow canal spillway and a canal leading to two 8 foot diameter penstocks used in electrical power generation. There are two inoperable gates located in the main dam. The dam is normally operated with two feet of flashboards above the spillway crest. The visual inspection did not disclose any findings that indicate an immediate unsafe condition. The 1 /2 PMF test flood used will produce an inflow/outflow of 70,830 cfs. The dam is a run-of-the-river type and the spillway crest would be overtopped by about 14 feet. The spillway has a capacity of 29,500 cfs (42 percent of 1/2 PMF outlfow) at elevation 166.6, top of non-overflow section. The non-overflow section is overtopped by about six feet. This flow would not overtop the upstream training walls which are at elevation 174.0. The overall condition of the dam is considered fair due to the lack of adequate draw down capacity. Remedial measures consist of removing vegetation from the downstream face of the dam, further observation of seepage at the right abutment, repair the wooden crest cover, and develop a formal warning system to warn downstream areas in case of an emergency.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 56
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Book Description
The dam is about 48 ft. long and 13 ft. high. It is constructed of cut stone masonry. The dam is generally in poor condition. The right end of the dam has had a partial failure at the crest. The dam is classified as small in size with a hazard potential of low. Recommendations for remedial work include repair of the failed area at the right end of the crest of the dam, the plugging of pressure leaks in the dam and mortaring of open joints, and the repair of erosion damage at the right abutment. (Author).
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 94
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Book Description
Silver Lake Dam is an earthfill embankment about 85 feet long, 12 feet high with a crest width averaging about 30 feet. The project appears to be in fair condition. Since the dam is classified as small in size, with a significant hazard potential, the test flood is one half the PMF. (Author).
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 103
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Book Description
The Van Horn Park Upper Dam is an earth dam about 550 feet long with a maximum height of 32 feet and crest width of 50 feet. The upstream and downstream slopes of the embankment as observed are approximately 1(V): 1.5(H) and 1(V): 2(H), respectively. Both slopes are covered with a heavy growth of trees, bushes, shrubs and ground cover. Located approximately at the center of the dam is an uncontrolled outlet for the pond consisting of a reinforced concrete double box culvert and spillway chute. There is also an uncontrolled low level outlet located at the north abutment. (Author).
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 87
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Book Description
Forest Park Upper Dam is an earthen embankment approximately 450 feet long and 23 feet high, the 40 foot wide crest carries a park roadway. A semicircular drop inlet spillway located near the center of the dam's upstream face discharges into a culvert beneath the embankment. The gated reservoir drain is incorporated in the spillway weir. The presence of numerous trees and eroded areas on the embankment resulted in the dam being considered only in fair condition. The spillway was determined to be adequate to pass the routed test flood outflow of 1475 cfs with approximately 5.1 feet of freeboard remaining for the dam. The maximum spillway capacity with a flood stage at the top of the dam is 2160 cfs. An investigation is recommended to determine appropriate modifications and repairs for the protection of embankment slopes. Remedial measures to be taken by the Owner include the temporary repair of eroded areas, the cleaning and repair of catch basins and drains and the repair of the spillway and outlet culvert.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 93
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Book Description
The dam is a 700 foot, 35 foot high earthfill embankment and a 920 foot long, 15 foot high earth-fill dike a gatehouse with outlet controls and a 10 foot wide concrete arch emergency spillway. With the water lever assumed to spillway crest at time of test flood, spilway discharge of about 30 cfs woudl occur. The reservoir woudl be surcharged to elevation 433, four feet above the spillway crest and two feet below the dam crest. The dam will not be overtopped. The dam is generally in fair condition. Remedial measures consist of removal of all brush and trees from the downstream slope of the main dam and spillway channel and repair of spalled and deteriorated concrete on the emergency spillway.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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Book Description
This dam is comprised of two earth embankments with a central twin 8 foot wide concrete box culvert with concrete training walls. The inspection indicated the dam to be in generally good condition. The dam has a size classification of intermediate and a hazard classification of low. The test flood would be one-half the PMF.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 111
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Book Description
The dams are in fair condition, due to the potential overtopping of the dams during the occurrence of the test flood and the reported overtopping of the dams during prior floods. There is some eroding of concrete joints in the dam, deteriorated concrete on appurtenant structures and observed seepage both from the joints in the concrete and from the embankments. The east dike is heavily overgrown with brush and young trees. Hydraulic analysis indicates that the test flood stage would be at elevation 240.3 which is approximately 4.3 feet above the top of the right embankment. Approximately 95 percent of the test flood would pass over the 60 foot dam, 29 foot dam and the small dam spillways. The remaining flow would be over the right embankment between the screen house and the mill building.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
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Book Description
West Parish Filter No. 3 Dam is an earthen embankment structure 37.5 feet high and 800 feet long. A side-channel spillway is located at the right abutment. It has a concrete overflow section which is 23.4 feet long. Outlet piping passes beneath the embankment and connects directly to the water treatment plant which serves the City of Springfield, Mass. The dam is situated on a very small (0.07 sq. mi) drainage area, and serves as offstream storage and as a sedimentation basin for water which is piped from other dams. Based on the visual inspection, the dam is judged to be in fair condition. The following deficiencies were observed at the dam: a soft, wet area near the downstream toe; a row of evergreen trees along the downstream toe with some roots penetrating the embankment; rodent holes on the downstream slope; wheel tracks on the crest of the dam; misaligned riprap and loose rock and trees overhanging the spillway; low areas on the top of the dam; and no means of controlling flow at the upstream end of the outlet conduit. The spillway capacity is about 335 percent of the routed test flood outflow of 142 cfs. During the test flood, the freeboard would be 1.9 feet.
