National Program for Inspection of Non-Federal Dams, Crystal Lake Dam (NH 00269), Connecticut River Basin, Enfield, New Hampshire. Phase I Inspection Report PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download National Program for Inspection of Non-Federal Dams, Crystal Lake Dam (NH 00269), Connecticut River Basin, Enfield, New Hampshire. Phase I Inspection Report PDF full book. Access full book title National Program for Inspection of Non-Federal Dams, Crystal Lake Dam (NH 00269), Connecticut River Basin, Enfield, New Hampshire. Phase I Inspection Report by CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.. Download full books in PDF and EPUB format.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 75
Get Book Here
Book Description
The dam is a 170 ft. long, 22 ft. high dam consisting of stone, earth, and concrete. The inspection did not disclose any findings that indicate an immediate unsafe condition. The general condition of the dam is good. The dam's spillway will not pass the required test flood. Many overhanging trees and two debris dams were noted in the downstream channel. (Author).
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 75
Get Book Here
Book Description
The dam is a 170 ft. long, 22 ft. high dam consisting of stone, earth, and concrete. The inspection did not disclose any findings that indicate an immediate unsafe condition. The general condition of the dam is good. The dam's spillway will not pass the required test flood. Many overhanging trees and two debris dams were noted in the downstream channel. (Author).
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
Get Book Here
Book Description
Crystal lake is an earthen embankment dam with a maximum height of 50 feet and a length of 130 feet. The upstream and downstream slopes are faced with riprap. The dam has a water control structure with a 36-inch diameter outlet pipe controlled by two sluice gates and a stop log spillway. The dam impounds Crystal lake which is used for recreational purposes. The lake has a storage volume of 350 acre-feet. Based upon the height of the dam, the size classification is intermediate. The dam is judged to be in generally fair condition. The crest is level, and no lateral movement was observed. The vertical and horizontal alignment of the dam is good. Some minor erosion along the dam adjacent to the left abutment was noted. The riprap paving on the upstream face is in good condition. The rockfill downstream face is also in good condition. Small trees and scrub brush are growing on the upstream and downstream slopes and could cause problems if not removed. The total capacity of the water control structure and the 36-inch diameter outlet pipe is adequate to pass the spillway test flood with a freeboard of 0.8 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 84
Get Book Here
Book Description
The dam is a 188 ft. long, 16 ft. high earth embankment dam. The condition is fair. The visual inspection did not disclose any immediate safety problems. The dam's spillway will not pass the test flood, therefore it is recommended that the owner engage a qualified engineer to evaluate further the potential for overtopping the inadequacy of the spillway. (Author).
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 71
Get Book Here
Book Description
The dam is an 80 ft. long, 12 ft. high dam consisting of stone, earth and concrete. The visual inspection did not disclose any findings that indicate an immediate unsafe condition. The general condition of the dam is good. The dam's spillway will not pass the required test flood. The wet area found at the toe downstream should be examined when there is no flow through the spillway to determine if it is resulting from seepage through the dam or from water through the rock slope from the spillway. (Author).
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 76
Get Book Here
Book Description
The dam is an earthfill embankment with a concrete and masonry spillway at the central part of the dam. A new highway embankment for Route 263 was constructed in 1976 just downstream from the dam. The old road is now used as an access to the dam lies just below the crest and extends along the dam from the right abutment to the spillway. The dam is approximately 520 feet long an 8 feet wide at the crest, which is 14 feet above the streambed of Sucker Brook. The spillway consists of a 45 foot long broad-crested concrete weir and a concrete apron which is just below the weir and enclosed by masonry training walls. This apron funnels the water into a 60 inch asphalt coated corrugated metal pipe through the new highway embankment. Based upon the visual inspection at the site and past performance, the dam is judged to be in fair condition. No evidence of structural instability was observed, however there are areas requiring attention such as seepage on the right toe of the dam, spalling of the spillway weir and wet areas and lime deposits on the masonry training walls. Peak inflow to the reservoir is 1250 cfs; peak outflow is 550 cfs with the dam overtopped 0.1 feet. The spillway capacity is 410 cfs., which is equivalent to 75% of the routed test flood outflow. The hydraulic/hydrologic calculations do include the effects of the Route 263 highway embankment and 60 inch culvert.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 93
Get Book Here
Book Description
The dam has a hydraulic height of 11 ft. and is about 150 ft. long. It is an earthen embankment contained between dry masonry walls; the upstream wall has been crudely faced with concrete. The dam is in poor condition. Among various major concerns are seepage at two of the four dikes and the large trees growing on the dikes. It is small in size with a significant hazard classification. (Author).
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 84
Get Book Here
Book Description
Crystal Lake Dam is an earthen embankment structure with a maximum height of 36 feet and a length of 230 feet. The centrally located stone masonry spillway is 50 feet wide. The broad crested weir has a series of stone steps which compromise the downstream face. The outlet works consist of an 18 inch diameter conduit which passes through the dam to the left of the spillway structure. Crystal Lake is used for passive recreation. The lake has a maximum storage volume of 63 acre-feet and the size classification is thus small. A breath of the dam could effect several homes and commercial establishments, along with Connecticut Route 4 and 272 which are in the probable impact area. With the possibility of some loss of life and the probability of excessive economic losses, the dam has been classified as having a high hazard potential. The dam is judged to be in generally fair condition. The crest of the dam has a slight undulation and is subjected to vehicular traffic. Some erosion of the downstream slope has occurred. No embankment or downstream seepage was noted. Large trees are growing along the downstream slope of the dam. The stone masonry spillway is in good condition. The capacity of the spillway is inadequate to pass the one-half PMF test flow outflow (3790 CFS) without overtopping the dam. The test flood would overtop the dam by about 1.6 feet. The spillway can pass about 51 percent of the test flood outflow without overtopping the dam.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 89
Get Book Here
Book Description
The dam is a dry rubble masonry dam with a concrete facing. It is about 78 ft. long with a maximum height to 34 ft. The overall condition of the dam is considered to be fair. At the time of the inspection the penstock opening has been sealed and the intake gate removed. It is intermediate in size with a significant hazard potential. The test flood would overtop the dam by 2.8 ft. There are various maintenance and operating measures which should be implemented.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 101
Get Book Here
Book Description
The dam is a 730 ft. long earth embankment with a hydraulic height of 22 ft. The dam is in fair condition. Apparent seepage problems and erosion of the upstream slope above the riprap are of principal concern. It is small in size with a significant hazard potential. A major breach at top of dam could result in the loss of 3-5 lives and excessive property damage. (Author).
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 105
Get Book Here
Book Description
The dam is an earth embankment structure with a continuous impervious earth core and cutoff trench. It is 960 ft. long with a maximum height of 32.5 ft. It is small in size with a low hazard potential. The dam is in fair condition. Seepage was observed in five specific locations along the downstream toe of the dam. (Author).
