Download or read book National Program for Inspection of Non Federal Dams Greenville Dam CT 00206 Thames River Basin Norwich 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 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Greenville Dam is a long stone-filled timber crib spillway structure with two earth embankments with vertical stone masonry facing forming the spillway abutments. The total length of the dam is 664 feet including the 400 feet timber crib spillway. The outlet works for the dam is a series of 6-10 ft. W x 10 ft. H gates leading to a downstream canal used for generating power at a downstream facility. This dam has a maximum height of 29.0 feet and was originally build in the year 1982. The dam was judged to be in FAIR condition. However, because the river stage at the time of the visual inspection was high, the assessment of the dam is based only on those visible portions that could be readily inspected. Those components were the abutment embankments and the outlet structure. The spillway could not be evaluated. Several items require attention to insure the long term performance of the dam. They include: seepage at the left embankment, erosion at the toe of the left embankment, brush growth of the upstream face of the right embankment. Construction work at the left embankment has resulted in the temporary creation of a low area in that embankment crest. The routed Test Flood outflow for this dam is equal to the Probable Maximum Flood (PMF) or approximately 140,000 CFS and would overtop the dam by 6.2 feet. The maximum spillway discharge of 84,480 CFS represents 60 percent of the test flood outflow.

Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Program for Inspection of Non Federal Dams Tafville Reservoir Number 2 Dam CT 00201 Thames River Basin Norwich 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 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Taftville Reservoir No. 2 Dam is a zoned embankment about 667 ft. long with a concrete core wall, is 16 ft. wide at the crest, and has a maximum height of about 30 ft. It has a combined drop inlet spillway and outlet tower structure. The outfall from the drop inlet is a 16 in. dia. pipe and the outlet pipe is a 12 in. dia. A trapezoidal notch in the crest of the dam serves as an auxiliary spillway. Maximum storage capacity of the reservoir is 110 acre-feet and the drainage area is 69 acres. The dam appears to be in good condition. The crest and downstream slope are covered with brush growth and there is some local displacement of rock fill and riprap. The outlet tower structure has been subject to vandalism, including demolition and removal of the concrete block tower house. Previous inspection reports noted seepage at the toe of the embankment near the 16 in. dia. spillway outfall pipe, but with the reservoir empty no seepage was evident on the date of this inspection. The drop inlet and auxiliary spillways are together adequate to pass the selected test flood of 1/2 PMF without overtopping the dam.

Download or read book National Program for Inspection of Non Federal Dams Thames River Basin Norwich Connecticut Spaulding Pond Dam CT 00202 Spaulding Pond Dike CT 01685 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 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book National Program for Inspection of Non Federal Dams Shenipsit Dam CT 00482 Thames River Basin Stafford 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 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1984-10 with total page 1112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Program for Inspection of Non Federal Dams Versailles Pond Dam CT 00472 Thames River Basin Sprague 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 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book National Program for Inspection of Non Federal Dams Fairview Reservoir Dam CT 00205 Thames River Basin Norwich 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 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fairview Reservoir Dam is an earth dam with a masonry core wall constructed around 1868 and is used today as a standby water supply for the city of Norwich. The dam has a maximum height of 28.0 feet and is approximately 520.0 feet long, with a top width of 27.0 feet. There are four auxiliary dikes at the north end of the reservoir; all four dikes are earth embankments of the same construction and similar to the main dam. The outlet spillway is located in the Northwest Dike and is 27.0 feet long. The dam is considered to be in FAIR condition. Several visible signs of distress which indicate potential hazards are: seepage at two spots at the downstream toe of the dam, seepage through the roof of the valve chamber, rotting stumps on the main embankment, trees and shrubs on the downstream face of the main dam and both faces of all the dikes, structural deterioration of and seepage from under the spillway, rusted outlet conduits at the valve chamber with valves frozen in the open position allowing constant pressurized outlet pipes to pass through the embankment, and a general lack of regular maintenance. The maximum spillway discharge is 648 cfs, or abut 48 percent of the test flood outflow.

Download or read book National Program for Inspection of Non Federal Dams Deep River Reservoir Dam CT 00346 Thames River Basin Colchester 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 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dam at Deep River Reservoir is a zoned earth embankment approximately 900 feet long, 62 feet high with an average crest width of 20 feet. It was originally constructed in 1926, 7 and raised in 1971, 2 to its present configuration. It is owned by the City of Norwich, Connecticut and operated by the Department of Public Utilities as the main surface water supply of the City. The dam has an agee overflow spillway at the right abutment. The spillway is a converging chute type with a drop to a stilling basin at the toe of the dam. The outlet works and control tower are centered on the embankment and discharges from the tower's wet well flow through a reinforced 42 inch diameter condiut beneath the dam. An earth embankment dike 240 feet long in an adjacent cove of the reservoir contains an erodable fuse plug emergency spillway. As a result of the visual inspection and the review of available data regarding this facility, the dam is considered to be in GOOD condition. To assure the long-term performance of this structure, several items of concern require attention: modifications need to be made to the existing relief well monitoring system in order to more accurately record the seepage flow, a localized erosion immediately upstream of the left abutment of the dam must be repaired, and vegetable growth in the downstream channel of the emergency spillway should be removed. The maximum outflow capacity of the spillway under a stillwater condition is equal to 18,860 CFS which represents more than 100 percent of the test flood.

Download or read book National Program for Inspection of Non Federal Dams Mono Pond Dam CT 00258 Thames River Basin Columbia 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 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book National Program for Inspection of Non Federal Dams Yantic River Dam CT 00654 Thames River Basin Bozrah 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 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Yantic River Dam is an earth embankment with a gravity overflow section. They have a combined length of approximately 323 feet and a maximum height of 18.2 feet. A spillway is located on the northern side of the dam and is approximately 128 feet long. The concrete and masonry spillway is 4 feet lower than the top of the dam. A gate structure and sluiceway near the northern end of the dam supplies water to a downstream factory. There is a 24 inch low-level discharge pipe that passes through the base of the dam at the southern end of the spillway. The pipe is controlled by a gate on the upstream side of the dam and this gate is operable. The drainage area is 39.4 square miles and the reservoir has approximately 77 acre-feet of storage capacity. The assessment of the dam is based on available information, visual inspection 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 earth embankment and the northern spillway training wall, settlement behind the spillway training wall, cracking and spalling of the sluiceway gate structure and brush and trees on the embankments and along the toe of the dam. The spillway capacity at the top of dam is 2,700 cfs or 44 percent of the test flood outflow. The test flood outflow will overtop the dam by approximately 2 feet.

Download or read book National Program for Inspection of Non Federal Dams Pachaug Pond Dam CT 00663 Thames River Basin Griswold 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: 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.

Download or read book National Program for Inspection of Non Federal Dams Trading Cove Pond Dam CT 00237 Lower Thames River Basin Norwich 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 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trading Cove Dam is an earth embankment dam with vertical masonry walls along the upstream crest. The dam is 230 feet long and 29 feet high as measured above the stream bed. The spillway, which is located near the approximate center of the dam, discharges its flow directly into a culvert which passes through the dam. The outlet works, located near the left abutment of the dam, consists of a square concrete opening from which the grate has been removed. There is no controlling gate mechanisms for this outlet and its discharge point on the downstream slope of the dam has been blocked by riprap. As a result of the visual inspection and hydrologic and hydraulic computations, the dam is considered to be in FAIR condition. To assure the long term performance of this structure, a few items of concern require attention. The erosion of the downstream slope near the spillway walls must be repaired, tree and brush growth on both slopes must be cleared, the upstream wall should be regrouted and a trash rack and gate mechanism should be installed at the outlet structure. The maximum outflow capacity of the spillway before over-topping occurs is 2,300 cfs, which represents approximately 51 percent of the test flood outflow.

Download or read book National Program for Inspection of Non Federal Dams Whitney Dam CT 00477 Thames River Basin Stafford 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 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book National Program for Inspection of Non Federal Dams Papermill Pond Dam CT 00471 Thames River Basin Sprague 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 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book National Program for Inspection of Non Federal Dams Abbott Dam CT 00582 Thames River Basin Pomfret 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 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abbott Dam consists of an earth embankment 440 feet long, 33.5 feet high, with a crest width of 14 feet. Both the upstream and downstream slopes are grass-covered but otherwise unprotected. The facility has two spillways. The normal spillway consists of a vertical drop inlet structure which connects with the outlet conduit through the dam embankment. The emergency spillway is a trapezoidal channel, 40 feet wide at the base, which excavated in natural ground. The facility has one gate valve for the purpose of lowering the pond level, however, this valve was inoperable at the time of the inspection. The assessment of the facility is based on the visual inspection, since only limited engineering, operational, and maintenance data are available. The dam is judged to be in FAIR condition with several maintenance items that require attention to insure the long term performance of the items that require attention to insure the long term performance of the structure. These items include: erosion of embankment due to wash and turbulence at the outlet, seepage from the abutment areas, vibration of the outlet conduit caused by the turbulent outflow from the conduit and the inoperable gate valve. The dam has sufficient outflow capacity to prevent overtopping of the embankment by the test flood. The combined discharge capacity of both the drop inlet spillway and the emergency spillway is 1192 CFS which represents 277 percent of the test flood outflow. The capacity of the emergency spillway represents approximately 95 percent of the total discharge capacity of the dam.

Download or read book National Program for Inspection of Non Federal Dams North Grosvenordale Pond Dam CT 00183 Thames River Basin Thompson 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 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.