National Program for Inspection of Non-Federal Dams. Lake Dawson Dam (CT 00319), Connecticut Coastal Basin, Woodbridge, Connecticut. Phase I Inspection Report PDF Download
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Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
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ISBN:
Category :
Languages : en
Pages : 129
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This earth embankment dam is approximately 960 feet long and rises approximately 48 feet above the downstream bed of the West River. A concrete corewall apparently runs the length of the dam. The concrete spillway at the left end of the dam is a 110 foot long broad crested weir with a vertical-sided concrete channel leading to a steep-sided channel cut into natural ground. An upstream gatehouse near the right end of the dam houses the regulating outlets which consist of 2-36 inch cast iron low level outlets, a 36 inch supply main to the treatment plant immediately downstream of the dam, and an 8 inch well drain. Based upon the visual inspection at the site and past performance, the dam appears to be in good condition. No evidence of instability was observed in the embankment, spillway, spillway channel, or other appurtenances. Based upon the size (Intermediate) and hazard classification (High) of the dam in accordance with Corps of Engineers Guidelines, the test flood will be equivalent to the Probable Maximum Flood (PMF). Peak inflow to the reservoir is 20,100 cfs; peak outflow is 19,000 cfs with the dam overtopped 1.7 feet. Based upon our hydraulic computations, the spillway capacity is 9900 cfs, which is equivalent to 52 percent of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 129
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Book Description
This earth embankment dam is approximately 960 feet long and rises approximately 48 feet above the downstream bed of the West River. A concrete corewall apparently runs the length of the dam. The concrete spillway at the left end of the dam is a 110 foot long broad crested weir with a vertical-sided concrete channel leading to a steep-sided channel cut into natural ground. An upstream gatehouse near the right end of the dam houses the regulating outlets which consist of 2-36 inch cast iron low level outlets, a 36 inch supply main to the treatment plant immediately downstream of the dam, and an 8 inch well drain. Based upon the visual inspection at the site and past performance, the dam appears to be in good condition. No evidence of instability was observed in the embankment, spillway, spillway channel, or other appurtenances. Based upon the size (Intermediate) and hazard classification (High) of the dam in accordance with Corps of Engineers Guidelines, the test flood will be equivalent to the Probable Maximum Flood (PMF). Peak inflow to the reservoir is 20,100 cfs; peak outflow is 19,000 cfs with the dam overtopped 1.7 feet. Based upon our hydraulic computations, the spillway capacity is 9900 cfs, which is equivalent to 52 percent 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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The 380 foot long dam is a concrete gravity section rising approximately 62 feet above the bed of the Sargent River. The dam is founded on bedrock with the deepest foundation extending to 75 feet below the top of the dam. The spillway at the right end of the dam, is a concrete ogee section 40 feet in width, with 9 feet of freeboard from the crest of the spillway to the top of the dam. The outlets, regulated by a gatehouse on the upstream face of the dam, consist of a 24 inch supply main to the filtration plant downstream of Lake Dawson, a 30 inch low level outlet, and a 10 inch intake well drain, both of which discharge to the natural streambed near the center of the dam. Based on the visual inspection at the site and past performance, the dam appears to be in good condition. No evidence of instability was observed in the dam or its appurtenances. Based on our hydraulic computations, the spillway capacity is 4,100 cfs, which is equivalent to approximately 50% of the routed test flood outflow.
Author:
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Category : Science
Languages : en
Pages : 1016
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Author:
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ISBN:
Category : Research
Languages : en
Pages : 1138
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Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 131
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The Lake Naraneka Dam, constructed in 1937 for recreational purposes, is a 156-foot-long and 18-foot-high concrete gravity dam which is arched in plan. The dam is 4 feet wide at the crest; has a 0.1H:1V sloped upstream face; and a downstream face which is inclined at approximately 0.65 H:1V. The spillway is incorporated into the left side of the dam. The 11-foot-long spillway, located about 30 feet from the left abutment, discharges into a 60-foot-long stone paved channel. Discharge from the site may also pass through the manually controlled 14-inch diameter low level outlet of the 2-inch and 8-inch diameter conduits that supply and drain the small masonry pool at the downstream toe of the dam. The visual inspection of the dam indicated that the structure is in fair condition. Seepage and wet areas were observed on the downstream face of the dam. Extensive efflorescence, cracking and spalling of the concrete was noted at many areas on top, upstream, and downstream faces of the dam. The Lake Naraneka Dam has a top of dam storage capacity of 675 acre-feet (ac-ft) and is approximately 18 feet in height. The capacity of the spillway, with the water surface at the top of the dam, is 215 cfs or 43 percent of the routed test flood outflow. As a result, the dam will be overtopped by 0.7 feet.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 104
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The 250-foot-long, 21-foot-high homogeneous earthfill embankment is 12 feet wide at the top and has 3:1 upstream and downstream slopes. Riprap has been provided on the upstream slope to an elevation 2 feet above the wildlife pool surface. The principal spillway is composed of a reinforced concrete drop inlet structure and a 30-inch-diameter conduit through the dam. The crest of the drop inlet riser is at elevation 577.0 NGVD and has a total crest length of 15 feet. There is an ungated low-level outlet on the upstream wall of the riser. This 1 ft. - 10 in. by 1 ft. - 4 in. outlet has an open intake which may be closed, using stoplogs, thus diverting the flow over the weirs on the sides of the intake. The rock cut emergency spillway on the right abutment is 15 feet wide and approximately 245 feet long with a crest elevation of 578.0. The visual inspection of the dam indicated that the structure is in good condition. No indications of seepage through the dam were noted nor was seepage observed at the abutments or along the concrete spillway outlet pipe. There was no discharge from the 6-inch-diameter toe drain outlets during the inspection. The test flood outflow is approximately 1,240 cfs; and the combined capacity of the spillways, with the water surface at the top of the dam, is 1,600 cfs or 129 percent of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 91
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The dam is an earthfill structure with an upstream masonry and concrete retaining wall. The top of the dam is approximately 80 feet in width at the spillway and 20 feet above the streambed of the Farm River Diversion. The top of the dam is approximately 100 feet long along the upstream edge of the crest and approximately 200 feet long along the downstream edge of the crest. U.S. Route 1, a four lane highway, runs along the top of the dam. The spillway consists of a 10-foot-wide by 4.2-foot-high opening in the upstream masonry wall for the enclosed concrete ogee weir which feeds a 36 x 58-in. corrugated metal arch culvert through the embankment. The arch culvert connects to a junction box, as does the 24-inch low level outlet pipe, which runs from a concrete intake chamber 10 feet upstream of the upstream face of the dam. A 48-inch reinforced concrete pipe discharges from the junction box to the downstream streambed at the toe of the dam. 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 surface sloughing and erosion of the downstream embankment slope was noted. Peak inflow to the reservoir is 7450 cfs; peak outflow is 1900 cfs with the dam overtopped 1.9 feet. Based on our hydraulic computations, the spillway capacity is 220 cfs, which is equivalent to 12% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 77
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This 26 foot high water supply facility dam consists of two main sections. The upstream section is an earthfill dam built in 1862. The downstream part, built in 1900, is a stone masonry gravity section. The area between the two sections was filled in 1900 with a well-compacted clayey soil adjacent to the older upstream fill material. The spillway is a 21.5' foot long broad-crested stone masonry weir discharging to a concrete and stone channel which leads to a concrete arch culvert under Connecticut Route 34 immediately downstream of the dam. The outlets consist of a 16 inch supply main and a 10 inch low level outlet, both of which are gated on the downstream side of the dam, the 16 inch pipe at a gatehouse at the toe of the dam, and the 10 inch by a gate in a manhole at the toe of the dam. In addition there is a 20 inch pipe through the dam which carriers water from the upper Maltby Lake No. 2 to the downstream gatehouse. From the gatehouse, a water line runs to the filtration plant on the opposite side (southeast) of Route 34. Based upon the visual inspection at the site and past performance, the dam appears to be in good condition. No evidence of instability was observed in the downstream masonry section, the upstream earthfill section, or any appurtenances. The test flood is equivalent to one-half the Probable Maximum Flood (PMF). Peak inflow to the reservoir is 1450 cfs; peak outflow is 1220 cfs with the dam overtopped 0.6 feet. Based upon our hydraulic computations, the spillway capacity is 520 cfs without the swale overflow, which is equivalent to 43% of the routed test flood outflow.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 94
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Pataguanset Lake Dam is a 210 foot long earthfill and stone masonry structure. The left half of the dam is an earth embankment with a 10 foot crest width and a crest elevation of 68.0 NGVD. The center section of the dam is an earthfill emergency spillway with sheet piling on the upstream face and a 20 foot wide concrete paved crest. The crest elevation of this section is 65.2 NGVD. The spillway is a broadcrested weir, 15 feet long, with a crest elevation 62.7 NGVD. The outlet consists of a 6 foot wide rectangular concrete channel with stop log controls and an invert of 60.2 NGVD. The maximum height of the dam is 11.6 feet. The dam has a maximum impoundment capacity of 950 acre-feet at the top of dam elevation of 68.0 NGVD and used for recreation. The test flood has a routed outflow discharge equal to 1,800 CFS and would overtop the dam by 0.3 feet. The maximum spillway outlet, and emergency spillway capacity is equal to 1,580 CFS which represents 88% of the test flood outflow. Based on a visual inspection at the site, the dam is considered to be in FAIR condition. It is recommended that the left training wall of the outlet channel be repaired or replaced immediately upon receipt of this report.
Author: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV.
Publisher:
ISBN:
Category :
Languages : en
Pages : 75
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Guilford Lakes Upper dam is a 200 foot long earthfill structure. The earth embankment has vertical walls on the upstream and downstream faces, and has a crest width of 26 feet. The upstream face is a grouted masonry wall and the downstream face is dry masonry. The dam has two adjacent spillways, a low level outlet, and an emergency overflow. Based on a visual inspection at the site, the dam is considered to be in FAIR condition. However, there are several areas of concern which must be corrected to assure the long-term performance of this dam. It is recommended that the owner engage the services of a registered engineer experienced in the design of dams to accomplish the following: (1) Perform a detail hydrologic/hydraulic investigation to assess further the need for and the means to increase project discharge capacity and the ability of the dam to withstand overtopping; (2) Recommend methods to repair or seal the crushed left overflow pipe; (3) Provide procedures for removal of brush, trees, and root systems to a distance of 15 ft downstream from the dam, and select soils to refill any resulting holes. The maximum spillways and emergency overflow capacity is equal to 635 CFS, which represents 14% of the test flood outflow.
