National Program of Inspection of Non-Federal Dams, Tennessee. Lever Lake Dam (Inventory Number TN 18708), Harpeth River Basin, Near Kingston Springs, Williamson County, Tennessee. Phase I Investigation Report PDF Download
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Author: William Culbert (Jr)
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Category :
Languages : en
Pages : 98
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The dam is a linear earthen structure 163 feet long and 26.4 feet high with a crest width of 11 feet. The upstream and downstream slopes are both 1.4H:1V. The surface area of the lake is 3.7 acres at normal pool and 5.8 acres at the top of the dam. The 104 acre drainage area of the reservoir is predominantly woodland and meadow with an average ground slope of approximately 14%. Reportedly, water seeps slowly through fissures in the natural ground into a 0.4 acre lake 200 feet right of Lever. This dam was built for the purpose of maintaining pressure on the seeps and thereby maintaining the pool level of the larger lake. OCE guidelines recommend that small, high hazard dams such as Lever pass the one-half Probable Maximum Flood (1/2 PMF) to the full PMF. Analysis reveals that the dam will be overtopped by 0.6 feet for 0.6 hours under the 1/2 PMF. The reservoir contains the 100-year frequency storm maintaining 3 feet of freeboard. The dam is given a condition classification of 'unsafe - nonemergency' because of its spillway limitations and because the steepness of its downstream slope constitutes a stability concern. It is recommended that a qualified engineer be retained to study the embankment stability and the hydraulic limitations of the spillway and make recommendations for their correction.
Author: William Culbert (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 98
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Book Description
The dam is a linear earthen structure 163 feet long and 26.4 feet high with a crest width of 11 feet. The upstream and downstream slopes are both 1.4H:1V. The surface area of the lake is 3.7 acres at normal pool and 5.8 acres at the top of the dam. The 104 acre drainage area of the reservoir is predominantly woodland and meadow with an average ground slope of approximately 14%. Reportedly, water seeps slowly through fissures in the natural ground into a 0.4 acre lake 200 feet right of Lever. This dam was built for the purpose of maintaining pressure on the seeps and thereby maintaining the pool level of the larger lake. OCE guidelines recommend that small, high hazard dams such as Lever pass the one-half Probable Maximum Flood (1/2 PMF) to the full PMF. Analysis reveals that the dam will be overtopped by 0.6 feet for 0.6 hours under the 1/2 PMF. The reservoir contains the 100-year frequency storm maintaining 3 feet of freeboard. The dam is given a condition classification of 'unsafe - nonemergency' because of its spillway limitations and because the steepness of its downstream slope constitutes a stability concern. It is recommended that a qualified engineer be retained to study the embankment stability and the hydraulic limitations of the spillway and make recommendations for their correction.
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Category : Dam safety
Languages : en
Pages : 0
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Category : Science
Languages : en
Pages : 856
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Category : Research
Languages : en
Pages : 1220
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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.
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Category : Government reports announcements & index
Languages : en
Pages : 1016
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Author: George E. Moore
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ISBN:
Category :
Languages : en
Pages : 106
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This report is based on the findings of a Phase I inspection of Crystal Lake Dam in Hardeman County. The zoned earthfill embankment is 27 feet high and 410 feet long with a crest width of 13 feet. The embankment slopes are 1V:4.3.1H downstream. The dam impounds 63-acre-feet at normal pool level with 36 acre-feet of flood storage. The dam is in the small size, high hazard potential category. Erosion on the downstream slope of the embankment and in the emergency spillway is becoming severe. Some indications of dispersive soils were noted. The reservoir has sufficient storage/spillway capacity to pass the 1/2 PMF overtops the dam by 0.1 feet for 24 hours. Crystal Lake Dam has been assigned a condition classification of 'deficient'.
Author: William E. Bush
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ISBN:
Category :
Languages : en
Pages : 76
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Nolan Dam has an 8.44 acre lake and is located in Shelby County, Tennessee, south of Winchester Road and east of Ross Road, and is an earth fill embankment 14.7 feet high and 640 feet long. The crest varies from 9 feet to 12 feet in width. Facilities for discharge from the reservoir are located in the east abutment and include an inlet section with a bottom width of eight feet and vertical broken concrete masonary walls two feet high. The emergency spillway is crossed by a farm road approximately 50 feet from the entrance and the fill contains four 18 inch corrugated metal pipes protected by a concrete headwall on both sides of the road. A four inch cast iron draw down pipe with a gate valve at the discharge end is located at approximately the center of the dam. The embankment slopes are approximately 1V on 3H on 2.3H to the top of the dam on the upstream slope. Neither slope has undesirable vegetation. A broken concrete masonry wall provides the vertical section of the upstream slope. Nolan Dam is in the small size category and has a downstream hazard potential classification of high by the Corps of Engineers and I by the State of Tennessee.
Author: William E. Bush
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ISBN:
Category :
Languages : en
Pages : 115
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Portland City Lake Dam has an 35.5 acre lake and is located in Sumner County, Tennessee 2.5 miles northeast of Portland, Tennessee and is an earth fill embankment 32.8 feet high and 600 feet long. The crest width is 20 feet. Facilities for discharge from the reservoir are a low level outlet consisting of a 16 inch cast iron pipe through the dam with a valve on the outlet end and a water supply pipe of unknown diameter with a valve located in the lake. The emergency spillway is in the south abutment and consists of a concrete bottom 21 feet wide and layback concrete walls 4 feet high. The spillway is crossed by a road with four 48 inch concrete pipes set on top of the concrete chute to support the road. The embankment slopes are approximately 1V on 3H on the downstream slope and 1V on 3.1H on the upstream slope. Both slopes have undesirable vegetation. The emergency spillway has major problems which could lead to considerable damage including possible failure during a period of high flow in the spillway, also the spillway is inadequate to pass the 1/2 PMF (design flood) without overtopping the dam. Other problems include probable seep areas at the north abutment as the lake level approaches or exceeds normal pool elevations and the valve location on the drawdown pipe.
Author: George E. Moore
Publisher:
ISBN:
Category :
Languages : en
Pages : 223
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Based on the findings of a Phase I inspection of Spring Lake and Old Hickory Lake Dams in Hardeman County; Spring and Old Hickory Lake Dams are in series with each other and with Chancellor Dam upstream. The dams are of similar construction nad have the same owner. Spring Lake Dam is a zoned earthfill embankment 21.5 feet high and 400 feet long with a crest width of 12 feet. The side slopes are 3H;1V upstream and 3.7H:1V downstream. The service spillway is a concrete riser with two 1 ft x r openings leading to a 15 inch concrete pipe passing under the dam. The drawdown drain is a 15 inch diameter gate valve at the base of the riser. The emergency spillway is a trapezoidal earth saddle on the right abutment with an estimated capacity of 3500 cfs. Old Hickory Dam is a zoned earthfill embankment 20.5 feet high and 530 feet long with a crest width of 12 feet. The side slopes are 3.5H:1V upstream and 3.9H:1V downstream. The service spillway is a concrete riser with two 1 x 4 openings leading to a 24 inch concrete pipe passing under the dam. The draw-down drain is a 24 inch gate valve at the base of the riser. The emergency spillway is a trapezoidal earth saddle on the left abutment with an estimated capacity of 4670 cfs. Both dams are in the small size high hazard potential categories. Neither dam shows any overt signs of instability.
Author: Robert Ramsey
Publisher:
ISBN:
Category :
Languages : en
Pages : 83
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The earth dam is 15 ft. high, 675 ft. long, and has a crest width of 13 feet. It is in the small size and high hazard potential category. The dam impounds a 5.5 acre lake used for recreation and water supply. The embankment slopes are moderate and have a well established grass cover. Vehicles have cut deep ruts into the crest. The principal spillway is a 36 inch diameter CMP riser with a 30 inch diameter CMP outlet. A slide headgate is located at the base of the riser to regulate the lake level. The emergency spillway is a irregular shaped earth channel at the left abutment. The channel is relatively flat and in good condition. The dam is classified as 'significantly deficient' because the spillway will not safely pass the recommended one-half Probable Maximum Flood.
