Download or read book National Dam Inspection Program Upper Rock Creek Watershed Site Number 1 Potomac River Basin Lake Bernard Frank Montgomery County Maryland NDI Number MD 0050 Phase I Inspection Report written by CORPS OF ENGINEERS BALTIMORE MD BALTIMORE DISTRICT. and published by . This book was released on 1979 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dam at Upper Rock Creek Site No. 1, known locally as Lake Bernard Frank, consists of a compacted zoned earth fill embankment approximately 78 feet high and 576 feet long. The grassed slopes rise at 3H:1V upstream and downstream. A 20 foot berm is located on the upstream slope one foot below normal pool at elevation 297.0. Rock riprap extends from elevation 297.0 to elevation 302.0. The principal spillway riser concrete control towers connects to a 42-inch concrete outlet pipe which discharges to an impact basin. These facilities discharge uncontrolled normal flows up to the calculated 100 year frequency flood event and cold water releases through three gated inlets. Flood flows exceeding the calculated 100 year flood levels may be discharged through a trapezoidal grassed emergency spillway located beyond the left abutment. The emergency spillway crest is 36.5 feet above the normal pool elevation and 13.4 feet below the top of dam elevation. Based on the evaluation of the conditions as they existed on the date of the inspection and as revealed by visual observations, the condition of the dam is assessed to be good. The spillway capacity is classified as adequate because it will pass the recommended spillway design flood of full Probable Maximum Flood according to the recommended criteria.
Download or read book National Dam Inspection Program Upper Rock Creek Watershed Site Number 5 Lake Needwood NDI Number MD 00046 Potomac River Basin Rock Creek Montgomery County Maryland Phase I Inspection Report written by CORPS OF ENGINEERS BALTIMORE MD BALTIMORE DISTRICT. and published by . This book was released on 1979 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dam at Upper Rock Creek Site No. 5, known locally as Lake Needwood, consists of a compacted zoned earth fill embankment approximately 65 feet high and 426 feet long. The grassed slopes rise at 3H:1V upstream and downstream. A 12 foot berm is located on the upstream slope one foot below normal pool at elevation 322.5. Rock riprap extends from this level to elevation of 327.5. The principal spillway riser concrete control towers connects to a 42-inch concrete outlet pipe which discharges to an excavated stilling basin. These facilities discharge uncontrolled normal and cold water releases through three gated inlets. Flood flows exceeding the calculated 100 year flood levels may be discharged through a trapezoidal grassed emergency spillway located beyond the left abutment. The emergency spillway crest is 27.5 feet above the normal pool elevation and 12.6 feet below the top of dam elevation. Based on the evaluation of the conditions as they existed on the date of the inspection and as revealed by visual observations, the condition of the dam is assessed to be good. The spillway capacity is classified as adequate because it will pass the recommended spillway design flood of full Probable Maximum Flood according to the recommended criteria.
Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1980 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1981 with total page 1052 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1981 with total page 942 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book National Dam Inspection Program St Mary s River Watershed Site Number 1 NDI ID Number MD 28 Potomac River Basin Western Branch of St Mary s River St Mary s County Maryland Phase I Inspection Report written by Edward J. Zeigler and published by . This book was released on 1980 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: St. Mary's River Watershed, Site No. 1, completed in 1975, is a zoned earth fill embankment with an impervious core, a cutoff trench, and a toe drain. The embankment is 38 feet high at its maximum section and is approximately 1670 feet long. The flood discharge facilities for the dam consist of the principal spillway comprised of a drop inlet spillway and two manually operated sluice gates located in the spillway riser structure, and a 300 foot wide emergency spillway located adjacent to the right abutment of the dam. According to the hydrologic and hydraulic analyses, the St. Mary's River Watershed, Site No. 1 dam will pass 100 percent of the Probable Maximum Flood without overtopping, and therefore its spillway is rated adequate.
Download or read book National Dam Inspection Program Lake Whetstone NDI ID Number MD 53 Potomac River Basin Whetstone Run Montgomery County Maryland Phase I Inspection Report written by Edward J. Zeigler and published by . This book was released on 1980 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the visual inspection, available records, past operational performance, and in accordance with the guideline criteria established for these studies, Lake Whetstone is judged to be in good condition. The water level in Lake Whetstone is normally maintained at elevation 362 by way of a rectangular concrete drop inlet spillway. Sources of inflow to the lake include Whetstone Run inflow, storm drainage, surface water runoff, and rainfall on the lake surface. No stability problems were evident for the embankment at the time of the visual inspection. (Author).
Download or read book National Dam Inspection Program Contee Main Settling Pond Dam NDI I D Number MD 81 Potomac River Basin Indian Creek Prince Georges County Maryland Phase I Inspection Report written by and published by . This book was released on 1981 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of a Phase I investigation is to identify expeditiously those dams which may pose hazards to human life or property. The assessment of the general condition of the dam is based upon visual observations and review of available data. Detailed investigations and analyses involving topographic mapping, subsurface investigations, materials testing, and detailed computational evaluations are beyond the scope of a Phase I investigation; however, the investigation is intended to identify the need for such studies which should be performed by the owner. In reviewing this report, it should be realized that the reported condition of the dam is based on observations of field conditions at the time of inspection along with data available to the inspection team. In cases where the reservoir was lowered or drained prior to inspection, such action, while improving the stability and safety of the dam, removes the normal load on the structure and may obscure certain conditions which might otherwise be detected if inspected under the normal operating environment of the structure.
Download or read book National Dam Inspection Program Trinity Church Dam Gilbert Run Watershed Site Number 1 NDI ID Number MD 37 Potomac River Basin Gilbert Run Charles County Maryland Phase I Inspection Report written by ACKENHEIL AND ASSOCIATES BALTIMORE MD. and published by . This book was released on 1979 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trinity Church Dam was constructed as a zoned earthfill structure. The dam is approximately 1,690 ft. in length, has a maximum toe to crest height of 40 ft., and a crest width of 15 ft. Upstream and downstream slopes have inclinations of 3H:1V and 2.5H:1V, respectively. A 10 ft. wide bench is located on the upstream slope at normal pool level (El. 75.0). According to as-built drawings seepage control provisions include a 1,500 ft. long cutoff trench constructed near the toe of the upstream slope and a 1,360 ft. long filter trench located approximately 70 ft. downstream from the dam crest. Seepage, intercepted by the filter trench, is diverted to the outlet pipe plunge pool by means of perforated corrugated metal pipes and a blanket drain.
Download or read book National Dam Inspection Program Lake Linganore NDI ID Number MD 21 Potomac River Basin Linganore Creek Frederick County Maryland Phase I Inspection Report written by Edward J. Zeigler and published by . This book was released on 1980 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Lake Linganore Dam consists of an earth embankment approximately 750 feet long and 62.5 feet high at is maximum section. The crest of the dam has a minimum crest width of 12 feet. The flood discharge facilities for the dam include a 48-inch diameter diversion pipe and sluice gate vault, and a 122 foot wide ogee crest spillway. According to the hydrologic and hydraulic analyses, Lake Linganore Dam will overtop by 0.6 foot for a duration of 4 hours during a flood equalling 50% of the Probable Maximum Flood (PMF). The analyses indicate that the Lake Linganore Dam spillway can pass approximately 48% of the PMF without overtopping the dam.
Download or read book Potomac River Basin Fishing Creek Dam State of Maryland Frederick County written by United States. Army. Corps of Engineers. Baltimore District and published by . This book was released on 1978 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book National Dam Inspection Program Greenbrier State Park Dam Dike NDI Number MD 00042 Potomac River Basin Little Beaver Creek Washington County Maryland Phase I Inspection Report written by CORPS OF ENGINEERS BALTIMORE MD BALTIMORE DISTRICT. and published by . This book was released on 1979 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Greenbrier State Park Dam consists of an earth fill embankment approximately 64 feet high and 445 feet long. The principal spillway has a crest elevation of 151.5 feet or 8.1 feet below the top of the dam which is at an elevation 159.6. The principal spillway is a two stage rectangular reinforced concrete intake structure which connects to a 36 inch concrete water pipe that exits at elevation 97.0 into a stilling basin. A drawdown system that ties into the bottom of the rectangular intake at elevation 101.0 extends under the reservoir 149 feet to a perforated 36 inch B.C.C.M.P. 12 feet high. At the northeast side of the lake, an earthen dike 560 feet long and 10 feet high was constructed to retain flood pools. The 145 foot wide emergency spillway is located on the right abutment of the dike at an elevation of 153.5. Based upon the evaluation of the conditions as they existed on the date of the inspection and as revealed by visual observations, the condition of Greenbrier State Park Dam and Dike is assessed to be good. The spillway capacity, based upon the designed geometry, is assessed to be adequate because it safely passes full Probable Maximum Flood. However, additional hydraulic studies are warranted based upon the existing use of the emergency spillway as an access roadway and boat launching facility.
Download or read book National Dam Inspection Program Wheatley Dam Gilbert Run Watershed Site Number 2 NDI ID Number MD 60 Potomac River Basin Gilbert Run Charles County Maryland Phase I Inspection Report written by ACKENHEIL AND ASSOCIATES BALTIMORE MD. and published by . This book was released on 1979 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wheatley Dam was constructed as a zoned earthfill structure. The embankment contains a thin inclined impervious core constructed of compacted silty clay material. The dam is approximately 1,000 ft. long and has a maximum toe to crest height of 39 ft. Upstream and downstream embankment slopes have inclinations of 3H:1V and 2.5H:1V, respectively. A riprap layer for wave protection has been placed on the upstream slope at normal pool level from E1. 92.5 to E1. 98.0 (3 ft. above normal pool level). Seepage control provisions include a cutoff trench and a seepage drain, respectively located 24 ft. upstream and 58 ft. downstream of the dam centerline. Both cutoff trench and seepage drain run the entire length of the dam. Three (3) blanket drains and two (2) perforated corrugated metal pipes discharge seepage collected by the seepage drain at the downstream embankment toe.
Download or read book National Dam Inspection Program Fishing Creek Dam NDS MD 16 Potomac River Basin Frederick County State of Maryland Phase I Inspection Report written by BERGER ASSOCIATES INC HARRISBURG PA. and published by . This book was released on 1978 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Dam Inspection Act, Public Law 92-237 authorized the Secretary of the Army, through the Corps of Engineers, to initiate a program of inspections of dams throughout the United States. Phase I Inspection and Report is limited to a review of available data, a visual inspection of the dam site and the basic hydraulic calculations to determine the adequacy of the spillway. The purpose is to determine if the dam constitutes a hazard to human life and property.
Download or read book National Dam Inspection Program Jameson Dam NDI I D MD 38 Potomac River Basin Gilbert Run Charles County Maryland Phase I Inspection Report written by ACKENHEIL AND ASSOCIATES INC BALTIMORE MD. and published by . This book was released on 1979 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the evaluation of available design information and visual observations of conditions as they existed on the dates of the field reconnaissances, the general condition of Jameson Dam is considered to fair. Transported silt-sand soil was observed deposited in the area of the seepage blanket drain outlets. Due to the pipeable nature of the embankment soils, seepage discharge should be periodically observed to determine if embankment soils are being transported. The seepage flows are not considered to represent a significant hazard relative to the overall stability of the dam at the present time. Based on review of design documents and visual observations, there is concern the emergency spillway channel will undergo severe erosion when activated by large flood flows. A study to evaluate the erosion potential of the spillway channel should be implemented by the owner. The reservoir drain slide gate was found inoperable and is judged inadequate in its present condition. Appropriate maintenance and/or repairs should be performed as soon as possible. Jameson Dam is classified as an intermediate size, high hazard dam according to guideline criteria. Based on Soil Conservation Service hydrological/hydraulic design computations, spillway capacity was found adequate to pass 100 percent of the PMF. Therefore, spillway capacity is in accordance with recommended guideline criteria.
Download or read book National Dam Inspection Program Warner Gap Hollow Dam Edgemont Reservoir NDI MD 00006 Potomac River Basin Warner Gap Hollow Washington County Maryland Phase I Inspection Report written by Jeffrey O. Smith and published by . This book was released on 1979 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Warner Gap Hollow Dam, known locally as Edgemont Reservoir, consists of a zoned earth fill embankment approximately 65 feet high and 700 feet long. A puddle wall approximately 5 feet wide by 15 feet deep near the upstream toe is detailed on the design plans. The rip-rap covered slopes rise at 1 1/2H:1V downstream and 2H:1V upstream. The spillway is a rectangular concrete channel with the entrance located near the right abutment and discharging approximately parallel to the longitudinal axis of the embankment. The spillway crest is at elevation 901.0, approximately 4 feet below the dam crest.
Download or read book National Dam Inspection Program Broad Creek Dam NDI Number MD 00017 Susquehana River Basin Broad Creek Harford County Maryland Phase I Inspection Report written by CORPS OF ENGINEERS BALTIMORE MD BALTIMORE DISTRICT. and published by . This book was released on 1979 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Broad Creek Dam consists of an ogee shpaed concrete overflow spillway, 180 feet in length, with zoned earthen embankments 80 feet in length on the left side and 70 feet in length on the right side. The slope configuration is 2H to 1V, both upstream and downstream, and the maximum depth of fill is approximately 10 feet. A drain opening 4 feet by 4 feet, extends through the left side of the overflow section with the control structure and gate located on the downstream face. Based on the evaluation of the conditions as they existed on the date of the inspection and as revealed by visual observations, the condition of Broad Creek Dam is assessed to be good. The spillway capacity (50 percent PMF) is classified as inadequate because it will not pass the recommended spillway design flood of full Probable Maximum Flood (PMF) according to the recommended criteria. However, overtopping of the dam by PMF is judged not to cause a breach of sufficient magnitude to increase the loss of life downstream. Consequently, additional hydraulic studies and remedial work to increase spillway capacity are not necessary.
