Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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
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.
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
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.
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
1979
79 pages
Report
Keine Angabe
Englisch