National Dam Inspection Program. Columbia LNG (NDI-ID Number MD-116), Chesapeake Bay, Wilbur Creek, Calvert County, Maryland. Phase I Inspection Report,
RUMMEL KELEPPER AND KAHL BALTIMORE MD
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The main and secondary dams of the Columbia LNG spoil embankments are earth fill dams constructed with compacted random fill. Each dam has a chimney drain and a slurry trench cutoff wall. The main dam is 74 feet high at its maximum section and is approximately 670 feet long. The main dam was constructed across Wilbur Creek. The secondary dam is 34 feet high at its maximum section and is approximately 230 feet long. Inflow into the main impoundment is either from surface runoff from the drainage area or from precipitation falling directly on the lake. The flood discharge facility for the main dam consists of the principal spillway which is a drop inlet the flood discharge facility for the secondary dam also consists of a drop inlet spillway. According to the hydrologic and hydraulic analyses, both the main and secondary dams will pass 100 percent of the Probable Maximum Flood without overtopping, and therefore the spillway of each dam is considered adequate.
- Civil Engineering