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Keywords: Emptying Lock 20 on C and O Canal.jpg en Emptying lock 20 boat going downstream on the Chesapeake and Ohio Canal Note that when they do this the short level between Locks 19 and 20 rises by about 6 inches After all that's about almost 90 000 gallons 12 000 cubic feet of water released when emptying one of these locks i e 100 feet long by 15 feet wide by 8 foot drop own Bonnachoven Chesapeake Ohio Canal National Historical Park Locks water transport Cc-zero |