A broken water main flooded the Court Street subway station in Brooklyn Heights on Thursday afternoon just ahead of rush hour.
The ankle-deep water that poured down from Montague Street and into the station caused extensive delays and service changes to the R & Q trains, city officials said.
The city Department of Environmental Protection tracked the leak to a 12-inch pipe at 156 Montague St., which workers spent hours trying to repair.
R trains were running on the Q line from Canal Street to DeKalb Avenue in both directions. Commuters were advised to use the B26, B38 and B52 buses for alternate service.
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About 25 businesses in the area were without water until the repairs could be finished.