Water in a board is never good. One method to get water out is to put the board in a cool, dark place on a warm day with the goal of lowering the board's temp. After the board cools, set it out in the sun on a warm/hot day. About every 20 minutes you will need to turn the board on its side to dump the excess water. When water is no llonger bubbling out of the board repeat the process but this time take a paper towel, twist the end and stick the twisted end into the vent plug. The paper towel will absorb the moisture.
You will never get all of the moisture out, but enough to prevent major damage. Alternate method is to have a shop do it. They will drill holes and attach vacume to vent then run vacume for a few days.