While I’m not too familiar with boats, I do know that many use sea water for cooling the engine(s) that water is most often dumped out low and towards the rear of the boat.
Secondly what you could be seeing is the bulge pump at work, there’s a space between the deck, where you stand or sit, and the hull that can get water in it and will need to drained or pumped out, many larger boat use this area to help keep the ship balanced while at sea.
As I said I not very familiar with boats operates, so If anyone else knows more, and can add or correct anything I might stated please do
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