Ivan Pavlov

It has long been known for sure that the sight of tasty food makes a hungry man's mouth water; also lack of appetite has always been regarded as an undesirable phenomenon, from which one might conclude that appetite is essentially linked with the process of digestion.

You probably have to have redundant levee systems with canals in between them, like the Dutch have, to make sure that incoming water is channeled off to areas where you deal with it rather than have it drown you.