sma said:

While not exactly correct, you can think of it this way; A displacement hull wants to ride at its normal waterline or displacement. When the hulls are dynamically pushing a bow wave it forms a trough. The hull still wants its waterline to match the water level next to the hull. It therefore has to sit "deeper" or closer to the bottom to achieve the same displacement. If the boat suddenly slows, the trough would collapse and the water rush in towards the "lower" gunwales.
Fortunately this is not a worry for beach cats.


That's a pretty good description of the forces in general associated with this event.

Lets move on Did ya hear the one about the .......