Marc wrote:
Narrow water, shallow with steep banks.

a boat will push water with the bow which will build up a high
pressure or cushion which will force the bow away from the bank.

suction will happen at the stern which will pull the stern into the
bank.

result can be a sharp veer to the opposite bank.

If handled correctly, can also be a way of making a turn in the
river/channel, without the use of rudder.

otn