Which bank effect pulls the hull toward the bank?

Which bank effect pulls the hull toward the bank?

• A. Bank suction
• B. Bank cushion
• C. Bank tilt
• D. Water current

Answer: (A)

Bank suction occurs when a vessel is near a bank in shallow water. The water between the hull and the bank is forced through a narrowing gap, so it must move faster. Faster flow lowers the pressure in that narrow channel, creating a suction that pulls the hull toward the bank. On the opposite side, the water isn’t as constricted, so pressure remains higher and can push the hull away from the bank—this is the bank cushion effect. Water current refers to general movement of water and doesn’t describe this pressure interaction between hull and bank, and bank tilt isn’t the standard term used for this phenomenon. So the effect that pulls the hull toward the bank is bank suction.

Bank suction occurs when a vessel is near a bank in shallow water. The water between the hull and the bank is forced through a narrowing gap, so it must move faster. Faster flow lowers the pressure in that narrow channel, creating a suction that pulls the hull toward the bank. On the opposite side, the water isn’t as constricted, so pressure remains higher and can push the hull away from the bank—this is the bank cushion effect. Water current refers to general movement of water and doesn’t describe this pressure interaction between hull and bank, and bank tilt isn’t the standard term used for this phenomenon. So the effect that pulls the hull toward the bank is bank suction.