🔍 Key Concepts

• Bank suction vs. bank cushion – how water flow behaves between the hull and the bank in a narrow channel • Effect of single-screw propeller wash and low-pressure areas along the hull • How the bow and stern each react when close to a bank in restricted waters

💭 Think About

• Picture the vessel moving ahead close to a steep bank: where does water have to speed up and where does it slow down? How does that affect pressure on each part of the hull? • Think separately about what happens to the bow (front) and the stern (back) as the vessel moves near the bank in a narrow channel. • Recall that "suction" refers to a low-pressure pull—which end of the vessel is more affected by that low-pressure area near the bank?:

✅ Before You Answer

• Distinguish between cushion (high pressure pushing off the bank) and suction (low pressure pulling toward the bank). • Decide which end of the vessel is more strongly affected by the suction effect when close to the bank in a narrow channel. • Make sure the option you select correctly identifies which part of the vessel (bow or stern) moves toward or away from the bank.