When a fine-bowed vessel glides through smooth blue water, the bow seems to cleave the water effortlessly, slicing a passageway through which to gracefully pass. To an extent, the eye does not deceive, but to one degree or another all vessels — finely shaped or otherwise — push, or displace, water to make way for the hull. They push it ahead, push it aside, push it down. Sometimes they push it up in the form of spray. Some boats push more water than others, depending on size, hull shape and speed.
On the open ocean, it doesn’t matter where this water goes, but in confined waterways it can interact with banks, bulkheads, bridge abutments, the bottom and the hulls of passing vessels in predictable and unpredictable ways.
Bank effect is…
