Manoeuvring large ships at close quarters and on shallow water is one of the most difficult aspects of shiphandling because of the complex hydraulic interactions depending on the ships' speeds, on the water depth and on lateral restrictions like in canals. Training is conducted both on meeting and on overtaking ships in shallow waters. This video shows how overtaking in a canal can easily fail.
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NTSB issued an investigation report on the contact of tow William C with a Rock Island railroad bridge protection cell, on Des Plaines River, in January 2020. The investigation established that high speed prevented the pilot to correct the tow’s position after completing the transit through the previous bridge.
