Hydraulic Assistance on the Welland Ship Canal

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Abstract
Field studies at Lock No. 8 on the Welland Ship Canal show the effectiveness of hydraulic assistance in reducing the transit times of downbound vessels. A ship travelling in a restricted channel, such as a lock, displaces water in a direction opposite to ship movement; this reverse flow is accompanied by a drop in water level along the ship's hull. The ship will squat or settle in the water, therefore retarding its progress. The introduction of water at the upstream end of the lock reduces the back flow velocities and produces an increase in ship velocity thus reducing transit times.

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