Leonardo da Vinci’s canal engineering included a canal lock system for controlling water levels. A lock allows boats to move between sections of water at different elevations by filling or emptying a chamber between gates.
Leonardo worked on canals in northern Italy, especially around Milan, where waterways supported transport, irrigation, and urban industry. His notebooks record studies of gates, channels, dams, and water flow. These projects connected theoretical observation with practical civil engineering.
A lock chamber has gates at its ends. A boat enters, the gates close, and water is added or released until the chamber matches the level of the next section. The boat can then continue without requiring the entire canal to have one uniform elevation.
Leonardo did not invent the general idea of canal locks from nothing; earlier water-control systems existed in Europe and Asia. His contribution was the refinement and detailed study of hydraulic structures, including improved gate arrangements associated with the Milanese canal network.