Leonardo da Vinci designed canal locks to control water levels between sections.
A canal lock uses gates and a chamber to raise or lower boats between stretches of water at different elevations. Leonardo studied this problem while working on water-management projects in northern Italy, where canals supported transport, irrigation, and urban development.
His designs included carefully shaped gates and mechanisms for managing water flow. The work reflects Leonardo’s interest in hydraulics: he observed currents, planned channels, and sought ways to make navigation more reliable. Canal locks were not invented by Leonardo, but he improved and documented lock designs used in his time.
The term canal lock should not be confused with an aqueduct. An aqueduct carries water across an obstacle, while a lock changes a boat’s level within a navigable waterway. Leonardo’s hydraulic studies also included mills, pumps, and systems for moving water.