What was the main purpose of Leonardo da Vinci’s canal lock design?

The main purpose of Leonardo da Vinci’s canal lock design was to change water levels.

Leonardo studied canals and locks while working in northern Italy, where waterways were important for transport, irrigation, and connecting rivers with cities. His designs included gates and chambers that allowed boats to move between sections of canal with different water levels.

A lock works by enclosing a boat in a chamber, then raising or lowering the water until it matches the level of the next canal section. This avoids the need to build an entire waterway at one uniform elevation and makes navigation possible across changes in terrain.

Leonardo is sometimes credited with inventing the modern lock outright, but earlier locks existed in Europe and China. His contribution was to study, refine, and document hydraulic engineering with exceptional detail, including mechanisms for controlling gates and water flow.