Leonardo da Vinci improved a sluice gate as a water-control mechanism using a movable gate.
A sluice controls water by raising or lowering a barrier in a channel. Leonardo studied canals, rivers, locks, and hydraulic machines in detail, and his notebooks include designs for gates and systems that could regulate water flow. These studies supported practical interests such as irrigation, navigation, drainage, and flood control.
Leonardo’s hydraulic work was connected to major canal projects in northern Italy, especially around Milan. He was interested not only in individual machines but also in how water moved through engineered landscapes. His drawings record observations of currents, turbulence, channels, and gate mechanisms.
A sluice gate is not the same as a canal lock. A gate regulates flow through an opening, while a lock uses chambers and multiple gates to raise or lower boats between water levels. Leonardo worked on ideas related to both types of infrastructure.