Which type of gate incorporates a weir to control water velocity?

A proportional gate is specifically designed to incorporate a weir, which helps to control water velocity as it passes through the gate. In wastewater treatment and hydrology, the use of a weir allows for a more controlled flow of water by creating a measurement point for water levels, thereby enabling the adjustment of water discharge rates. This ensures that the water velocity remains within desirable limits, which is crucial for protecting infrastructure, reducing erosion, and ensuring effective treatment processes downstream.

The design of a proportional gate allows for fine-tuning of the flow based on the water level and can actively respond to changes in inflow, making it particularly effective in scenarios where maintaining a steady and controlled flow is essential. By adjusting the opening of the gate proportionally to the water level, operators can efficiently manage the water flow, preventing conditions that may lead to flooding or excessive velocity that could disrupt treatment processes.