Simply renovate the existing structures without adding any auxiliary structures;
Installed on the weir wall of the discharge outlet, water is discharged from the upper part of the weir door;
When the downstream water level exceeds the height of the weir, the weir gate is lifted by the buoyancy of the water until it is completely closed to prevent back flow; When the upstream water level is higher than the downstream water level, the weir gate opens under the action of water pressure to achieve drainage;
The head loss is low, and the opening degree of the weir gate is determined by the pressure difference. The target pressure difference can be obtained through filling design;
Water-power control, no operating costs, reliable operation, and simple maintenance.
