flap gate
flap gate · flap gates
A device that allows water to flow in one direction only through a culvertA device that allows water to flow in one direction only through a culvert; it is used especially to drain surface water from coastal marshes at low tide
Значення
значень: 1A device that allows water to flow in one direction only through a culvert; it is used especially to drain surface water from coastal marshes at low tide