The floodgate is a common component in all sorts of systems ranging from reservoirs, dams, and spillways. Essentially, any human constructed system that is used to control the level and flow of water in a river, lake, or stream will be equipped with some type of floodgate.

What are dam gates called?

Floodgates, also called stop gates, are adjustable gates used to control water flow in flood barriers, reservoir, river, stream, or levee systems.

Why do floodgates open?

If an action or a decision opens the floodgates, it allows something to happen a lot or allows many people to do something that was not previously allowed: Officials are worried that allowing these refugees into the country will open the floodgates to thousands more.