what is it

[boatradioman]

there these wall type things which stay in the bottom of harbors and when there is a storm it is raised up to protect the boats and house in the harbor.
What is this called?

 

[chicknwing]

Re: what is it

are you talking about a sea wall?

 

[springhead]

Re: what is it

Hurricane Barrier perhaps

 

[tashasdaddy]

Re: what is it

they were being built in Venice Italy, to stop flooding. the Netherlands, has some swing type gates also for the same purpose.