Depends on how high they are, how long they are, and on the expected destructive effort they are designed to resist.
IN saying this though they are usually in the hundred thousands well up to the millions. It also depends on what country you are in because the impacts of the environment are different in every part of the world.... £10,000
Sea walls in England cost £700,000 per meter, if that helps.
Groynes, sea walls and rip-raps
The island of Stor Rullingen is for sale for 6,000,000 Euros
In reclamation from the sea, you then have to protect the land with sea walls, expensive to build, needing maintenance.
It slowly degrades shores and walls on the sea or rivers.
The cost of breakwaters vary by the location. Breakwaters are used to keep boats from being damaged on turbulent seas when sea steading. The approximate cost is $30,000
it cost around £8.950 for all the sea wall with barriers!
Sea walls are very expensive. In South East England they can cost around £2million to £5million per km
7 cents
anywhere from $3.50-15.00/s.f. with no walls.
49.95
Rock armour cost the same as sea walls because rock armour is a form of sea wall to it cost £6000 per m. Just go to http://www.mjanderson.chislehurst.btinternet.co.uk/coastseadefence.htm Is that metres or miles?
1.4 Billion US in 2006
10 dollars a day
Around 10,000 to a 1000$
By waves smashing against the sea walls
This is when waves in the sea crash against sea walls, for example, over a long period of time. Eventually there will be marks on the sea walls and this is called wave scouring.
Groynes, columns of boulders and sea walls are the most popular ones. sea walls are the most expensive, costing about 700,000 pounds per metre!