Using temporary barriers, berms and other obstacles, entrance to markets and specific communities is controlled through checkpoints, which allow citizens to come and go but which prevent would-be attackers.
Governor Jindal has been appealing to the Army Corps of Engineers to expedite consideration of his request that he be allowed -- and others be allowed to build these barriers or these berms to protect.
When you go to the west of the Mississippi River, they're actually going to have to take sand from offshore, actually deposit it on the seabed and then retransmit it to make the berms on the islands.