All barriers have a special design. So, in the upper part of them a special hole is made for water getting into the barrier, and the same hole for draining water is made below. Instead of water, you can use sand or any other building material.
All barriers have a special design. So, in the upper part of them a special hole is made for water getting into the barrier, and the same hole for draining water is made below. Instead of water, you can use sand or any other building material.
