1) Waste to be burned 
a man-made collection of brush and woody cover placed in a body of water in order to attract game fish
Usually refers to a mass of small- to medium-sized tree limbs lying in the water. Brush piles may be only one or two feet across, or they may be extremely large and they may be visible or submerged. They can be created by Mother Nature or manmade. They usually hold fish. And fishermen.