Aquadrain 100BD is a two part prefabricated drainage composite consisting of a 3-dimensional polystyrene core which is wrapped with a heavy non-woven polypropylene filter fabric. It replaces aggregate drainage providing a consistent drainage flow within a thin layer. The 3-dimensional, dimple core provides compressive strength and allows water to flow to drainage discharge pipes. The filter fabric allows water, or other liquids to pass into the drainage core while restricting the passage of soil particles. The fabric is bonded to the core to minimize fabric intrusion into the core resulting from backfill pressure.