Aquadrain 15X drainage composite is a two-part prefabricated sheet drain consisting of a polypropylene formed dimple core covered with a non-woven polypropylene filter fabric on one side. The formed dimple core provides compressive strength and collects water for flow to drainage discharge pipes. The filter fabric is bonded to each dimple to minimize fabric intrusion into the core resulting from backfill pressure. The filter fabric allows water or other liquids to pass into the drainage core while restricting the passage of soil particles. The polypropylene core resists chemical attack and degradation in soil.