Hydroduct Coil 600 Perimeter Drain is a dual profile drainage composite engineered to replace traditional perforated pipe and aggregate perimeter drain systems. It consists of a combination low and high profile drainage core, a high performance geotextile and a high strength backing film which serves as an effective transport system to evacuate water from the drainage composite and surrounding soil. It is intended to be applied at the base of foundation walls, bridge abutments, retaining walls, tunnels, around earth sheltered structures and under slabs. Hydroduct Coil 600 geotextile serves to retain soil while allowing water to pass from the soil to the core. It is securely bonded to the core to prevent intrusion of the fabric into the core during service. The backing film ensures compatibility with the waterproofing membrane system.