Hydroduct® 660 Drainage Composite consists of a thick drainage core and high performance geotextile. The high strength, non woven geotextile is designed to maintain permittivity while protecting the drainage composite from jobsite damage prior to, and during, the installation of the overburden. Hydroduct® 660 is designed to collect and transport water. It can be used on all horizontal applications up to a static load of 7000 lbs/ft2 (34000 kg/m2) or approximately 50 ft (15.2 m) of soil. It serves as a combination drainage and protection course for all Bituthene® waterproofing membranes.