DWC Pipe, short for Double Wall Corrugated pipes is similar to standard HDPE pipes in that it has separate exterior and internal surfaces, which adds power and stiffness. It is made of High Density Polyethylene, which has an extremely long life span. It is corrugated on the outside and flat on the inside, and come in sizes ranging from 75 mm to 1.0 m diameter. This type of pipe is lightweight and can be utilized for non-pressure underground sewerage, runoff, and cross drainage applications, as well as rainwater harvesting. DWC Pipe needs no maintenance and, once built, will remain underground for several years.