Corrugated metal pipe is available with perforations of varying size and spacing and is primarily used for groundwater collection or recharge. Perforated pipe is used in a wide variety of applications including trench drains, structure under drains, gas collection, water wells, and dry wells. Perforated pipe is also used in retention/recharge systems where collected storm water is released into the ground through exfiltration. Pipe may be custom perforated to your specifications or in accordance with AASHTO M-36.