Gravity often dictates storm drainage design. Pipe can only run so far with pitch before crossing over into livable space. At times, it requires a leader to drop down in the middle of the building, with the only solution being to excavate a long distance — still accounting for pitch — through the interior to reach the civils.
But what if you could completely eliminate excavation from the schedule? What if the pipe could run tight to the ceiling for a long run? What if the pipe diameter could be smaller while still providing the same flow rates?