What is a low-pressure pipe system?
A low-pressure distribution (LPD) system is a shallow, pressure-dosed soil absorption system with a network of small diameter perforated pipes placed in narrow trenches. Originating in North Carolina and Wisconsin, LPD systems were developed as an alternative to conventional soil absorption systems to eliminate problems such as: clogging of the soil from localized overloading, mechanical sealing of the soil trench during construction, anaerobic conditions due to continuous saturation, and a high water table. The LPD system has the following design features that overcome these problems: 1) shallow placement, 2) narrow trenches, 3) continuous trenching, 4) pressure-dosed with uniform distribution of the effluent, 5) design based on area loading, and 6) resting and reaeration between doses. The main components of an LPD system are: • A septic tank or an aerobic unit; • Pumping (dosing) chamber (submersible effluent pump, level controls, high water alarm, and supply manifold); • Small diam
