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The NoMound® onsite system is a newly patented technology that allows conventional onsite systems to be used in high groundwater building sites without building a sand mound. Currently approved for five installations under Florida's Innovative Systems Program, NoMound® will be introduced to the general market in mid 2000. About the Technology The NoMound® system uses low air pressure to "push" down the water table around an onsite system, creating a zone of unsaturated soils so that a conventional onsite system drainfield will function properly in a high groundwater setting. |
A small-wattage pump introduces air into a below ground geomembrane "barrier system" that has been constructed around the sides and over the top of the drainfield of a conventional onsite system. As air is introduced into the enclosure at a slight positive pressure (less than 2 psig), the high water table is lowered to the setpoint of the control system and the desired thickness of unsaturated soils is created. Wastewater effluent from the septic tank or ATU is pumped to the drainfield, and the conventional absorption bed's physical and biological processes are maintained. |