The drain field typically consists of an arrangement of trenches containing perforated pipes and porous material (often gravel) covered by a layer of soil to prevent animals (and surface runoff) from reaching the wastewater distributed within those trenches. Organic materials in the liquid are catabolized by a microbial ecosystem.Ī septic drain field, a septic tank, and associated piping compose a septic system. Drainage fields should be set out as a continuous loop fed from the inspection chamber.Septic drain fields, also called leach fields or leach drains, are subsurface wastewater disposal facilities used to remove contaminants and impurities from the liquid that emerges after anaerobic digestion in a septic tank.An inspection or a sample chamber should be installed between the septic tank and the drainage field.The remainder of the trench can be filled with soil the distribution pipes should be laid at a minimum depth of 500mm below the surface.ĭrainage trenches should be from 300mm to 900mm wide, with areas of undisturbed ground 2m wide being maintained between parallel trenches. Trenches should be filled to a level 50mm above the pipe and covered with a layer of non-woven geotextile to prevent the entry of silt.Pipes should be laid on a 300mm layer of clean shingle or broken stone graded between 20mm and 50mm.Drainage fields should be constructed using perforated pipe, laid in trenches of a uniform gradient which should not be steeper than 1:200.
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