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Shallow Gravelless Drainfields
Shallow Gravelless Drainfields are the ideal subsurface disposal method
for highly-treated sand filter effluent. In the typical "septic tank to
drainfield" system, drainfields are generally 24" deep or more and require
costly excavation and rock fill. But because of its exceptionally high
quality, the effluent produced by sand filters can be absorbed at higher
rates than other wastewater and can be discharged to shallow trenches.
Shallow trenches reduce installation costs and minimize site impacts,
virtually eliminating the need to remove existing trees and vegetation.
Moreover, in most states, shallow trenches can be smaller in total area
than the typical drainfield. Most importantly, shallow trenches provide
additional treatment of (and nutrient removal from) effluent. In fact,
our research studies indicate
that an additional 50% reduction in total nitrogen occurs in shallow trenches.
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