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In
this gravity-fed system, a connecting line leads to several
feet of perforated distribution pipe set in one shallow trench
that follows the contour of the land. Sand and gravel, together
with a geotextile covering, are placed in the contour trench.
This system provides a large area for effluent dispersal into
the soil. As with any soil absorption system placed on slightly
sloping land, an interceptor ditch may be placed up slope
from the dispersal trench to help divert surface runoff away
from the trench.
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