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→Concentrated overland flow
* [[Stone]] and [[geotextile]] filter: A shallow excavation on the filter media bed surface at the inlet, lined with geotextile and rip rap or decorative stone cover; and,
* [[Stone]] and [[geotextile]] filter: A shallow excavation on the filter media bed surface at the inlet, lined with geotextile and rip rap or decorative stone cover; and,
*[[Sand filters]] (well suited for underground [[infiltration]]).
*[[Sand filters]] (well suited for underground [[infiltration]]).
*Concrete sump pretreatment device.
==Concentrated underground flow==
==Concentrated underground flow==