Changes

* [[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.

*Concrete sump pretreatment device. [https://acfenvironmental.com/products/stormwater-management/filtration/rain-guardian/ Rain Guardian] is one example of a proprietary sump device

==Concentrated underground flow==

==Concentrated underground flow==