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- Also see [[stone]] for erosion control at inlets.
→Concentrated overland flow
==Concentrated overland flow==
==Concentrated overland flow==
Where a [[Curb cuts| curb cut]], [[Downspout disconnection| a disconnected roof downspout]] or a [[Swales| swale]] collects and conveys surface runoff as concentrated flow, which increases the flow rate, one or more of the following pretreatment features should be considered:
Where a [[Curb cuts| curb cut]], [[Downspout disconnection| a disconnected roof downspout]] pipe, [[Swales| swale]], trench drain, side inlet catch basin or other pre-fabricated inlet structure collects and conveys runoff as concentrated overland flow, which increases the flow rate, one or more of the following pretreatment features should be considered:
*[[Pretreatment features| Forebays]] (well suited for bioretention cells)
* Catch basin or other inlet structure sump;
*[[Sand filters]] (well suited for underground [[infiltration]])
* [[Level spreader]];
*[[Pretreatment features| Forebays]] (well suited for bioretention cells);
* [[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]]).
==Concentrated underground flow==
==Concentrated underground flow==