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→Overland sheet flow
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*[[Level spreaders]]
==Overland sheet flow==
==Overland sheet flow==
The following pretreatements are recommended where sheet flow is being directed to a BMP (e.g. a [[Bioretention cells|bioretention cell]]) receiving flow from the edge of an impermeable surface such as an asphalt parking lot or a paved plaza:
The following pretreatements are recommended where sheet flow is being directed to a BMP (e.g. a [[Bioretention cells|bioretention cell]]) receiving flow from the edge of an impermeable surface such as an asphalt parking lot or a paved plaza:
*[[Level spreaders]]
*[[Gravel diaphragms]]
*[[Gravel diaphragms]]
*[[Vegetated filter strips]]
*[[Vegetated filter strips]]
A gravel diaphragm typically requires less setback between the catchment and the BMP. Where space permits, these three designs can be used in combination to even greater effect!
A gravel diaphragm typically requires less setback between the catchment and the BMP. Where space permits, these three designs can be used in combination to even greater effect!