Changes

*[[Vegetated filter strips]]

*[[Vegetated filter strips]]

*[[Level spreaders]]

*[[Level spreaders]]

A gravel diaphragm typically requires less setback between the catchment and the BMP.  Where space permits, these two 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!

 

==Concentrated overland flow==

==Concentrated overland flow==

Where a [[Curb cuts| curb cut]], [[Downspout disconnection| a disconnected downspout]] or a [[Swales| swale]] directs surface water to a point, increasing the flow rate, one or more of the following pretreatments should be considered:

Where a [[Curb cuts| curb cut]], [[Downspout disconnection| a disconnected downspout]] or a [[Swales| swale]] directs surface water to a point, increasing the flow rate, one or more of the following pretreatments should be considered:

*[[Sand filters]] (well suited for underground [[infiltration]])

*[[Sand filters]] (well suited for underground [[infiltration]])

*[[Screens and racks]]

*[[Screens and racks]]

==Concentrated underground flow==

==Concentrated underground flow==