Changes

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:

*[[Forebays]] (well suited for bioretention cells)

*[[Forebays]] (well suited for bioretention cells)

*[[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==

This type of pretreatement is dominated by proprietary systems, some of which have undergone verification under the [http://etvcanada.ca/ Environmental Technology Verification (ETV)] program.  

This type of pretreatement is dominated by proprietary systems, some of which have undergone verification under the [http://etvcanada.ca/ Environmental Technology Verification (ETV)] program.