Changes

*The overflow must be situated at the far end of the facility to prevent any localised ponding to cause bypassing of the infiltration facility.  

*The overflow must be situated at the far end of the facility to prevent any localised ponding to cause bypassing of the infiltration facility.  

*Offline facilities use flow splitters or bypass channels that only allow the required water quality storage volume to enter the facility.  

*Offline facilities use flow splitters or bypass channels that only allow the required water quality storage volume to enter the facility.  

:Higher flows are diverted and do not enter the infiltration practice. A pipe can by used for this, but a weir or [[curb cuts|curb cut]] minimizes clogging and reduces the maintenance frequency.

:Higher flows are diverted and do not enter the infiltration practice. A pipe can by used for this, but a [[weir]] or [[curb cuts|curb cut]] minimizes clogging and reduces the maintenance frequency.

==Overflow elevation==

===Overflow elevation===

The invert of the overflow should be placed at the maximum water surface elevation of the practice. i.e. the maximum ponding depth. A good starting point is around 300 mm over the surface of the practice. However, consideration should be given to public safety and time for the ponded water to drain. See [[Bioretention: Sizing#Additional step for system without underdrain|Bioretention]]

The invert of the overflow should be placed at the maximum water surface elevation of the practice. i.e. the maximum ponding depth.  

A good starting point is around 300 mm over the surface of the practice. However, consideration should be given to public safety and drainage time|time for the ponded water to drain.  

See [[Bioretention: Sizing#Additional step for system without underdrain|Bioretention]] and [[Stormwater planters]]

==Options==

 

===Options===

Metal grates are recommended (over plastic) in all situations.  

Metal grates are recommended (over plastic) in all situations.  

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==Gallery==

===Gallery===

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