Changes

==Planning considerations==

==Planning considerations==

<h3>Space</h3>

===Space===

*For optimal performance bioretention facilities should receive runoff from between 5 to 20 times their own surface area.  

*For optimal performance bioretention facilities should receive runoff from between 5 to 20 times their own surface area.  

*In the conceptual design stage it is recommended to set aside approximately 10 - 20 % of a catchment area to the bioretention facility.  

*In the conceptual design stage it is recommended to set aside approximately 10 - 20 % of a catchment area to the bioretention facility.  

:The maximum width of a facility is determined by the reach of the construction machinery, which must not be tracked into the cell.

:The maximum width of a facility is determined by the reach of the construction machinery, which must not be tracked into the cell.

{{:Bioretention: Context}}

{{:Bioretention: Context}}

<h3>Infiltration</h3>

===Infiltration===

Some form of stormwater landscaping (bioretention) can be fitted into most spaces. One of the key decisions is whether to infiltrate all of some of the collected water into the native soil. Although there are some [[Infiltration#Constraints|constraints]] to infiltrating water, it is preferable to do so where possible. [[Bioretention:_Partial_infiltration|Partial infiltration]] facilities are a popular choice over 'tight' soils (infiltration ≤ 15 mm/hr).

Some form of stormwater landscaping (bioretention) can be fitted into most spaces. One of the key decisions is whether to infiltrate all of some of the collected water into the native soil. Although there are some [[Infiltration#Constraints|constraints]] to infiltrating water, it is preferable to do so where possible. [[Bioretention:_Partial_infiltration|Partial infiltration]] facilities are a popular choice over 'tight' soils (infiltration ≤ 15 mm/hr).

{{:Bioretention: Variations}}

{{:Bioretention: Variations}}

<h3>Inlets and pretreatment options</h3>

===[[Inlets]] and pretreatment options===

Options for pretreatment include:

Options for [[pretreatment]] include:

*A [[gravel diaphragm]] for sheet flow

*A [[gravel diaphragm]] for sheet flow

*[[Vegetated filter strips]] for sheet flow

*[[Vegetated filter strips]] for sheet flow

===Overflow routing===

===Overflow routing===

{{:Overflow}}

{{:Overflow}}

<h3>Design for maintenance</h3>

===Design for maintenance===

==Design==

==Design==