Changes

[[File:Bioretention sizing update.png|thumb|500px|The vertical storage zones in a bioretention cell include: ponding, mulch, filter media, choker layer, embedded pipe diameter depth and the storage reservoir.]]

[[File:Bioretention sizing update.png|thumb|550px|The vertical storage zones in a bioretention cell include: ponding, mulch, filter media, choker layer, embedded pipe diameter depth and the internal water storage (IWS) reservoir.]]

This article is specific to [[bioretention]], vegetated systems that infiltrate water to the native soil.

This article is specific to [[bioretention]], vegetated systems that infiltrate water to the native soil.

If you are designing a planted system which does not infiltrate water, see advice on [[Planters: Sizing]].<br>

If you are designing a planted system which does not infiltrate water, see advice on [[Planters: Sizing]].<br>

 

{{TOClimit|2}}<br>

{{TOClimit|3}}<br>

<br>

<br>

Many of the dimensions in a bioretention system can be predetermined according to the function of the component. There is greatest flexibility in the ponding depth, filter media depth and the depth of the internal water storage reservoir beneath the optional underdrain pipe. The table below describes some recommended values to use to begin the design process.   

Many of the dimensions in a bioretention system can be predetermined according to the function of the component. There is greatest flexibility in the ponding depth, filter media depth and the depth of the internal water storage reservoir beneath the optional underdrain pipe. The table below describes some recommended values to use to begin the design process.   

This spreadsheet tool has been set up to perform all of the bioretention sizing calculations shown below and allows side-by-side comparison of equation outputs for each potential design approach or constraint scenario.<br>

This spreadsheet tool has been set up to perform all of the bioretention sizing calculations shown below and allows side-by-side comparison of equation outputs for each potential design approach or constraint scenario.<br>

{{Clickable button|[[Media:Infiltration Sizing 20200525 locked.xlsx|Download the infiltration practice sizing tool]]}}

{{Clickable button|[[Media:Infiltration Sizing 20220617 locked (1).xlsx|Download the infiltration practice sizing tool]]}}

==Decide if an underdrain will be included==

==Decide if an underdrain will be included==

Note that this is a minor adaptation (metric units and formatting) from the original tool, written and [https://pubs.usgs.gov/sir/2010/5102/ hosted by the USGS].

Note that this is a minor adaptation (metric units and formatting) from the original tool, written and [https://pubs.usgs.gov/sir/2010/5102/ hosted by the USGS].

</poem>

</poem>