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Line 1: − + − The exceptions are the depth (''d<sub>T</sub>'') and practice permeable (footprint) area (''A<sub>p</sub>''), as only one of these is required to find the other. + − + Line 37:
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→Size a bioretention cell where drainage area and practice area are fixed
Before beginning the sizing calculations most of the following parameters must be known or estimated.
This article describes recommended design approaches when available space for the practice is constrained.<br>
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Note that some of these parameters are limited:
Before beginning the sizing calculations certain parameters must be known or estimated. See [[Bioretention: Sizing]] for parameter descriptions and conceptual diagram illustrating key components of bioretention practices. Note that some of these parameters are limited:
#The ''maximum'' total depth will be limited by construction practices i.e. not usually > 2 m.
#The ''maximum'' total depth will be limited by construction practices i.e. not usually > 2 m.
#The ''maximum'' total depth may be limited by the [[Infiltration| conditions underground]] e.g. the groundwater or underlying geology/infrastructure.
#The ''maximum'' total depth may be limited by the [[Infiltration| conditions underground]] e.g. the groundwater or underlying geology/infrastructure.
*''f''' = Design infiltration rate (m/h)
*''f''' = Design infiltration rate (m/h)
*''n''' = Effective porosity of the storage reservoir fill material}}
*''n''' = Effective porosity of the storage reservoir fill material}}
These equations assume that infiltration occurs primarily through the base of the facility.
These equations assume that infiltration occurs primarily through the base of the facility.<br>
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This spreadsheet tool has been set up to perform all of the infiltration practice sizing calculations shown above.<br>
This spreadsheet tool has been set up to perform all of the infiltration practice sizing calculations shown above.<br>