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The sizing calculations require that most of the following parameters be known or estimated.
The sizing calculations require that most of the following parameters be known or estimated.
The exceptions are the depth (''d'') and the permeable footprint area of the practice (''Ap''), as only one of these is required to find the other.
The exceptions are the depth (''d'') and the permeable footprint area of the practice (''Ap''), as only one of these is required to find the other.
Note that some of these parameters are limited:
Note that some of these parameters can be limited by site conditions and factors influencing constructability:
#The ''maximum'' total depth will be limited by construction practices i.e. usually ≤ 2 m.
#The ''maximum'' total depth will be limited by construction practices i.e. 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).