Changes

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 can be limited by site conditions and factors influencing constructability:

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 to avoid the need for benching and shoring open cut excavations.

#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. water table or underlying geology/infrastructure).

#The ''maximum'' total depth may be limited by the need to support vegetation cover over it (e.g. at least 30 cm of planting soil backfill over the BMP to support grasses)

*The ''maximum.. total depth may be limited by the desire to install the practice below the maximum frost penetration depth in the proposed location.

#The ''maximum'' total depth may be limited by the desire to support vegetation cover over it (e.g. at least 30 cm of planting soil backfill over the BMP to support grasses)

#[[Infiltration trenches]], [[Infiltration chambers| chambers]] and [[bioretention]] have a maximum recommended I/P ratio of 20.

#[[Infiltration trenches]], [[Infiltration chambers| chambers]] and [[bioretention]] have a maximum recommended I/P ratio of 20.