Changes

#[[Bioretention]] has a maximum recommended catchment impervious area to practice permeable (footprint) area ratio, R (or I/P ratio) of 20.

#[[Bioretention]] has a maximum recommended catchment impervious area to practice permeable (footprint) area ratio, R (or I/P ratio) of 20.

==Size a bioretention cell for constrained depth==

==Size a bioretention cell with no underdrain for constrained depth==

If there is a constraint to the depth (''d_T'', m) of the practice, calculate the required footprint area (''A_p'', m²), as:

If there is a constraint to the depth (''d_T'', m) of the practice, calculate the required footprint area (''A_p'', m²), as:

<math>A_{p}=\frac{A_i\times i\times D}{(n\times d_{T})+(f'\times D)}</math>

<math>A_{p}=\frac{A_i\times i\times D}{(n\times d_{T})+(f'\times D)}</math>