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Line 77: To size a bioretention facility using this page, the [[design infiltration rate]] (q' in mm/hr, after correction) of the native underlying soils must estimated, and the [[maximum available excavation depth]] (d in m) is the primary constraint to sizing. <br> If the space on the ground is the tighter constraint to design, try this article on [[sizing bioretention for space]]. {{TOClimit|2}}{{#widget:Google Spreadsheet|key=1MHTOh9cVHRTfpEwL-7KxTe3G31d-sUbTXYFFbXHzfng|width=600|height=400}}<iframe src="https://docs.google.com/spreadsheets/d/e/2PACX-1vQGMHASguRdALH5nOF3AZeox9vFCJh9PMtj8nG-rmB4NMqtWinbimGirn1dfcUzeJm02LWfYjx0QXB6/pubhtml?gid=172024974&single=true&widget=true&headers=false"></iframe>
→Calculate the remaining dimensions
*''A<sub>c</sub>'' is the catchment area (Ha),
*''A<sub>c</sub>'' is the catchment area (Ha),
*''C'' is the runoff coefficient of the catchment area, and
*''C'' is the runoff coefficient of the catchment area, and
* 0.095 is the product of a typical runoff coefficient for impermeable surfaces (0.95) and the units correction between m<sup>3</sup> and mm.Ha. (0.1)}}
* 0.1 is the units correction between m<sup>3</sup> and mm.Ha.}}
* Step 8. Divide required storage (m<sup>3</sup>) by the 1 dimensional storage (in m) to find the required footprint area (A_p) for the bioretention in m<sup>2</sup>.
* Step 8. Divide required storage (m<sup>3</sup>) by the 1 dimensional storage (in m) to find the required footprint area (''A<sub>p</sub>'') for the bioretention in m<sup>2</sup>.
* Step 9. Calculate the peak flow rate (''Q<sub>p</sub>'', in L/s) through the filter media:
* Step 9. Calculate the peak flow rate (''Q<sub>p</sub>'', in L/s) through the filter media:
<math>Q_{p} = A_{p}\times K_{sat}\times 3.6 \times 10^{-3}</math>
<math>Q_{p} = A_{p}\times K_{sat}\times 3.6 \times 10^{-3}</math>
*''A<sub>p</sub>'' is the area of the practice (m<sup>2</sup>).}}
*''A<sub>p</sub>'' is the area of the practice (m<sup>2</sup>).}}
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==Step 1, total volume==
==Step 1, total volume==