Changes

Note that narrow, linear bioretention features (or [[bioswales]]) drain faster than round or blocky footprint geometries.  

Note that narrow, linear bioretention features (or [[bioswales]]) drain faster than round or blocky footprint geometries.  

*Begin the drainage time calculation by dividing the area of the practice (''A_p'') by the perimeter (''x'').

*Begin the drainage time calculation by dividing the area of the practice (''A_p'') by the perimeter (''x''):

*To estimate the time (''t'') to fully drain the facility:  

*To estimate the time (''t'') to fully drain the facility:  

:<math>t=\frac{nA_{p}}{f'x}ln\left [ \frac{\left (d_{T}+ \frac{A_{p}}{x} \right )}{\left(\frac{A_{p}}{x}\right)}\right]</math>

<math>t=\frac{nA_{p}}{f'x}ln\left [ \frac{\left (d_{T}+ \frac{A_{p}}{x} \right )}{\left(\frac{A_{p}}{x}\right)}\right]</math>

{{Plainlist|1=Where:

{{Plainlist|1=Where:

*''n'' is the porosity of the filter media,  

*''n'' is the porosity of the filter media,