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→Time for drainage of surface ponded water
To calculate the time (''t'') to fully drain surface ponded water through the filter media or planting soil:
To calculate the time (''t'') to fully drain surface ponded water through the filter media or planting soil:
<math>t=\frac{dp'}{Kf}</math>
<math>t=\frac{dp'}{Kf}</math>
Where
Where <br>
d<sub>p</sub>' is the mean or effective surface ponding depth.
d<sub>p</sub>' is the mean or effective surface ponding depth.<br>
K<sub>f</sub> is the minimum saturated hydraulic conductivity of the filter media or planting soil.
K<sub>f</sub> is the minimum saturated hydraulic conductivity of the filter media or planting soil.