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Line 82:
Line 82:
→Time for drainage of surface ponded water
<math>t=\frac{dp'}{Kf}</math>
<math>t=\frac{dp'}{Kf}</math>
Where <br>
Where <br>
d<sub>p</sub>' is the mean or effective surface ponding depth.<br>
d<sub>p</sub>' is the mean or effective surface ponding depth (mm).<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 (mm/h).
==Drainage time to empty facility==
==Drainage time to empty facility==