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→Calculation
====Calculation====
====Calculation====
'''Filter Bed Surface Infiltration Rate:''' <math>(i)</math> ''= 50'' <math>mm</math> ''/ ΔT<sub>50</sub>''<br>
'''Filter Bed Surface Infiltration Rate:''' <math>(i)</math> ''= 50'' <math>mm</math> ''/ ΔT<sub>50</sub>''<br>
Where<br>
Where<br>
''ΔT<sub>50</sub>'' = Time to drain last 50 mm of surface ponded water<br>
''ΔT<sub>50</sub>'' = Time to drain last 50 mm of surface ponded water<br>
''T<sub>1</sub>'' = Post-storm date and time (mm/dd/yyyy hh:mm:ss) when surface ponding water level reaches ''50 mm in depth''.<br>
''T<sub>1</sub>'' = Post-storm date and time (mm/dd/yyyy hh:mm:ss) when surface ponding water level reaches ''50 mm in depth''.<br>
''T<sub>2</sub>'' = Post-storm date and time (mm/dd/yyyy hh:mm:ss) when surface ponding is fully drained<br>
''T<sub>2</sub>'' = Post-storm date and time (mm/dd/yyyy hh:mm:ss) when surface ponding is fully drained<br>
==Natural or Simulated Storm Event Testing==
==Natural or Simulated Storm Event Testing==