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Line 320: <math>d_{r} = \frac{f'\times t}{n} </math>''f''' = [[design infiltration rate]] of the native soil (m/h) <br>''t'' = [[drainage time]], based on local criteria or long-term average inter-event period for the location (e.g. 72 hr in southern Ontario).<br>''n'' = Porosity of the stone bed aggregate material (typically 0.4 for 50 mm dia. [[reservoir aggregate|clear stone]])<br>
→Calculation
====Calculation====
====Calculation====
Filter Bed Surface Infiltration Rate <math>i = 50mm \frac Δ_T50}</math><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>
Where
Where <br>
==Natural or Simulated Storm Event Testing==
==Natural or Simulated Storm Event Testing==