Changes

*Step 1: Determine what the planting needs are and assign appropriate depth of media, using the table above.  

*Step 1: Determine what the planting needs are and assign appropriate depth of media, using the table above.  

*Step 2: Select an underdrain pipe diameter (typically 100 - 200 mm), assign this as an 'embedding' depth. *Note that this component does not apply if a downstream riser is being used.   

*Step 2: Select an underdrain pipe diameter (typically 100 - 200 mm), assign this as an 'embedding' depth. *Note that this component does not apply if a downstream riser is being used.   

*Step 3: Calculate the maximum possible storage reservoir depth beneath the pipe (''d_s''):

*Step 3: Calculate the maximum possible storage reservoir depth beneath the pipe (''d_{s, max}''):

<math>d_{s}=\frac{f'\times 96}{0.4}</math>

<math>d_{s, max}=\frac{f'\times '}{0.4}</math>

{{Plainlist|1=Where:

{{Plainlist|1=Where:

*''f''' = Design infiltration rate (mm/hr), and

*''f''' = Design infiltration rate (mm/hr), and

*96 = [[Drainage time]] (hrs)

*''t'' = [[Drainage time]] (hrs), e.g. 96 hours, check local regulations for drainage time requirements. 

*0.4 = Void ratio of [[reservoir gravel|clear stone]]}}

*''0.4'' = Void ratio of [[reservoir gravel|clear stone]]}}

===Additional step for system without underdrain===

===Additional step for system without underdrain===