Changes

{{Plainlist|1=Where:

{{Plainlist|1=Where:

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

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

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

*''t'' = [[Drainage time]] (hrs). 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]]}}