Typically bypass separators are chosen in areas where there is an acceptable risk not to provide full treatment on high flows. Bypass separators fully treat low rainfall events of less than 6.5mm/hr (about 99% of rainfall events).
Flow rate above the aforementioned rate bypass the separator as the level of Hydrocarbons are deemed to be at an acceptable level. Typically, these would be where the collection surface is a carpark and lightly used roadway.
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