The rules require runoff from impervious surface to be pre-treated prior to discharge to an infiltration system. Does this also apply to roof runoff?
Discharge of clean roof runoff into a system that provides infiltration is considered a drywell discharge, which does not require pre-treatment. Note that certain types of discharges, such as an industrial development that would have an air discharge or other situations where contaminants could deposit on the roof, cannot be discharged to a drywell. Additional details are included in Chapter 9.4 of New Jersey’s Stormwater BMP Manual.
Related Questions
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