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When is a storm water management plan (SWMP) required?

April 26, 2017Management Plan storm swmp water

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When is a storm water management plan (SWMP) required?

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A SWMP is required under any of the following scenarios: (1) Development or redevelopment activities cause a land disturbing activity of 1 acre or more. (2) Development or redevelopment activities cause the cumulative area of all land disturbing activites at a property to be 1 acre or more over a 3-year period. (3) Development or redevelopment activities cause an increase of 0.5 acres or more of impervious area.