Stormwater & Hydrology

Stormwater Design vs. Zoning Permits in Georgia: Who Handles Each for Builders

Quick answer: In Georgia, stormwater design and zoning are two separate workstreams with two different approval paths. Construction stormwater is an environmental permit issued by the Georgia Environmental Protection Division (EPD) and enforced locally through a Land Disturbance Permit (LDP) and, in most metro jurisdictions, an MS4 post-construction stormwater ordinance. Zoning is a land-use decision…

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Detention Pond Design in Metro Atlanta: GSMM Sizing Criteria, Costs, and Approval Timelines

In Metro Atlanta, a detention pond is sized against four separate criteria in the Georgia Stormwater Management Manual, not one. You must treat the water quality volume from the first 1.2 inches of rainfall, provide 24-hour extended detention of the 1-year 24-hour storm for channel protection, hold the post-development 25-year 24-hour peak discharge to the…

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