Acworth, GA Environmental Rules: Flood Zones (2026)

Article III of Chapter 50, the "Model Floodplain Management/Flood Damage Prevention" article adopted by Ord. No. 2006-28 in 2006, applies to all areas within the city per § 50-72, using the Flood Insurance Study dated August 18, 1992 (and any Cobb County FIS covering annexed land) as its mapping basis under § 50-74. 01 foot or more, reduce flood storage capacity, change upstream or downstream flow depth and velocity, or create hazardous or erosion-producing velocities or excessive sedimentation. 01-foot cap can still proceed only if it compensates for lost storage capacity on the same property, stabilizes cut slopes to a grade no steeper than 2 percent, and backs the no-rise claim with a step-backwater engineering analysis under § 50-94, plus a conditional letter of map revision from FEMA for any significant change to the mapped floodplain.

Inside the regulatory floodway itself, § 50-95 goes further: earthen fill, new construction, and substantial improvements are prohibited outright, with narrow allowances only for bridges, culverts, roadways, and utilities that a hydrologic and hydraulic analysis shows will not raise pre-project flood elevations, floodway elevations, or floodway widths. The public works department administers all of it, and owners of property in an altered or relocated floodplain segment carry an ongoing duty under § 50-96 to maintain the flood-carrying capacity the city approved.