Columbus, GA Environmental Rules: Flood Elevation Requirements (2026)

Columbus, Georgia adopted its floodplain ordinance under Article IX, Section II of the Georgia Constitution and O.C.G.A. § 36-1-20(a), codified as UDO Chapter 8, Article 5. The ordinance applies to all Areas of Special Flood Hazard mapped in the FEMA Flood Insurance Study dated September 5, 2007, including land annexed from areas covered by the separate Fort Benning FIS, per § 8.5.2.B. A development permit from the Director of Engineering is required before any land is disturbed or structure built in a mapped hazard area, under § 8.5.2.C.

Under § 8.5.4.B(1), new residential construction or substantial improvement must have the lowest adjacent grade above the base flood elevation and the lowest floor, including any basement, elevated no lower than two feet above the base flood elevation (BFE); HVAC, electrical, ventilation and plumbing service equipment must also sit at or above the BFE. Manufactured homes on individual lots or in new manufactured-home parks must have the lowest floor elevated no lower than one foot above the BFE, or have the chassis supported on reinforced piers of at least 36 inches, per § 8.5.4.B(3).

Where a stream exists but no BFE data have been mapped, new construction must clear three feet above the highest adjacent grade, per § 8.5.4.C(3). Floodways generally bar new fill, construction or other encroachment unless a registered engineer certifies no increase in flood levels, § 8.5.4.B(4). Critical facilities cannot be sited in the 100-year or 500-year floodplain at all, § 8.5.4.F. Variances go to the Board of Zoning Appeals, with further appeal to the Superior Court of Muscogee County, under § 8.5.4.1.