Spalding County, GA Environmental Rules: Flood Elevation Requirements (2026)

Section 2002 of the Spalding County Zoning Ordinance, Appendix IV, defines 'freeboard' as a factor of safety expressed in feet above a flood level that compensates for unknowns such as wave action and the hydrological effect of urbanizing a watershed. Section 2005(B)(1)(a) turns that concept into a hard number for the S-1 overlay: where base flood elevation data exist, new construction or a substantial improvement of any structure or manufactured home must have its lowest floor, including any basement, elevated no lower than one foot above the base flood elevation shown on the FEMA flood insurance rate map.

The same one-foot freeboard applies to mechanical systems under Section 2005(B)(1)(b), which requires heating and air conditioning equipment and components, including ductwork, to sit at or above that elevation. Builders who instead use solid foundation perimeter walls to raise a structure must add flood vents under Section 2005(A)(4): at least two openings totaling one square inch of net area for every square foot of enclosed space below the lowest floor, with the bottom of each opening no higher than one foot above grade, so hydrostatic pressure equalizes automatically during a flood.

That sub-floor enclosure can only be used for parking, limited storage, or entry to the elevated area, never finished living space. Non-residential buildings have a second path under Section 2005(B)(2): flood-proofing the structure watertight to one foot above the base flood elevation, certified by a registered professional engineer or architect. Compliance is verified twice, once at the application stage under Section 2004(B)(1) and again after construction under Section 2004(B)(2), when the permit holder must submit an as-built elevation certification prepared by a licensed surveyor or engineer before the zoning administrator signs off.