Clark County, IN Environmental Rules: Flood Elevation Requirements (2026)

061(B) requires new construction or substantial improvement of any residential structure or manufactured home in a Special Flood Hazard Area to have its lowest floor, including any basement, at or above the Flood Protection Grade, defined elsewhere in the chapter as two feet above the base flood elevation. 061(C) applies the same two-foot freeboard standard to commercial, industrial and other non-residential structures, which may instead be floodproofed to or above that elevation if a registered engineer or architect certifies the design is watertight and can resist the regulatory flood.

The building protection requirement in (A) is triggered by new structures over 400 square feet, additions or improvements worth 50% or more of the structure's value, repairs restoring flood-damaged structures worth 50% or more of pre-damage value, and installation of manufactured homes, travel trailers, or recreational vehicles staying more than 180 days. 026, which ties the county's regulatory flood elevations to the 1% annual chance flood profiles in the Flood Insurance Study of Clark County, Indiana and Incorporated Areas and the FEMA Flood Insurance Rate Map dated April 16, 2014, as updated.

Elevated structures with enclosed areas below the Flood Protection Grade must, under (D), include at least two flood vents in two different exterior walls sized to at least one square inch per square foot of enclosed area, with openings no more than a foot above grade. 046(B) and (C) before construction can proceed past the framing stage.