FEMA flood zone rules in Indianapolis, IN — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Indianapolis-Marion County enforces floodplain regulations under Rev. Code Chapter 565, adopting FEMA Flood Insurance Rate Maps. Significant portions of the county lie within FEMA-designated flood zones along the White River, Fall Creek, Eagle Creek, and Pleasant Run. New construction in the Special Flood Hazard Area must elevate the lowest floor at least two feet above the base flood elevation. A floodplain development permit is required before any construction or fill in the floodplain.
Indianapolis Code Ch. 565 governs floodplain management. The Flood Control Districts Zoning Ordinance (available on Indy Data Portal) maps SFHA boundaries. Indiana DNR administers the state floodplain program. Development in SFHA requires: floodplain development permit, elevation to or above BFE (typically BFE + 1 ft for residential), and prohibition on construction in floodways. Eagle Creek reservoir and the White River are primary flood vectors. Indiana participates in NFIP — flood insurance required for federally backed mortgages in SFHA.
Construction below flood elevation: retroactive compliance required, fines $500 to $5,000. Floodway encroachment: removal order. Failure to maintain flood insurance: lender force-placement at higher cost.
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