FEMA flood zone rules in Hamilton County, IN — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Indiana Code 14-28-1 requires DNR Division of Water permits for any construction, fill, or excavation in a regulated floodway. The state authority preempts local approvals for floodway encroachments.
Under IC 14-28-1 (the Flood Control Act), no person may construct an abode, residence, building, structure, or place fill within or on the floodway of a river, stream, or lake without first obtaining a DNR permit. Floodway boundaries are determined by the regulatory flood, defined as the 100-year event. Applicants must demonstrate the project will not cause unreasonable hazard, harmful interference, or unreasonable detrimental effect on flood heights. Local floodplain ordinances exist under the National Flood Insurance Program and IC 14-28-4, but DNR retains exclusive jurisdiction over floodway encroachments and may override local approvals.
Building in a floodway without a DNR permit is a Class C infraction with daily continuing penalties, mandatory removal of unauthorized structures, and ineligibility for federal flood insurance.
See how Hamilton County's flood zones rules stack up against other locations.
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