Your browser version is outdated. We recommend that you update your browser to the latest version.

Flood Plain

The Federal Emergency Management Agency (FEMA) established the 100-year flood plain in order to control construction within a flood plain. FEMA established their own set of reference marks to determine the flood plain elevation and these same reference marks, which differ from local city and county benchmarks, must be used when completing flood plain delineation. A bench circuit must be completed in order to establish the elevation of the site in comparison to a FEMA reference mark, even if there is a local city or county benchmark adjacent to the site and the nearest FEMA reference mark is a half-mile or more away.