All MCD levees in Miami, Warren and Butler counties have received accreditation under the new requirements. Levees in Montgomery County were accredited under a previous program and have not been slated for reaccreditation yet.
Over the last several years, FEMA updated its Flood Insurance Rate Maps (FIRMs) from paper maps to Digital Flood Insurance Rate Maps (DFIRMs). Insurance companies set their rates based on these maps. Local communities use the DFIRMs for floodplain development enforcement.
This map modernization was done on a county-by-county basis. For the updated DFIRMs to recognize levees as providing flood protection to the communities, the levees must be certified by their owner and accredited by FEMA.
The levees must show they can withstand a 100-year flood, which means an event that has a 1-percent chance of occurring in any given year. FEMA refers to this event as the Base Flood. The levee accreditation requirements are spelled out in the Code of Federal Regulations (CFR) 44-65.10.
Accreditation is not a guarantee of performance. It is intended to provide updated information for insurance and floodplain development purposes.
| Fact Sheet: Requirements for Mapping Levees (100KB) |