An accredited levee system is a system that Federal Emergency Management Agency (FEMA) has determined can be shown on a Flood Insurance Rate Map (FIRM) as providing a 100-year flood or greater level of flood protection. This determination is based on the submittal of data and documentation required by 44 CFR Section 65.10 which must be certified by a Professional Engineer. The area landward of an accredited levee system is shown as a moderate-risk area, labeled Zone X (shaded), on the DFIRM except for areas of residual flooding, such as ponding areas, which will be shown as high-risk areas, called Special Flood Hazard Areas (SFHAs). Flood insurance is not mandatory in Zone X (shaded) areas, but is mandatory in SFHAs. (http://www.fema.gov/media-library-data/20130726- 1600-20490-4180/lv_accredit_checklist_nov08.pdf)

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