Designates areas where the annual probability of flooding is less than 0.2 percent. Zone C is provided on older flood maps, on newer maps this is referred to as "unshaded Zone X"
Coastal Construction Manual: Principles and Practices of Planning, Sitting, Designing, Constructing, and Maintaining Residential Buildings in Coastal Areas (Fourth Edition), Glossary, FEMA P-55 / Volume II, Washington, DC, USA 2011. http://www.fema.gov/media-library-data/20130726-15 10-20490-1986/fema55_volii_combined_rev.pdf, (CoaStormEmr - Amer) {887}