ZONE B 1 : Area of 500-year flood; area subject to the 100-year flood with average depths of less than 1 foot or with contributing drainage area less than one square mile; and areas protected by levees from the base flood
Federal Emergency Management Agency, U.S. Department of Homeland Security, Acronyms Abbreviations &Terms (A Capability Assurance Job Aid), FEMA P-524, Washington, DC, USA 2009. http://www.fema.gov/pdf/plan/prepare/faatlist07_09 .pdf, (D&E - Amer) {844}