FAQs for Engineers, Surveyors & Architects

Floodplain Management

Expand/Contract Questions and Answers

  • How long does it take to obtain a Letter of Map Amendment (LOMA) or a Letter of Map Revision Based on Fill (LOMR-F)?
  • Which elevation datum should I use?
  • What is the Base Flood Elevation?
  • What is the base, or 1-percent-annual-chance, flood?
  • What are the different flood insurance risk zone designations and what do they mean?
  • What are the different types of Letters of Map Change (LOMCs)?
  • I plan to request a map update or revision. What are my options and where can I obtain more information?
  • How do I find out when a Flood Insurance Rate Map (FIRM) was last updated?
  • Why are temporary benchmarks included on some Flood Insurance Rate Maps (FIRMs) and not on others?
  • Where can I view or obtain a copy of a Flood Insurance Rate Map (FIRM) or Flood Insurance Study (FIS) report?
  • How do I determine whether a hydrologic and hydraulic model is accepted for use by the National Flood Insurance Program (NFIP)?
  • Who can prepare an Elevation Certificate?
  • When should a Conditional Map Revision be requested?
  • When should I request a revision to a Flood Insurance Rate Map (FIRM)?
  • What are the FEMA requirements for removing a structure from the Special Flood Hazard Area (SFHA)?
  • Where can I obtain the backup or supporting data for a Flood Insurance Study (FIS)?
  • How do I determine a Base Flood Elevation (BFE) for an approximate Zone A area?