NFIP Flood Studies & Maps CFM Exam Unit 3 Questions With Correct Answers

Base Flood - Answer 1% annual chance flood Base Flood Elevation (BFE) - Answer Computed elevation to which floodwater is anticipated to rise during the base (1% annual chance) flood Special Flood Hazard Area (SFHA) - Answer Area covered by the 1% annual chance floodplain The six SFHA zones: - Answer A, AE, AH, AO, V, VE Floodway - Answer Stream channel and that portion of the adjacent floodplain that must remain open to permit passage of the base flood The National Flood Insurance Act of 1967 directed the Federal Insurance Administation to: - Answer 1. Identify all floodprone areas in the US 2. Establish flood hazard zones in these areas FIS - Answer Flood Insurance Study FIRM - Answer Flood insurance rate maps Flood Insurance Study (FIS) - Answer Compilation and presentation of flood hazard data within a community Flood insurance study (FIS) includes: - Answer 1. A detailed report -a narrative describing the purpose of the study, historic floods, area studied, and engineering methods -various overview maps -tables summarizing flood hazard data and modeling outputs -flood profiles for various reoccurence probabilities 2. Flood maps -FIRMs -GIS data used to create the maps Each FEMA FIS goes through this process: - Answer 1. Assess community flooding issues 2. Finalize list of flooding sources to study 3. Estimate flood flows (amount of water) 4. Model flood interaction with physical environment 5. Produce flood elevations 6. Create flood elevation profiles (riverine only) 7. Map floodplain and floodway boundaries 8. Assign flood hazard zones 9. Produce Maps and FIS report 10. Release to communities Riverine studies include zones: - Answer A, AE, AH, AO, X Riverine studies include: - Answer All studies include an analysis of the amount of flood water within the watershed (hydrologics) and an analysis of how that water flows through the channel or floodplain (hydraulics). These are referred to as H&H analyses Hydrologics - Answer an analysis of the amount of flood water within the watershed Hydraulics - Answer an analysis of how the water within the watershed flows through the channel or floodplain Cross sections - Answer are taken at locations along the watercourse that are representative of local conditions. These are put into the H&H model