CFS Cheat Sheet 2026

The 30 highest-yield CFS facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What is the benefit of standardized digital reporting in Certified Floodplain Surveyor practice? → It ensures consistency, enables comparison, and facilitates compliance
2. A community wants to reduce flood risk by restoring a wetland in the floodplain. This approach is best classified as: → Nature-based solution (green infrastructure)
3. Which research framework is most appropriate for a floodplain study that aims to understand community residents' lived experiences during flood evacuation? → Interpretivist/phenomenological framework
4. Critical facilities in a floodplain risk assessment include which of the following? → Hospitals, emergency operations centers, and schools
5. Which FEMA product provides the official flood zone determination for a specific parcel when the FIRM panel boundary falls through the property? → Flood Zone Determination from a certified flood zone researcher
6. What is reflective practice in Certified Floodplain Surveyor professional growth? → Systematically examining experiences to gain insight and improve future practice
7. A surveyor establishes a benchmark network for a flood study using differential leveling. The allowable closure error for Third-Order leveling is: → ±12 mm √K
8. What is the regulatory significance of the 'Limit of Study' shown on some FIRM panels? → It indicates where detailed hydraulic analysis ends and approximate Zone A begins
9. Sea level rise projections are most critical for floodplain surveyors working in which type of zone? → Zone VE and AE coastal zones subject to tidal and storm surge flooding
10. When performing a Hydraulic Structure Analysis for a culvert, which condition typically controls the design water surface elevation? → Inlet control or outlet control, whichever produces the higher headwater elevation
11. Which mitigation measure is considered 'wet floodproofing'? → Allowing floodwaters to enter a structure with flood-resistant materials used below BFE
12. Which FEMA program gives NFIP policyholders in communities that adopt enhanced floodplain management measures a discount on flood insurance premiums? → Community Rating System (CRS)
13. Under the NFIP, the mandatory flood insurance purchase requirement applies to federally backed loans on buildings located in which areas? → Special Flood Hazard Areas (SFHAs) in NFIP-participating communities
14. Which tool within the ESRI ArcGIS environment is most commonly used for automated watershed delineation in floodplain studies? → ArcHydro toolset
15. Unlike a LOMR, a LOMA typically becomes effective: → Immediately upon FEMA's issuance of the determination
16. Which agency administers the NFIP? → Federal Emergency Management Agency (FEMA)
17. A Letter of Map Revision Based on Fill (LOMR-F) differs from a standard LOMR because it specifically addresses: → Lots or structures removed from the SFHA because of placement of fill material
18. In a LOMR (Letter of Map Revision) flood study, a surveyor must demonstrate that a proposed fill project does not cause more than how much rise in the BFE? → 1.0 foot (or the community's floodway encroachment standard)
19. When presenting an Elevation Certificate to a client with no technical background, which approach is most effective? → Use plain language analogies and focus on the flood risk implications relevant to them
20. What is the importance of data security in CFS digital applications? → Protecting sensitive information from unauthorized access and breaches is essential
21. Which type of NFIP claim payout covers the cost to repair or replace damaged structural elements of an insured building? → Building coverage
22. Which condition would trigger a mandatory QC re-survey of floodplain cross-sections according to standard surveying practice? → Closure error on a level loop exceeds the allowable tolerance
23. How often should risk assessments be reviewed in CFS practice? → At regular intervals and whenever significant changes occur
24. During a Letter of Map Amendment (LOMA) review, a surveyor finds that a property's lowest adjacent grade is 2 feet above the BFE. Which outcome is most likely? → FEMA will issue a LOMA removing the property from the Special Flood Hazard Area
25. When a culvert operates under inlet control, what factor primarily governs the flow capacity? → The geometry of the culvert entrance (headwater depth and inlet geometry)
26. When a surveyor submits an Elevation Certificate, what does Section C document? → Flood zone and BFE determination
27. Why is evidence-based practice important in Certified Floodplain Surveyor? → It integrates best available evidence with expertise for improved outcomes
28. When evaluating the external validity of a floodplain damage study conducted in coastal Louisiana, a CFS professional should consider whether: → Findings can be generalized to inland riverine floodplain settings
29. Which GPS technology is used for high accuracy in surveying? → Differential GPS (DGPS)
30. In HEC-HMS, the Soil Conservation Service (SCS) Curve Number method is used to estimate: → Rainfall-runoff transformation (excess precipitation)