Practice Test Geeks(CFS) Certified Floodplain Surveyor Practice Test
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Technology & Digital Tools Flashcards

7 cards from real CFS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. A floodplain surveyor wants to assess changes in channel morphology over a 10-year period. Which remote sensing approach is most appropriate?

    Answer: Multi-temporal satellite imagery analysis

    Comparing satellite or aerial imagery from different dates (multi-temporal analysis) reveals planform channel changes, bank migration, and sediment deposition over time.

  2. In the context of Elevation Certificates, eBFE stands for:

    Answer: Estimated Base Flood Elevation

    eBFE refers to the Estimated Base Flood Elevation, used when a site-specific BFE has not been formally established through a FIRM study.

  3. Which coordinate reference system is mandatory for all FEMA National Flood Hazard Layer (NFHL) data submissions?

    Answer: NAD 83 geographic or state plane coordinates

    FEMA requires NFHL data to be referenced to NAD 83, using geographic or state plane coordinates depending on the delivery specification.

  4. Bathymetric LiDAR differs from topographic LiDAR in that it uses:

    Answer: Green (532 nm) laser pulses that penetrate shallow water

    Bathymetric LiDAR uses a green-wavelength laser (~532 nm) that can penetrate clear, shallow water to map underwater topography.

  5. When a surveyor submits a Letter of Map Amendment (LOMA) digitally through FEMA's eLOMA tool, the key advantage over paper submissions is:

    Answer: Faster processing with near-instant preliminary determinations for qualifying properties

    FEMA's eLOMA tool provides near-instant preliminary LOMA determinations for simple cases, dramatically reducing processing time compared to paper submissions.

  6. In a GIS flood model, Manning's n roughness values are typically applied using which spatial data layer?

    Answer: Land use / land cover raster or polygon layer

    Manning's n values are assigned to hydraulic model cells based on land use/land cover classifications derived from raster or vector polygon data.

  7. A UAV (drone) survey for floodplain mapping uses Structure-from-Motion (SfM) photogrammetry to produce which primary deliverable?

    Answer: Dense point cloud and orthomosaic imagery

    SfM processing of overlapping UAV imagery generates a dense 3D point cloud and a georeferenced orthomosaic, which can be used to create a high-resolution DEM.