Case Analysis & Practical Application Flashcards

A floodplain surveyor is reviewing construction plans for a commercial building with a basement in Zone AE. The local ordinance requires lowest floor elevation at BFE. What guidance should the surveyor provide?

Answer: Under NFIP regulations, the basement floor is considered the lowest floor and must meet BFE, making the design non-compliant

Under NFIP, the basement floor is the lowest floor for elevation purposes, so any basement in Zone AE with a floor below BFE renders the structure non-compliant.

A surveyor is asked to evaluate a property where the FIRM shows a cross-hatched Zone AE overlay on a coastal barrier island. What is the significance of this designation?

Answer: It may indicate a Coastal Barrier Resources System unit where federal flood insurance is unavailable

Coastal Barrier Resources System (CBRS) units are identified on FIRMs, and federal flood insurance is generally unavailable for new construction in these areas.

After a major flood event, a community seeks a Flood Mitigation Assistance grant to elevate 20 repetitively flooded structures. As the surveyor supporting the application, what is your primary deliverable?

Answer: Elevation Certificates documenting the current lowest floor elevations relative to BFE for each structure

Elevation Certificates showing current lowest floor elevations are essential for grant applications to document existing conditions and calculate the scope of needed elevation work.

A surveyor is performing a Substantial Improvement analysis on a structure valued at $250,000. The proposed renovation cost is $130,000. The community's floodplain ordinance follows the NFIP 50% rule. What is the correct determination?

Answer: Substantial Improvement — renovation cost exceeds 50% of market value, requiring the structure to be brought into compliance

$130,000 is 52% of the $250,000 market value, which exceeds the 50% threshold, making this a Substantial Improvement requiring flood compliance.

A surveyor discovers that a bridge crossing a regulated floodway was built without a hydraulic analysis or CLOMR. The bridge abutments constrict the floodway. What is the likely regulatory consequence?

Answer: The community may be in violation of its NFIP floodplain management ordinance and could face probation or suspension

Unauthorized floodway encroachments can put the community in non-compliance with NFIP requirements, risking probation or suspension from the NFIP.

A property owner in Zone AE wants to construct a non-residential building that will be floodproofed rather than elevated. What must the surveyor provide to support this approach?

Answer: A Floodproofing Certificate certifying the building is designed and constructed to be watertight to at least BFE

Non-residential buildings may use dry floodproofing as an alternative to elevation, but a Floodproofing Certificate must certify the design meets NFIP requirements to BFE.

A riverine floodplain study uses a steady-state HEC-RAS model to establish BFEs. A surveyor reviewing the study notes that the study reach experiences significant backwater from tidal influence during storm events. What concern should the surveyor raise?

Answer: The steady-state model may not adequately capture dynamic tidal and riverine interaction, potentially underestimating BFEs

Tidally influenced reaches typically require unsteady-state (dynamic) modeling to accurately capture the interaction between river flows and tidal fluctuations.