A contractor is building a house in a flood zone in Louisiana. The base flood elevation is 8 feet, and the lowest floor must be elevated 2 feet above base flood elevation. If the existing grade is 4 feet above sea level, what is the minimum elevation required for the lowest floor?
Correct Answer
D) 10 feet
The lowest floor must be at base flood elevation (8 feet) plus 2 feet of freeboard = 10 feet above sea level minimum elevation.
Why This Is the Correct Answer
The required lowest floor elevation is determined by the base flood elevation (BFE) plus any required freeboard, measured above sea level (the vertical datum). BFE = 8 feet above sea level. Required freeboard = 2 feet. Therefore minimum floor elevation = 8 + 2 = 10 feet above sea level. The existing grade of 4 feet is irrelevant to the calculation — it describes the existing ground level, not the required floor elevation. The floor must reach 10 feet regardless of grade.
Why the Other Options Are Wrong
Option A: 14 feet
14 feet results from incorrectly adding the grade (4 feet) + BFE (8 feet) + freeboard (2 feet). The grade does not factor into the minimum floor elevation formula; only BFE + freeboard determines the required elevation above sea level.
Option B: 12 feet
12 feet results from adding grade (4 feet) + BFE (8 feet), ignoring the freeboard requirement. This error omits the mandatory 2-foot freeboard above BFE that Louisiana requires.
Option C: 8 feet
8 feet is the BFE itself — the base flood elevation with no freeboard added. This would be the minimum under FEMA's basic NFIP requirement, but the question specifies that the lowest floor must be 2 feet ABOVE BFE, making the correct answer 10 feet, not 8.
Memory Technique
Flood elevation formula: BFE + Freeboard = Minimum Floor Elevation (above sea level). Ignore the grade in the calculation — the grade is the 'before,' the BFE + freeboard is the 'after.' 8 + 2 = 10 feet.
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