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What does Freeboard refer to in floodplain management?
The length of a bridge over water
A board used to measure flood depth
The height above BFE for safety margin in structure elevation
The width of a river at its widest point
The correct answer is: The height above BFE for safety margin in structure elevation
Freeboard refers to the vertical distance between the base flood elevation (BFE) and the bottom of a structure's lowest floor. Option A, the length of a bridge over water, is not relevant to floodplain management. Option B, a board used to measure flood depth, is a tool and not a concept related to floodplain management. Option D, the width of a river at its widest point, is not a measure used in floodplain management. Therefore, the correct answer is C as it accurately describes the meaning of freeboard in the context of floodplain management.