Freeboard (1) The vertical distance between a design maximum water level and the top of a structure such as a channel, dike, floodwall, dam, or other control surface. The freeboard is a safety factor intended to accommodate the possible effect of unpredictable obstructions, such as ice accumulation and debris blockage, that could increase stages above the design water surface. (2) (Nautical) The distance between the water line and the uppermost full deck of a ship. For dams, the terms “net freeboard”, “dry freeboard”, “flood freeboard”, or “residual freeboard” refer to the vertical distance between the estimated maximum water level and the top of a dam. “Gross freeboard” or “total freeboard” is the vertical distance between the maximum planned controlled retention water level and the top of a dam. (3) (FEMA) A factor of safety expressed in feet above a design flood level for flood protective or control works. Freeboard is intended to allow for all of the uncertainties in analysis, design and construction which cannot be fully or readily considered in an analytical fashion.
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Author of the Water Words Dictionary source of text: Gary A. Horton
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