Freeboard in a dam is the vertical distance between:
Choose the correct answer
Crest of dam and foundation
Full Reservoir Level (FRL) and top of dam (dam crest)
Maximum Water Level (MWL) and FRL
Spillway crest and dam crest
Correct Answer
B. Full Reservoir Level (FRL) and top of dam (dam crest)
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Freeboard = crest of dam - Maximum Water Level (MWL, which accounts for flood surcharge). Minimum freeboard is provided against wave action and seismic effects. IS 12169 recommends minimum freeboard = 1.5 x significant wave height above MWL.
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