Capable of being flooded or able to be covered with water.
From 'flood' (Old English 'flod' meaning a flowing of water) plus the suffix '-able' (capable of); a Modern English construction describing potential for inundation.
Urban planners now use 'floodable' to describe buildings designed to flood intentionally during extreme rainfall—the water fills a ground-floor room and then drains out, protecting the whole structure.
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