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From Narciki
Floodable Length
Floodable length, or subdivision requirements, specify a number of compartments for which a ship must be able to sustain flooding of and remain afloat. Subdivision requirements are subject to IMO, classification, and flag state regulations. A factor of subdivision is calculated for the ship, describing the number of compartments which would be bilged or flooded. A floodable lengths curve is calculated, inclusive of allowable permeabilities, either in order to place subdivision bulkheads or verify their compliance.