TREATIES Floodable length. REGULATION II. Floodable Length. (1.) The floodable length at any point of the length of a ship shall be determined by a method of calculation which takes into consid- eration the form, draught and other characteristics of the ship in question. (2.) In a ship with a continuous bulkhead deck, the floodable length at a given point is the maximum portion of the length of the ship, having its centre at the point in question, which can be flooded under the definite assumptions hereafter set forth in Regulation III with- out the ship being submerged beyond the margin line. (3.) In the case of a ship not having a continuous bulkhead deck, the floodable length at any point may be determined to an assumed continuous margin line, up to which, having regard to sinkage and trim after damage, the sides of the ship and the bulkheads concerned are carried watertight. REGULATION III. Permeability. (1.) The definite assumptions referred to in Regulation II relate to the permeabilities of the spaces below the margin line. In determining the floodable length, a uniform average permea- bility shall be used throughout the whole length of each of the following portions of the ship below the margin line:- (a) the machinery space as defined in Regulation I (8); (b) the portion forward of the machinery space; and (c) the portion abaft the machinery space. (2.) -(a.) For steamships the uniform average permeability throughout the machinery space shall be determined from the formula- 80+12-5 (ac), where a=volume of the passenger spaces, as defined in Regulation I (9), which are situated below the margin line within the limits of the machinery space. c=volume of between deck spaces below the margin line within the limits of the machinery space which are appropriated to cargo, coal or stores. v=whole volume of the machinery space below the margin line. (b.) For ships propelled by internal combustion engines, the uni- form average permeability shall be taken as 5 greater than that given by the above formula. Permeability. 1190
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