Oct. 12.] THE NEW ZEALAND GAZETTE. 3297

(6) The draught is the vertical distance from the top of keel amidships to the subdivision loadline in question.

(7) The permeability of a space is the percentage of that space which can be occupied by water.

The volume of a space which extends above the margin line shall be measured only to the height of that line.

(8) The machinery space is to be taken as extending from the top of keel to the margin line and between the extreme main transverse watertight bulkheads bounding the spaces devoted to the main and auxiliary propelling machinery, boilers when installed, and all permanent coal bunkers.

(9) Passenger spaces are those which are provided for the accommodation and use of passengers, excluding baggage, store, provisions and mail rooms.

For the purposes of Regulations III and IV, spaces provided below the margin line for the accommodation and use of the crew shall be regarded as passenger spaces.

(10) In all cases volumes shall be calculated to moulded lines.

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 consideration 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 without 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 permeability 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 (a—c/v), 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 uniform average permeability shall be taken as 5 greater than that given by the above formula.

(c) Where it is shown to the satisfaction of the Administration that the average permeability, as determined by detail calculation, is less than that given by the formula, the calculated value may be substituted. For the purposes of such calculation, the permeabilities of passenger spaces, as defined in Regulation I (9), shall be taken as 95, that of all cargo, coal, and store spaces as 60, and that of double bottom, oil fuel and other tanks at such values as may be approved in each case by the Administration.