(iv) 50% of the individual total capacity of all tanks and
　spaces fitted to contain consumable liquids and stores is allowed for. It
　shall be assumed that for each type of liquid, at least one transverse
　pair or a single centreline tank has maximum free surface, and the tank or
　combination of tanks to be taken into account shall be those where the
　effect of free surfaces is the greatest; in each tank the centre of
　gravity of the contents shall be taken at the centre of volume of the
　tank. The remaining tanks shall be assumed either completely empty or
　completely filled,　and the distribution of consumable liquids between
　these tanks shall be effected so as obtain the greatest possible height
　above the keel for the centre of gravity.
　　　　　　　(v) At an angle of heel of not more than 5° in each
　compartment containing liquids,　as prescribed in (ii) except that in the
　case of compartments containing consumable fluids, as prescribed in (iv),
　the maximum free surface effect shall be taken into account.
　　　Alternatively, the actual free surface effects may be used, provided
　the methods of calculation are acceptable to the Administration.
　　　　　　　(vi) Weights shall be calculated on the basis of the following
　values for specific gravities:
　　　　　　　　　　　　salt water　　　　　　 1.025
　　　　　　　　　　　　fresh water　　　　　　1.000
　　　　　　　　　　　　oil fuel　　　　　　　 0.950
　　　　　　　　　　　　diesel oil　　　　　　 0.900
　　　　　　　　　　　　lubricating oil　　　　0.900　
　
　　　Damage assumptions
　　　(12) The following principles regarding the character of the assumed
　damage apply:
　　　(a) The vertical extent of damage in all cases is assumed to be from
　the base line upwards without limit.
　　　(b) The transverse extent of damage is equal to B/5 or 11.5 m,
　whichever is the lesser,　measured inboard from the side of the ship
　perpendicularly to the centreline at the level of the summer load
　waterline.
　　　(c) If damage of a lesser extent than specified in subparagraphs (a)
　and (b) results in a more severe condition, such lesser extent shall be
　assumed.
　　　(d) Except where otherwise required by paragraph (10) (a), the
　flooding shall be confined to a single compartment between adjacent
　transverse bulkheads provided the inner longitudinal boundary of the
　compartment is not in a position within the transverse extent of assumed
　damage. Transverse boundary bulkheads of wing tanks which do not extent
　over the full breadth of the ship shall be assumed not to be damaged,
　provided they extend beyond the transverse extent of assumed damage
　prescribed in subparagraph (b).
　　　If in a transverse bulkhead there are steps or recesses of not more
　than 3 m in length located within the transverse extent of assumed damage
　as defined in subparagraph (b), such transverse bul