Division .1.6.2 Where the freeboard is such that the edge of the bulkhead deck is immersed when the ship heels 5 ° or less, the drainage of the enclosed cargo spaces on the bulkhead deck shall be led to a suitable space, or spaces, of adequate capacity, having high water level alarm and provided with suitable arrangements for discharge overboard. In addition it will be ensured that:F1

the number, size and disposition of the scuppers are such as to prevent unreasonable accumulation of free water;

the pumping arrangements required by this Regulation take account of the requirements for any fixed pressure water spraying fire-extinguishing system;

water contaminated with petrol or other dangerous substances is not drained to machinery spaces or other spaces where sources of ignition may be present; and

where the enclosed cargo space is protected by a carbon dioxide fire-extinguishing system the deck scuppers are fitted with means to prevent the escape of the smothering gas.