Initial draughts of the ship before damage which must be considered when calculating the attained subdivision index A.
- Deepest subdivision draught (ds) is the waterline which corresponds to the summer load line draught of the ship.
- Light service draught (dl) is the service draught corresponding to the ballast arrival condition with 10% consumables for cargo ships. For passenger ship it corresponds, in general, to the arrival condition with 10% consumables, a full complement of passengers and crew and their effects, and ballast necessary for stability and trim.
- Partial subdivision draught (dp) is the light service draught plus 60% of the difference between the light service draught and the deepest subdivision draught.
See also Damage stability calculations.