This is because in big ships, the equivalent weight can be added by admitting sea water to wing compartments on the high side as counter-flooding.
Kungenxa yokuba inqanawa ezinkulu, ubunzima obulinganayo bungongezwa ngokuvumela amanzi olwandle abhabhise ikhompatimenti kwicala eliphakamileyo ngokuchasane nokhukuliso.