In new tankers, the design of spill trays should be such
that the surface of any liquid in the spill tray is reduced to the
minimum extent possible and thus the evaporation minimized. One way
of achieving this could be by designing spill trays with sloping sides.
Other constructions with similar effect may also be acceptable. Drainage
facilities for the spill trays and the disposal of their content should
be installed (e.g., slop tanks and disposal arrangements).