Ballast Water Management Decision Support System - Global Maritime Transport and Ballast Water Management: Issues and Solutions - page 242

Fig. 12 BWM process (Enhanced after David 2007 ) (This fi gure can be downloaded from http://
extras.springer.com/ )
Decision 5: What Are Ballast Water Management Options
and Consequences?
Retaining ballast water on board the vessel is considered as the fi rst BWM option.
This is only a feasible option for some vessel types with smaller ballast water capac-
ity and especially in cases when vessels are only partially loading. If necessary the
vessel might manage it by pumping ballast water from one tank to another without
any discharge to the port. If this cannot be done, that ballast water would need to be
managed.
If a vessel is capable of managing ballast water according to the BWM Convention
D-2 standard, then it does so and is clear to proceed. If a vessel does not have
BWMS installed, then BWE would need to be conducted as minimum BWM measure.