Ballast Water Management Decision Support System Model Application - Global Maritime Transport and Ballast Water Management: Issues and Solutions - page 284

as extreme risk would be still discharged unmanaged (see Table 10 ). As in the previous
approach, without conducting BWRA this would be the actual ballast water discharge
situation, but the risk posed would remain unknown.

Application of the Proposed Decision Support System Model
with the Designated Ballast Water Discharge Area

In general, as a result of the DSS model implementation, all 63 vessels studied were
identifi ed as able to conduct BWE under different levels of BWM requirements
which would have been selected according to the level of risk assessed per each
vessel ballast water discharge. These represent 14.06 % of all vessels that discharged
ballast water in the Port of Koper in 2005, and 100 % of those with a source port in
the BWM relevant area. All 64,754 m 3 of ballast water discharged originating from
source ports in the BWM relevant area could have been managed. This represents
11.90 % of all ballast water discharged in the Port of Koper in 2005 (see Table 11 ).
Here below the application of the proposed DSS model is also to be seen in view
of the results according to the end-points of the BWM DSS.

Vessels Turned Away Because They Have Not Submitted Required Data

Based on data of the Port of Koper PSA, 2,368 vessels entered Slovenia in 2005, and
989 of these did not submit BWRF. According to the BWM DSS, as this is a port
entry requirement, these could be understood as to be “turned away”. At the time of
this study the submission of BWRF was not legally binding, but for an effi cient
implementation of a selective BWM approach supported by BWM DSS, reporting in
advance on ballast water operations need to be a port entry requirement.
None of the vessels studied, however, could be simulated as a “turned away” case
since this study was based on vessels that have submitted BWRF with relevant
(critical) data on ballast water intended to be discharged in the Port of Koper.

Table 11 Result of the implementation of the BWM DSS model

Vessels BW discharged (m 3 )

Nr. Vessels BWM 63 BW BWM 64,754

Nr. vessels no BWM 0 BW no BWM 0

Nr. vessels from BWM relevant area 63 BW discharge from BWM relevant area 64,754

Total Nr. 2005 448 Total BW discharge 2005 544,133

% BWM / BWM relevant area 100 % BWM / BWM relevant area 100

% BWM / Total 2005 14.06 % BWM / Total 2005 11.90

Delay OK 14 RA high untreated 0

Undue delay 0 RA extreme untreated 0

Undue delay RA OK 8

Enhanced after David ( 2007 )