By running a full matrix of simulations with all combinations of climatic, dredge and spill scenarios, we derived a complete envelope of possible impacts, taking the schedule risks out of the equation. Typically, we ran around 200 scenarios for each dredge plan investigated, to provide a full overview. But as these were relatively short and could be run in parallel on a large number of processors, we were able to carry out the simulation within a few days. The scenario approach provided added benefit as it readily identified critical dredge and climatic components. It was therefore effective for testing alternative dredge programmes and schedule optimisation.
The modelling approach and the development of new dredge scenarios as the project progressed were carried out in close collaboration with Chevron and design consultants. This close dialogue ensured that all parties were on the same page so that progress could be made expediently.