The following chart illustrates the level of risk associated with spills of three sizes (a hundred tonnes, a thousand tonnes and five thousand tonnes). The key observation is that for all regions, total risk is driven strongly by the smaller sized spills (note that the hundred tonne risk axis (range = 0 to 3.4) is to the right whilst the thousand and five thousand tonne risk axis (range = 0 to .9) is to the left).
