Focusing on the 2 objective scenario, the licence volume for the three irrigators also had different effects on the total environmental health score (Figure 3c). Irrigator 1 had a relatively small impact (all decision variable values were >90% of the possible maximum licence volume), whereas licence volumes of >80% for Irrigator 3 had a higher chance of resulting in a reduction in environmental score. The environmental score was relatively insensitive to Irrigator 2’s licence volume except for high environmental scores of >150. However, there are a limited number of data points from which these conclusions can be drawn.