The results from the conceptual model indicated that increases in ecological score can be achieved with relatively small changes in total irrigation diversion (analogous to reduced licence volumes) (Figure 3a). For example, the environmental score was doubled from 34 to 68 by decreasing the total irrigator diversion by <2%. This outcome is consistent with that found by Dittmann et al (2009), where a small reduction in water supply to extractive users achieved an improved match between releases and natural flows. The relative trade-off between objectives also varies along the curve. For example, once the environmental score increases above 120, there is a greater reduction in total diversions compared with changes in lower environmental scores.
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