Climate change, mitigation and adaptation: the case of the Murray–Darling Basin in Australia



Table 3: State-contingent water use (GL)

Simulation      Year

Horticulture

Broadacre

Irrigation
in all
states

Irrigation
in Wet and
Normal
states

Irrigation
in all
states

Irrigation
in Wet and
Normal
states_____

Irrigation
in Wet
state only

Baseline

2000

1,507

_______0

7,302

2,089

766

Adaptation only

2050

1,101

259

2,788

3,007

________0

2100

_______0

811

______0

2,050

________0

Mitigation and
adaptation

(Environment residual)

2050

1,504

_______0

6,693

1,872

926

2100

1,504

_______0

6,565

1,897

864

Mitigation and
adaptation

(Environment priority)

2050

1,504

_______0

4,845

1,317

507

2100

1,504

_______0

4,571

1,303

488

More detailed results on the allocation of land and water between crops and
regions are available as an Appendix from the authors. These results show that,
in the ‘adaptation only’ scenario, the focus of horticultural production shifts
from citrus and grapes (high value commodites that require irrigation in all
states) to a vegetable production activity using irrigation to produce tomatoes in
Normal and Wet states and producing rockmelons without irrigation in Drought
states.

higher than modelled here, as additional irrigation is needed to flush the salt away from the root
zones. This extra water requirement may lead to further adjustment towards opportunity
cropping.

22



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