Re-operation of large dams to improve the condition of regulated rivers: An integrated adaptive management approach (Mitta Mitta River, south-eastern Australia)

Flow regulation and water extraction have significantly modified the flow regimes of rivers throughout the world and have contributed to the decline in the biophysical condition of these rivers (Ward & Stanford 1995). To ameliorate this decline, environmental flows have been implemented, or are being considered for implementation in many rivers (Arthington et al 2006). However, in most regulated rivers only a small proportion of water is allocated for environmental purposes. To achieve a significant improvement in the condition of regulated rivers it is essential that consumptive water is also released from dams in a way that achieves environmental benefits at the same time as meeting supply requirements. The challenge for river managers is to alter the operation of dams and weirs to deliver environmental benefits at the same time sustain the industries and communities that rely on water from these systems.