Opposition parties say building more dams is not going to solve the underlying cause of climate change.
A new report by the Intergovernmental Panel on Climate Change forecasts an increased risk of drought and heat waves globally.
Federated Farmers suggests building more water-storage facilities is a way to stave off the effects of an increase in droughts.
But Labour and the Green Party say building more dams would just mask the problem. They say greenhouse gas emissions need to be reduced as a first step.