A continuing period of climate variability affecting the south west of Western Australia has seen a 12% decrease in rainfall reduce streamflow to Perth's water supply dams by 50% during the last 27 years. A change in organisational arrangements and an evaluation of risk exposure were key triggers for the implementation of plans to restore the public drinking water supply reliability. The Water Corporation mobilised the support of customers and regulators during the recovery period. Poor and extremely low inflow events during the last five years required additional planning, regulator support and implementation strategies to minimise the impact on the Perth Community.

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