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In page Water security in Australia:

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A major boundary which affects effective water management is the highly variable precipitation levels of Australia – Australian rainfall is more variable than rainfall in the rest of the world since it is driven by the Southern Oscillation rather than by seasonal changes.[1] The result is that for the same level of reliability of supply, dams in Australia need to be six times as large as those in Europe and twice as large as the world average to ensure water sources do not run dry during dry seasons[citation needed].