Warragamba Dam is set to jump above 50 per cent capacity due to heavy rainfall, which means that the implementation of a plan by the NSW government to double the capacity of the Sydney Desalination Plant could be delayed.

Earlier this year, NSW Water Minister Melinda Pavey directed the operators of the plant to prepare for an expansion “as quickly as practicable” in the context of drought and fast-dropping dam levels.

However the $1 billion project will only proceed from the planning to action stages should dam levels hit certain “trigger points”.

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