21.6 Other surface water liability increases

Supporting information

The volume for this line item is 0 ML.

The Sydney Catchment Authority manages banked environmental flow in the Sydney region.

Between 1 June 2005 and 3 March 2008, environmental flow releases into the Hawkesbury and Nepean rivers required under the Sydney Catchment Authority's water management licence were halved as directed by the minister responsible for water in New South Wales due to the continuing drought. A condition of halving the flows was that the Sydney Catchment Authority would maintain a rolling 12-month bank in storage reservoirs and release the banked water as directed by the minister. As a result of reservoir spills that occurred during flooding in March 2012, the water recorded as being in the bank was deleted and therefore the surface water liability in the 2012–13 year was 0 ML.

Quantification approach

Data source

The Sydney Catchment Authority and the New South Wales Office of Water agreement; Sydney Catchment Authority database of daily requirements and releases, Sydney Catchment Authority compliance reporting to the New South Wales Office of Water.

Provided by

Sydney Catchment Authority.


The volume stated for this line item is based on agreements between the Sydney Catchment Authority and New South Wales Office of Water.

Assumptions, limitations, caveats and approximations


Uncertainty information

The uncertainty was not quantified.