Sydney

The estimated diversions by individuals with stock and domestic water licenses in the Sydney region for 2009–10 was 938 ML.

Data source

Draft water sharing plan—Greater metropolitan unregulated river water sources and water use records in the spreadsheets managed by licensing field officers of the NSW Office of Water.

Data provider

The NSW Office of Water.

Method

Water use was estimated by applying a 40% entitlement-use factor for 2009–10 to the total entitlement value for the category. The entitlement-use factor is based on advice from the NSW Office of Water regional licensing officers who have access to some metered figures in the Hawkesbury region.

Uncertainty

The volume was estimated. Estimated uncertainty is +/–30% to +/–50% based on professional judgment and established practice within the NSW Office of Water.

Approximations, assumptions, caveats/limitations

The calculation method is applied only to the categories of ‘Individual holder for stock and domestic’ and ‘Other lumped holders’ from unregulated flow for 2009–10. While the metered area (used to calculate entitlement-use factor) represents only a portion of the Sydney region, it was deemed appropriate to assume the same proportion of use for the remaining area.