Daly
17.12 Entitled diversion of allocated surface water to urban water system

The volume recognised in the water accounting statements of 2,454 ML represents the volume of water diverted for urban water supply in the Daly region during the 2012–13 year.

Total surface water diverted from each surface water resource for urban water supply in the Daly region during the 2012–13 year is given in the following table.

¹Volume based on metered and estimated data (see 'Quantification approach')

Water Resource Licensing database and meter readings from licensees.

The Department of Land Resource Management (The Department).

The volume presented for this line item is a combination of metered data and estimates.

There are two separate licences for water supply to Katherine. The allocated diversion for one licence was based on metered data (approximately 98% of the volume) and the other was based on estimated data.

Where metered data are available, the abstraction is calculated as the actual abstraction during the 2012–13 year. Metered data are supplied to the Department on a monthly basis. Where metered data are not available, the volume of diversion is estimated to be the full annual allocation.

Less than 2% of the total volume of surface water diverted for Katherine supply was based on estimated data. The estimated abstraction is assumed to equal the full annual allocation, and that the rate of abstraction is uniform throughout the year. It is unlikely on both counts that this will be the case for this licence.

Expected error for water meters is +/– 2%.

The Department requires that all water meters, when tested under in situ conditions, must be within 2% accuracy across the full flow rate range. See the Department's Water meters fact sheet for more information.

For estimated data the uncertainty is unquantified.