Daly
17.6 Surface water diversions – other statutory rights

Supporting information

The volume recognised in the water accounting statements (4,338 ML) represents the volume of surface water diverted under other statutory rights in the Daly region during the 2011–12 year.

These diversions are made by individual users for stock and domestic purposes. Total volume of diversions from each surface water resource within the Daly region during the 2011–12 year are shown in the table below.

 

Volume of water diverted under statutory rights for each surface water resource within the Daly region during the 2011–12 year

Surface water resource

Water diverted (ML)

Daly River

1,031

Douglas River

268

Edith River

215

Fergusson River

435

Flora River

382

Katherine River

1,384

King River

623

Total

4,338

 

Quantification approach

Data source

Department of Land Resource Management, Hydstra database and water allocation plans; Department of Primary Industries and Fisheries, stock information.

Provided by

Department of Land Resource Management and Department of Primary Industries and Fisheries.

Method

The volume presented for this line item is an estimate. Stock and domestic use was estimated based on property area around each of the major rivers within the Daly catchment (see table in 'Supporting information') and a stock and domestic use factor.

The property area was assumed to equal the length of each river by an 8km wide buffer.

Based on best practice, stocking rates and daily stock water needs, as recommended by the Department of Primary Industries and Fisheries, total stock use was assumed to equal 0.2 ML/year/km2 for each river. Based on average metered water use by domestic water users in the region as part of a voluntary bore–metering project conducted in 2008, the total domestic use was assumed to equal 5.5 ML/year/km2 for each river.

Total volume of water diverted is calculated by multiplying the estimated property area by the stock and domestic use factors.

Assumptions, limitations, caveats and approximations

There is not sufficient information relating to actual diversion to provide more accurate estimates of diversions by individual users under statutory rights. The entire volume diverted by individual users is based on estimated data.

Uncertainty information

The uncertainty is unquantified.