The region proposed for the SE Augmentation is currently serviced by three Tasmanian Irrigation (TI) schemes summarised below.
South East 1 (SE1) services irrigators by riparian delivery into the Coal River from Craigbourne Dam.
South East 2 (SE2) takes water from either a TasWater potable supply or through riparian release from Craigbourne Dam into the Coal River and pumping from Richmond into Daisy Banks Dam.
South East 3 (SE3) is supplied exclusively potable water from Taswater with an offtake located near Granton.
There is increasing demand within the region and the current schemes currently lack the capacity to cater for continued growth, there are ongoing concerns about the availability and cost of water from TasWater and there are some concerns around water quality for water sourced from the Coal River.
The Coal River Valley incorporates a large number of generally small land holdings that typically provide a range of high value agricultural products. Typical land use in the area is for viticulture, fresh fruit and vegetables and other high value crop types. The upgrade of the existing schemes will provide for improved reliability of supply, open additional land for irrigation activity, an increase in total irrigated area and will further improve the agricultural potential for the district. This would allow for possible changes in agricultural activity and an increase in the irrigated land within the district.
The proposed augmentation is to pump raw water (50% of the current TI Derwent water licenses) direct from the Derwent River into existing SE3 pipeline near Granton which will require construction of a boost pump station adjacent to the existing TasWater Bryn Estyn raw water intake pump station and a 19.2km linking pipeline.
This will mean that for much of the time potable water from TasWater with its associated cost will not be required with the exception of periods at peak demand.
The project also includes a 7.5 km pipeline from the Tea Tree Road Pump Station along Middle Tea Tree Road into Daisy Banks Dam this will allow for the interconnection of SE2 with SE3.