Snowy Hydro complied with its obligation to target Snowy Montane Rivers releases for Environmental purposes during the 2015–16 water year.
The Snowy Montane Rivers include all rivers within the Snowy Water Catchment Area including the Upper Murrumbidgee River immediately below Tantangara Dam but excluding the Snowy River, the Mowamba River and Cobbon Creek.
During the 2015–16 water year, Snowy Hydro was directed to make Snowy Montane Rivers Increased Flows (SMRIF) from the following locations:
- Tantangara Dam to the Murrumbidgee River,
- Goodradigbee Aqueduct to the Goodradigbee River (a tributary of the Murrumbidgee River),
- Middle Creek Aqueduct to Middle Creek (a tributary of the Geehi River); and
- Bar Ridge and Diggers Creek Aqueducts to Tolbar Creek and Diggers Creek respectively (tributaries of the Snowy River).
The target volume for Snowy Montane Rivers Increased Flows totalled 64.2 GL, with 15.8 GL from Tantangara Dam, 12.0 GL from Goodradigbee Aqueduct, 17.5 GL from Middle Creek, and 18.9 GL from Bar Ridge and Diggers Creek Aqueducts, all to be targeted over the water year.
The total actual montane release volume was 47.4 GL. This was made up of 15.7 GL from Tantangara Dam, 7.4 GL from Goodradigbee Aqueduct, 10.1 GL from Middle Creek Aqueduct and 13.8 GL from Bar Ridge and Diggers Creek Aqueducts, released over the water year.
The comparison of the annual, monthly and daily release targets for the Snowy Montane Rivers Increased Flows against the actual from Tantangara Dam is set out in the graphs opposite. All daily, monthly and annual release targets were within the compliance limits.
Monthly releases from Goodradigbee, Middle Creek, Bar Ridge and Diggers Creek are also provided below. As these releases are made from small catchments and the inflows (and therefore releases) cannot be predicted or controlled, there are no annual compliance targets for these releases. The above/below target delivery of water in these catchments in 2015-16 reflects the inflows received in these locations. In years when inflows are above average, above average volumes of water will be delivered to these catchments and vice versa.