Moora Moora Reservoir and Rocklands Reservoir are Wimmera-Mallee System Headworks water storages in the Glenelg River system that contribute to the supply of water to towns and properties across the Wimmera, Mallee, Glenelg, Loddon, and Avoca catchments. Water for the environment is actively managed in the Glenelg River below Rocklands Reservoir. There are passing flow rules for the Glenelg River and upper Wannon River.
The priority reaches of the Glenelg River for deliveries of water for the environment are:
- Rocklands Reservoir to 5-Mile Outlet (reach 1a)
- 5-Mile Outlet to the confluence with the Chetwynd River (reach 1b)
- Chetwynd River to the Wannon River (reach 2)
- Wannon River to the tidal extent just below the confluence with Crawford River (reach 3)
Water for the environment in the Glenelg system is released from Rocklands Reservoir for reach 1a via the reservoir wall outlet and for reaches 1b, 2, and 3 via the 5-Mile and 12-Mile outlets.
The Glenelg River estuary benefits from releases of water for the environment to upstream reaches, but releases do not currently target the estuary. The Glenelg Hopkins CMA has investigated the importance of water for the environment in the Glenelg River estuary, listed as a heritage river reach and a site of international significance under the Ramsar Convention. Environmental flows provide landscape-scale benefits that support estuarine values.
Proportions of water entitlements in the Wimmera-Mallee System Headworks held by private users, water corporations and environmental water holders on 30 June 2020