17.2 River outflow from the region
The volumetric value for the line item for the whole region for the 2011–12 year was 9,565,600 ML. This volume was the river outflow from South Australian Murray sustainable diversion limit (SDL) area to the sea estimated at the barrages.
The same volume applies as the river outflow from the Southern Basin. The river outflows from the Northern Basin into the Southern Basin were 4,547,315 ML. This was the inflow from the Barwon–Darling Watercourse SDL area into the Lower Darling SDL area calculated at the upstream end of Menindee Lakes.
Murray–Darling Basin Authority: (a) flows through the barrages were sourced from HYDRO database, and (b) flows into Menindee Lakes from the Barwon–Darling watercourse were sourced from water audit monitoring data received from New South Wales (22 January 2013) and stored in the HYDRO database.
Bureau of Meteorology (the Bureau) and Murray–Darling Basin Authority.
Flows into Menindee Lakes from the Barwon–Darling watercourse were based on metered discharge data and subsequent calculations.
Flows through the barrages were estimated based on the number of barrages open, the duration of their opening and the flow rates across the barrages.
Assumptions, limitations, caveats and approximations
Availability of updated information resulted in the restatement of the 2010–11 year volume. The flows through the barrages were updated for the 2010–11 year resulting 10,025 ML decrease to the volume reported in the 2011 Account. The change applies only to the Southern Basin.