Picture: Lake Fyans

Review of October 2017 Operations

Around 3,000 Megalitres (ML) of measurable inflow was observed to reservoirs during October, which is around 11% of the historic average for the month (28,100 ML). Between July and October 66,550 ML of inflow has been recorded into headworks storages, which is around 44% of the historic average for the same period (150,400 ML).

During October, the volume in headworks reservoirs decreased from 367,690 (65.7%) to 364,290 (64.9%).

Rainfall was close to median at most reservoirs during October, with totals ranging from 65mm at Lake Bellfield to 25 mm at Toolondo reservoir.

No target filling curve releases were made from any reservoirs during October.

Regulated environmental releases from Lake Wartook continued during October with 467 ML delivered to the MacKenzie River. Delivery of passing flow commitments were ongoing from Lake Lonsdale with 941 ML delivered to the lower Mt William Creek. There was 1,284 ML passing flow released from Rocklands Reservoir to the Glenelg River during the month.

Wimmera-Mallee Pipeline supplied Recreation Lakes received 221 ML during the month, and 78 ML was delivered to the wetlands within the Mallee and Wimmera Catchment Management Authority areas.

Consumptive entitlement holders collectively used 1,145 ML during October to supply urban and rural system demands.

Net evaporation from reservoirs was approximately 2,300 ML for the month; with evaporation exceeding rainfall, (Net evaporation considers rainfall on the reservoir as an evaporation offset.).

 

Planned November 2017 Operations

The Bureau of Meteorology in their most recent climate outlook predict a 50% chance of above average rainfall this November. The The El Niño Southern Oscillation (ENSO) is currently neutral. In coming months, the Pacific Ocean is likely to continue cooling towards La Niña thresholds, and as a result, a ‘La Niña watch’ has been issued. Predictions suggest that due to competing climate influences, widespread rainfall as a result of a La Niña event is unlikely.

No water transfers are currently planned for November, however the Storage Manager will continue to monitor conditions. Should significant rainfall occur during November, the Storage Manager may consider further water transfers where these will achieve operational efficiency and are consistent with the Annual Operating Plan. Further information in relation to water transfers are described in the Storage Manager’s Annual Operating Plan.

Without substantial rainfall, the routine delivery of water to consumptive entitlement holders is expected to be the Storage Manager’s operational focus during November.

Reservoirs are expected to remain at suitable levels through November for a range of recreational activities, including boating at reservoirs where this is permitted. Please refer to the Reservoir Level information page for further information on water levels and recreation activities permitted at each reservoir.