The Macquarie River has been rising at Dubbo as WaterNSW releases water from the flood mitigation zone of Burrendong Dam.
Burrendong Dam is currently at 100.8 per cent of capacity after reaching 103.1 per cent on September 9.
The dam is at 100 per cent of capacity when water laps the bottom of its six-metre-high spill gates.
Its flood mitigation zone sits within the spill gates and can take the dam to 142 per cent of capacity.
WaterNSW reports rain events across winter and this spring generated inflows which increased the dam's storage level from about 60 per cent of capacity in June.
"The dam storage level has risen into the flood mitigation zone throughout September and October," its spokesman said.
"Burrendong Dam is currently at approximately 100.8 per cent of capacity... and releasing water at the comparatively modest rate of 2.6 gigalitres per day.
"These releases have been occurring to meet downstream requirements, extractive and environmental, and as part of flood mitigation zone operations since September to gradually reduce the storage from the flood mitigation zone."
The flood mitigation zone aims to prevent downstream flooding.
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