Flooding in the Gwydir Valley
The Gwydir Valley is a distributary river system, which spreads our rivers and creeks across the Gwydir Floodplain which acts as a large
inland delta. Our rivers spill out naturally to these floodplains when they are full and spilling. Not every flood is the same, they
range in magnitude of height and duration and can occur from locally generated rain or from rainfall further upstream of the
catchment.
Recent flood warnings in December 2020 were predicted because of upstream rainfall and inflows. This was a short, sharp and small flow
which has created limited flooding. For example, the height at Pallamallawa was half of that experienced in 2011 and 2012 when the
entire north-west was in flood. This flow also didn't contain a lot of water but its peak flow rate at Pallamallawa of 33,000 ML/day was
still higher than the operating capacity of the regulator and cannot be managed. Rather this water flows naturally, unmanaged by
WaterNSW to the watercourse the lowest point of our inland delta and towards the Gwydir Wetlands.