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Groundwater levels

SouthEast Region


SouthEast region water levels hydrograph

*The long term average (LTA) has been calculated statistically, using the long term data record for this hydrograph. The respective drought zones are used as operational triggers, and have been derived using the LTA.

*Drought zone 1 is the LTA in Southeast region.


Rainfall in our Southeast region was significantly below average in April, at 11% of the LTA. This marked the third month in a row with below average rainfall, and as a result groundwater levels have continued to decline. Despite this, groundwater levels remain above average for the time of year, which is due to the high rainfall received overall in the earlier part of the recharge period (October to January inclusive). Predictions indicate that under all rainfall scenarios levels will continue to decline from this point, however they are likely to remain above the LTA curve if we receive more than 80% of LTA rainfall month on month. Continued low rainfall (60% of LTA or less) could result in levels reaching the LTA/drought trigger 1 in summer this year.

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