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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 well below average in April, at 42% of the LTA. Rainfall over the recharge period (October to March inclusive) has been 77 % of the LTA and effective precipitation over this period has been 63 % of the LTA. These drier than average conditions have meant that the Chalk groundwater levels have continued the declining trend started in February. As a result, Chalk groundwater levels remain below the LTA/drought trigger 1 curve. Groundwater levels are likely to continue declining through the summer, including under an above average rainfall scenario (120 % of the LTA). If conditions are drier than average, groundwater levels will decline faster than the LTA recession, and there is potential for them to enter drought trigger 2 by mid-summer. Please refer to our Drought Plan for what this means for us and our customers (Plans - Drought management plan - Affinity Water).

The continued below average rainfall through April has limited recovery of river flows, and those in our Southeast region are currently categorised as ‘below normal’ by the Environment Agency.

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