Serving parts of North West London and the Home Counties.

Groundwater Levels

East Region


East region groundwater levels

*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.


Groundwater levels in the East region are currently below the drought zone 1 curve, lower than at this point during 2018. Levels entered drought zone 1 during the recession period of 2018, receding more quickly than the LTA. They increased between October and December 2018 at a similar rate to the LTA but declined through January 2019 as a result of rainfall which was 38 % of the LTA and effective precipitation which was 18 % of the LTA. Soil moisture deficit finished January slightly above than the LTA and the monthly average was higher than the LTA, meaning that the rain which we receive over the coming months will need to first erode this before contributing significantly to groundwater recharge.

There are a range of possible scenarios for 2019. An average (100 % of the LTA) rainfall scenario could see levels dip down towards drought zone 2 whilst lower rainfall (60 % or 80 % of the LTA) may see levels crossing drought zone 2 in summer/autumn 2019.