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Groundwater levels

Central Region

 

Central 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.

 

Rainfall in our Central region was below average in September, at 74% of the LTA, although the start of October has been very wet. Groundwater levels have continued to decline, at the same rate as the LTA trend, however they are still above average for the time of year. Soil moisture deficit is close to average for the time of year. Groundwater levels are forecast to continue tracking above the LTA curve if we receive average rainfall in the upcoming months. Under a very low rainfall scenario (60% of LTA month on month), groundwater levels could cross drought trigger 1 towards the end of the calendar year.

The Chalk derived baseflow of streams across our Central region remains at or above average as a result of the high groundwater levels. Flows in most of the catchments across our Central region are currently classified as ‘normal’ or ‘above normal’ by the Environment Agency.

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