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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 August, at 65% of the LTA. Groundwater levels have continued to decline, at a slightly faster rate than the LTA trend, however they are still above average for the time of year. Soil moisture deficit has remained slightly below average for the time of year. Groundwater levels are forecast to continue declining until the onset of the next recharge period. Even with continued decline, predictions indicate that levels are likely to remain above average through the autumn. Under a very low rainfall scenario (60% of LTA) they could cross drought trigger 1 in late December. Wetter conditions are likely to result in groundwater levels remaining above the drought trigger curves throughout the recharge period.

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

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