Tuesday, 19 January 2016

December 2015 overview

Groundwater levels, Dec 2015
Groundwater levels, December 2015
The UK saw widespread and severe fluvial flooding in December, as exceptional rainfall led to some very high river flows.

Levels in the index boreholes were generally in the normal range or above for December. Levels recovered in response to winter recharge, except at some sites in parts of the eastern Chalk with thick unsaturated zones or where recharge was limited by superficial deposits (Aylesby, Therfield Rectory, Stonor Park, Well House Inn and Westdean No. 3)
and at Nuttalls Farm (in the Permo-Triassic sandstone).

Groundwater level hydrograph for Newbridge
Groundwater level at Newbridge, near Dumfries
The exceptional rainfall in the northern half of the UK resulted in high groundwater levels with record monthly values recorded at Killyglen (Chalk) and Newbridge (Permo‑Triassic sandstone). The groundwater level for Newbridge, near Dumfries, was the highest December value since records began in 1993.

Other levels in the north were notably high, except for Dalton Holme, which normally
responds slowly to recharge from rainfall. Groundwater from the Corallian aquifers at Old Malton in North Yorkshire contributed to high river levels, and high groundwater levels in permeable superficial deposits contributed to flooding in river valleys across northern Britain.

For more information, see the Hydrological Summary for December 2015.

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