Tuesday, 18 August 2015

July 2015 overview

Groundwater levels, July 2015
July was wet: the majority of UK regions registered in excess of 150% of the long-term average rainfall. Parts of north-east and south-west England, and particularly much of Scotland and East Anglia, recorded more than 200% of average rainfall, whilst near or below average rainfall was restricted to areas of Kent and Sussex, the Midlands and the far north of Scotland. 

Soil moisture deficits decreased throughout the UK in July, but despite this, levels continued to fall at all index sites except Killyglen, Pant y Lladron and Dial Farm. However, in some places recession rates slowed due to heavy rainfall in the last week of the month. 

With the exception of the fast responding Chalk at Killyglen, levels in the Chalk were near average or below, with notably low levels which persisted since the end of June at Tilshead and Dalton Holme. Levels decreased in July at Chilgrove House and Compton House and were notably low by month-end. 

Groundwater levels at Ampney Crucis in the Jurassic limestones
In the Jurassic limestones, levels fell and remained in the normal range or below, and in the Magnesian Limestone, levels remained in the normal range at Brick House Farm. 

In the Permo-Triassic sandstones, levels were near to above average, except for Llanfair DC where levels were below normal. For the second consecutive month, Newbridge recorded a new monthly maximum level. Levels at Nuttalls Farm were also exceptionally high and registered as the third highest end of July level in record from 1974. Levels in the fast responding Carboniferous Limestone of south Wales were near to above normal.

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

Wednesday, 12 August 2015

Hydrological Outlook from August 2015

Hydrological Outlook from August 2015
The latest Hydrological Outlook is available.

The latest predictions for UK precipitation favour below-average rainfall for August and August-September-October as a whole.

In southern and eastern England, July groundwater levels were normal to below normal, notably so in parts of the Chalk in Hampshire, Wiltshire and Yorkshire. 

Conversely, levels were exceptionally high in parts of the slowly responding Permo-Triassic sandstones of the Midlands and southern Scotland. 

The outlook for August is for the continuation of a similar pattern. Below normal levels are likely in Wessex, Wales and eastern England, whilst above normal levels are likely to persist in parts of the Permo-Triassic aquifers. 

The outlook for the next three months is also similar, with exceptionally low levels possible in parts of the southern Chalk.

For further information see the full Hydrological Outlook for August.