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Stocks in many reservoirs fall appreciably

New monthly Hydrological summary published for March 2011 - stocks in many reservoirs fall appreciably
14 April 2011

A sunny day at Ennerdale reservoir

Within the UK, March 2011 was provisionally the driest since 1961 for England & Wales, with very meagre rainfall totals in many central, southern and eastern areas – contributing to substantial accumulated rainfall deficiencies over periods of up to 16 months.

Reservoir stocks increased through March in a number of major impoundments in the English Lowlands but elsewhere, and contrary to the normal pattern, stocks in many reservoirs fell appreciably. Early April stocks were the lowest since 1996 for England & Wales as a whole, with the most notable anomalies in south west England. Nonetheless, stocks were within 10% of the early April average, and appreciably above drought minima, in all index reservoirs/reservoir groups across the UK.

The above analysis is contained within the latest monthly hydrological summary (for March 2011) produced by the National Hydrological Monitoring Programme, operated by the Centre for Ecology & Hydrology in conjunction with the British Geological Survey.

UK rainfall patterns in March can be pivotal in relation to the water resources outlook: with evaporation accelerating through the spring, an exceptionally dry month may signal the end of the aquifer recharge season and an early onset in the seasonal decline of reservoir stocks

Terry Marsh, from the Centre for Ecology & Hydrology, said, “Water resources held up well in March. That said, the recent exceptionally dry 6-7 week spell - following a moderate rainfall deficiency since the autumn of 2009 - has come at a pivotal time for water resources. A dry April could lead to a significant deterioration in the resources outlook, so we need to keep a careful eye on things over the next few weeks.”

In general terms, water resources are resilient to the current scale of long term rainfall deficiencies but a dry late spring would increase the stress on resources and herald exceptionally depressed river flows during the summer. Careful monitoring will be needed to index any significant intensification of the nascent drought conditions over the coming weeks.

The Centre for Ecology & Hydrology jointly operates the National Hydrological Monitoring Programme (NHMP) in conjunction with the British Geological Survey. NHMP scientists produce the UK Monthly Hydrological Summary which assesses rainfall, river flows, groundwater and reservoir levels. They also operate the National River Flow archive. The NHMP has a remit to analyse major flood and drought events in the UK and analyse long term trends in UK hydrological data. The Programme was set up in 1988 and relies on the active co-operation of measuring authorities throughout the UK.

Notable statistics:

Significant frontal rainfall was recorded in parts of Scotland (e.g. 38mm at Kinlochewe on the 8th and 35mm at Cluanie Inn on the 10th) and snowfall contributed to above average March precipitation totals in much of eastern and central Scotland.

For the South West region rainfall over the 16 months ending in March was the lowest since 1975/76.

In Wales and the South West, the Yscir, Dee and Taw each registered their 2nd lowest (after 1993) March runoff on record.

Across most major aquifer outcrop areas, March rainfall totals were less than 20% of average.

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