Wet December helps boost reservoirs impacted by exceptionally dry summer

A wetter than average end to the year has given a welcome boost to Yorkshire’s reservoirs, which had been impacted by one of the driest summers on record in 2018.

The weather has been wetter since the end of November, with December seeing 135% of the long term average rainfall. This wet weather, combined with the use of Yorkshire’s unique grid system to maximise river and groundwater sources has led to significantly increased reservoir stocks in the region.

During the last week of November and first two weeks of December reservoir stocks increased by 26%; the largest ever improvement in reservoir stocks over a three-week period in Yorkshire. As a result, reservoir levels are now closer to normal levels and at the start of January 2019 were at around 84%.

The latest figures have been published as part of Yorkshire Water’s commitment to publishing water resources data through it’s open data programme, which was announced last month.

Thanks to the improved situation, the company no longer needs to pursue drought permits to reduce compensation flows from the region’s reservoirs, but is continuing with drought permits for two rivers, the Wharfe and the Derwent.

The Environment Agency recently approved Yorkshire Water’s application for a drought permit to increase the annual abstraction limit for the River Wharfe and an application for a drought permit for changes to the abstraction licences for the River Derwent is currently being considered.

Yorkshire Water Chief Executive Richard Flint said, “Overall the position has improved significantly in recent weeks, but we are not complacent and will continue to carefully manage the situation throughout the winter to ensure we are in the best possible position going into next spring and summer.”

“As part of that precautionary approach we are continuing with plans for drought permits on the Wharfe and Derwent. During the summer we maximised the amount of water we took from river sources in order to protect reservoir levels. The drought permits are important as they will ensure we continue to have the flexibility to draw on river sources to protect reservoir stocks in the early spring.”

This summer’s dry weather has also prompted Yorkshire Water to look at new options for managing demand in dry weather for the future.

Richard Flint said, “Traditionally the response to drought conditions has been to consider restrictions on customers’ water use, such as hosepipe bans. But a lot has changed since the idea of hosepipe bans was developed, both in terms of technology and people’s attitudes. This summer’s dry weather has brought those changes to the fore and we’ll soon be sharing work we’ve been doing with the Environment Agency and others to look at how we can help our customers to make decisions about their own water use in a way that contributes to reduced demand across the whole region”.


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