Floods

Flood water in York in December 2015. The Telegraph 07/01/16

Floods are becoming more common. In recent years, storms in winter and summer, have caused devastating floods across large areas of the UK, including Yorkshire. Millions of pounds of damage have been caused to infrastructure and homes. Flood events can also be detrimental to river ecology and can increase the delivery of pollutants to the channel.

There are several reasons for the increased frequency and magnitude of flooding and the exact causes of flooding events are difficult to determine. There is an increasing body of evidence to suggest that extreme daily rainfall rates are becoming more intense as a result of climatic warming.

Drought

Droughts are usually a result of long periods of below average rainfall but can be made worse by abstraction and land use change. Areas of Yorkshire were declared as under drought conditions in spring 2012. Drought can cause significant problems for wildlife as well as limiting human uses of water. The low flows also reduce the capacity of the river to dilute pollutants.

Grimwith Reservoir near Hebden in drought conditions. © Copyright Stephen Craven

Changes to catchment land use, such as urbanisation and moorland drainage, can result in water been delivered rapidly to the channel. As well as increasing flood risk, this means that there is less water stored in the catchment, in groundwater and aquifers, to buffer against drought conditions.

Abstraction is the removal of water from rivers, lakes, wetlands or reservoirs. Water is abstracted to meet a wide range of uses including drinking water, industry and agriculture. The effect abstraction has on the environment depends on the amount and timing of the abstraction. The Environment Agency have a licensing system to control abstraction and aim to ensure sustainable supplies of water for the public, businesses and agriculture while making sure rivers and other wetlands support a good ecology.

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