Bathing Water Catchments (England)

These are the Bathing Waters Zones of Influence (ZOI) Catchments from the Environment Agency's Spatial Data Catalogue. We have downloaded them, symbolised them and published as a feature layer. Bathing water zones of influence (ZOI) are defined as an area where if heavy rainfall occurs may lead to surface water runoff causing a reduction in water quality at a designated bathing water. These Bathing waters are often impacted by either surface water or streams & rivers. Not all bathing waters have zones of influence, very small catchments or run off areas have not been defined. They were originally designed to be presented on PDF maps for use in bathing water profiles as per the bathing water directive 2006/7/EC in 2012 and therefore of low resolution. The polygons were derived from a range of sources from digital elevation models to being manually digitised. They are annual updated with any changes to the designated bathing water inventory. Find out more at environment.data.gov.uk. This layer has been replaced with a layer containing the latest data here: Bathing Water Catchments (England)