Review of NVZ Designation Methodology

WRc reviewed and updated the methodology used to designate Nitrate Vulnerable Zones (NVZs) under the Nitrates Directive and supported the client in developing new boundaries for surface water and groundwater NVZs in England and Wales. A weight of evidence approach was designed and implemented, with component lines of evidence developed based upon quantile regression of nitrate concentrations in rivers and predictive modelling of water quality based on land use. The results were used to inform the designation of NVZs in England and Wales in 2013.

Simon Clarke head of catchment management Tel: +44(0) 1793 865000