{"access":"Access to the LF2000-WQX model, software and data is restricted to licenced users (Defra; Environment Agency) and suppliers (UKCEH; Wallingford Hydrological Solutions). ","capabilities":"LF2000-WQX is a water quality extension to the LowFlows2000 hydrological model originally developed by Wallingford Hydrological Solutions.  Low Flows2000 is an operational model used by the Environment Agency and the water industry for water abstraction and discharge licencing.  LF2000-WQX is a statistical model combining a deterministic core incorporated within a stochastic structure to predict spatially explicit distributions of conservative or degradable down-the-drain chemicals for whole catchments annually and monthly.  It comprises: a module for the estimation of point source emissions; an in-stream river model; and postprocessing of simulation results.  The model can be used to study any conceptual representation of a catchment and can include measured water-quality data.","description":"The LF2000-WQX model simulates and predicts concentrations of down-the-drain chemicals that reach freshwaters in England and Wales via discharges from wastewater treatment plants.  It is used: (1) by UK regulators for abstraction and discharge licencing; and (2) by UKCEH scientists to conduct risk assessments, under current and future river flow conditions, for any chemical used by humans and discharged into rivers from wastewater treatment.","fundingSources":"Development of LF2000-WQX was funded by Environment Agency and Defra.","id":"d6732be1-6104-4b36-bc41-1658d084ef25","infrastructureCategory":{"value":"models","description":"Environmental models","infrastructureClass":"Digital infrastructures","uri":"http://vocabs.ceh.ac.uk/ri/model"},"infrastructureChallenge":[{"value":"Pollution"}],"lifecycle":"The first version of LowFlows2000-WQX was released in 2003, originally using the Windows XP operating system, and was regularly updated until 2013.  Use of LowFlows2000-WQX is still being commisisoned by regulators such as DEFRA.","metadataDate":"2025-04-09T09:24:27","owners":[{"displayName":"Virginie Keller","organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"owner","email":"enquiries@ceh.ac.uk","fullName":"Virginie Keller"}],"partners":"LF2000-WQX was developed jointly by UKCEH and Wallingford Hydrological Solutions (WHS), with support from the Environment Agency.","resourceIdentifiers":[{"code":"https://catalogue.ceh.ac.uk/id/d6732be1-6104-4b36-bc41-1658d084ef25"}],"scienceArea":"Water Resources","title":"LowFlows2000 - Water Quality eXtension (LF2000-WQX)","type":"infrastructureRecord","uniqueness":"LF2000-WQX was developed in collaboration with the Environment Agency to bring together robust hydrological models and water quality models to provide spatially referenced statistical distributions of chemicals in England and Wales for regulatory purposes.  Although similar in capability to the SIMCAT model, LF2000-WQX has unique capabilities: to couple water quantity and quality within the same model; and to estimate wastewater treatment works output from market consumption data.  LF2000-WQX is a powerful model that allows regulators and scientists to undertake risk assessment for any chemical used by humans, and released to the river network via wastewater treatment works, under current and future flow conditions.","uri":"https://catalogue.ceh.ac.uk/id/d6732be1-6104-4b36-bc41-1658d084ef25","users":["LF2000-WQX is used by UKCEH, under contract from Defra and Environment Agency, to undertake risk assessments of down-the-drain (usually point source) chemicals in rivers across England and Wales."]}