Source apportionment of nutrient contributions to rivers in England and Wales modelled with SAGIS
bibliographic citation: Daldorph, P. (2017). Source apportionment of nutrient contributions to rivers in England and Wales modelled with SAGIS. NERC Environmental Information Data Centre. https://doi.org/10.5285/8c5d9e38-0244-4a39-8600-a85513a6fecf
description: Estimates of in-river concentrations (mg/l) and loads (kg/day) of nutrients to rivers in England and Wales from multiple sector sources, modelled with SAGIS (Source Apportionment GIS). The nutrients include nitrate (mg/l N) and ortho-phosphate (mg/l P); the estimate loads are expressed as kilograms per day (kg/day) and the in-river concentrations as milligrams per litre (mg/l). Sources are both diffuse and point. Diffuse sources include livestock farming, arable farming, highways, urban runoff, background (from soils), onsite wastewater treatment systems and atmospheric deposition. Point sources include treated wastewater effluent, combined sewer overflows and storm tanks, industrial discharges and mine water discharges. Concentrations and loads are modelled using the Environment Agency's catchment river model, SIMCAT, at the locations of model features or every 1 km along each river, taking into account all upstream sources and user defined river losses. SAGIS is a modelling framework was developed through the UK Water Industry Research Programme (UKWIR) project 'Chemical Source Apportionment under the WFD' [1], with support from the Environment Agency and SEPA. The model is also described in [2] [1] UKWIR (2012) Chemical Source Apportionment under the WFD (12/WW/02/3). Final report for UK Water Industry Research, 1 Queen Annes Gate, London, ISBN: 1 84057 637 5. [2] Comber, S.D.; Smith, R.; Daldorph, P.; Gardner, M.J.; Constantino, C.; Ellor, B. (2013) Development of a Chemical Source Apportionment Decision Support Framework for Catchment Management. Environ. Sci. Technol. 47, 9824-9832
provenance: ProvenanceStatement
  label: This dataset has been modelled with The Source Apportionment-GIS (SAGIS) using data from the period spanning from 2006 to 2009. Input datasets include: river network outline, water body boundary, hydrology and river monitoring data, rainfall, land use and agricultural data, on-site wastewater treatment system, sewage treatment works, combined sewer overflows and storm tank locations, soil erosion, highway runoff and pollution inventory industrial discharges to river and sewer including extensive sewage treatment works data. Loads are converted to concentrations in river waters using the SIMulation of CATchments (SIMCAT) water quality model, which is incorporated within SAGIS, so that the contribution to in-stream concentrations from individual sources can be quantified. Diffuse sources of nutrient pollution are incorporated into SAGIS from the Phosphorus and Sediment Yield Characterisation In Catchments (PSYCHIC) model (developed by a consortium of academic and government organisations led by ADAS Water Quality). SAGIS models are not time based and do not show seasonal variation; river flow can vary according to seasonal changes which would have an impact on results. The model will also always be a simplified version of reality and so must be used as an advisory tool and not as the sole basis of decisions. Data is often subject to change and so the models require regular updates. Livestock and arable inputs have been calculated from the ADAS models PSYCHIC and NEAPN and have been shown to overestimate inputs in some areas. There is also a related issue, of changing crop types and land use.
spatial: Location
temporal: PeriodOfTime
  start date: 2006-01-01
  end date: 2009-12-31
publisher: NERC Environmental Information Data Centre
is referenced by: es401793e
subject: Pollution
subject: nutrient
subject: river
subject: SAGIS
subject: SIMCAT
subject: arable farming
subject: livestock farming
subject: highway
subject: waste water
subject: pollutant deposition
subject: industrial effluent
subject: runoff
subject: agricultural effluent
type: Dataset
available: 2017-02-23
landing page: https://doi.org/10.5285/8c5d9e38-0244-4a39-8600-a85513a6fecf
license: plain
rights: RightsStatement
  copyright notice: The following copyright notice should be placed on all copies of information or images derived from this dataset: 'Based upon [insert dataset name] copyright Copyright and Database right UKWIR.'
access rights: RACC
theme: Pollution
distribution:
  access URL: https://data-package.ceh.ac.uk/data/8c5d9e38-0244-4a39-8600-a85513a6fecf
  license: plain
  rights: RightsStatement
    copyright notice: The following copyright notice should be placed on all copies of information or images derived from this dataset: 'Based upon [insert dataset name] copyright Copyright and Database right UKWIR.'
  access rights: RACC
  format: Shapefile
language: en

Daldorph, P.
type: Person
family name: Daldorph
given name: Peter
member: Atkins Ltd

NERC Environmental Information Data Centre
type: Organization

Daldorph, P.
type: Person
family name: Daldorph
given name: P.
member: Atkins Ltd

es401793e
type: Expression
bibliographic citation: Comber, S.D.; Smith, R.; Daldorph, P.; Gardner, M.J.; Constantino, C.; Ellor, B. (2013) Development of a Chemical Source Apportionment Decision Support Framework for Catchment Management. Environ. Sci. Technol. 47, 9824−9832.

Pollution
type: Concept

nutrient
type: Concept

river
type: Concept

arable farming
type: Concept

livestock farming
type: Concept

highway
type: Concept

waste water
type: Concept

pollutant deposition
type: Concept

industrial effluent
type: Concept

runoff
type: Concept

agricultural effluent
type: Concept

Atkins Ltd
type: Organization