BGS Hosted Metadata
Global dilution factors for domestic wastewater in rivers
[THIS DATASET HAS BEEN WITHDRAWN]. The dataset captures the temporal and spatial variability of dilution factors (DFs) around the world using geographically referenced data sets at 0.5 degree resolution and includes long term annual and monthly DFs grids. The dilution factor (DF) dataset is composed of 13 rasters: 1 annual and 12 monthly. DFs are a critical component in estimating concentrations of 'down-the-drain' chemicals which enter freshwaters following consumer use via the domestic waste water stream (e.g., pharmaceuticals, household cleaning products). The DF is defined as the ratio between flow and total domestic wastewater effluent generated within a catchment. The methodology was specifically developed to be applied across the world even within those countries where river flow data and/or wastewater effluent data is scarce. The present dataset has potential for a wide international community (including decision makers and pharmaceutical companies) to assess relative exposure to 'down-the-drain' chemicals released by human pollution in rivers and, thus, target areas of potentially high risk. Full details about this dataset can be found at https://doi.org/10.5285/42044391-a041-4884-bed7-67f67490224f
Simple
- Date (Publication)
- 2014-07-11
- Date (Creation)
- 2013-12-31
- Citation identifier
- https://catalogue.ceh.ac.uk/id/42044391-a041-4884-bed7-67f67490224f
- Citation identifier
- doi: / 10.5285/42044391-a041-4884-bed7-67f67490224f
- Other citation details
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Keller, V.D.J., Williams, R., Lofthouse, C., Johnson, A.C. (2014). Global dilution factors for domestic wastewater in rivers. NERC Environmental Information Data Centre 10.5285/42044391-a041-4884-bed7-67f67490224f
- Point of contact
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Organisation name Individual name Electronic mail address Role UK Centre for Ecology & Hydrology Keller, V.
Point of contact Centre for Ecology & Hydrology Keller, V.D.J. Author Centre for Ecology & Hydrology Williams, R.
Author Centre for Ecology & Hydrology Lofthouse, C.
Author Centre for Ecology & Hydrology Johnson, A.C. Author NERC EDS Environmental Information Data Centre Custodian NERC Environmental Information Data Centre Publisher
- Maintenance and update frequency
- Not planned
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GEMET - INSPIRE themes, version 1.0
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Hydrography
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GEMET - Concepts, version 4.1.3
- Keywords
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- Modelling
- Pollution
- Water quality
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Dilution factor
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down-the-drain chemicals
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environmental risk assessment
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PEC
- Access constraints
- Other restrictions
- Other constraints
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Withdrawn
- Use constraints
- Other restrictions
- Other constraints
- License terms and conditions apply
- Use constraints
- Other restrictions
- Other constraints
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Dilution factor values along the coastlines must be handled with care due to higher uncertainty in accounting for population discharging to sea rather than rivers.
- Use constraints
- Other restrictions
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User should be aware that higher uncertainties arise when estimating river flows and, hence, dilution factors in catchments smaller than 25 000 km2.
- Use constraints
- Other restrictions
- Other constraints
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If you reuse this data, you should cite: Keller, V.D.J., Williams, R., Lofthouse, C., Johnson, A.C. (2014). Global dilution factors for domestic wastewater in rivers. NERC Environmental Information Data Centre https://doi.org/10.5285/42044391-a041-4884-bed7-67f67490224f
- Spatial representation type
- Grid
- Distance
- 0.5 urn:ogc:def:uom:EPSG::9001
- Language
- English
- Character set
- UTF8
- Topic category
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- Inland waters
- Begin date
- 2013-12-31
))
- Unique resource identifier
- WGS 84
- Distribution format
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Name Version Esri ASCII grid
- Distributor contact
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Organisation name Individual name Electronic mail address Role NERC EDS Environmental Information Data Centre
Distributor
- OnLine resource
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Protocol Linkage Name https://data-package.ceh.ac.uk/sd/42044391-a041-4884-bed7-67f67490224f.zip Supporting Information
- Hierarchy level
- Dataset
- Other
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dataset
Conformance result
- Title
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Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Date (Publication)
- 2010-12-08
- Statement
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The river flow was derived from the 0.5 degree resolution annual and monthly composite runoff fields produced by Fekete et al. ( http://www.compositerunoff.sr.unh.edu/). These long term average runoff values were estimated across the globe by combining a simple water balance model and observed river discharge data. The monthly and annual runoff are accumulated using a topographically-derived flow direction grid to produce river flows at a 0.5 degree resolution. The domestic wastewater effluent was obtained by combining population estimates and per capita domestic water use estimates (national estimates). Population estimates were based on the GPW (Gridded population of the world) v.3 data set for 2005 at 0.5 degree resolution ( http://sedac.ciesin.columbia.edu/data/set/gpw-v3-population-count-future-estimates). Four main data sources (public domain) for national per capita domestic water use were used: i) Gleick (2009) ii) Food and Agriculture Organisation ( http://www.fao.org/nr/water/aquastat/main/index.stm) iii) World Resource Institute iv) Organisation for Economic Co-operation and Development ( http://www.oecd.org/env/indicators-modelling-outlooks/oecdenvironmentaldatacompendium.htm) Where discrepancies arose in domestic water use data, only the data for the year 2000 or later was retained, and from these the lowest estimate was selected to provide a more conservative value for the DF. These selected national estimates were then used to derive a 0.5 degree resolution grid of domestic water use.
Metadata
- File identifier
- 42044391-a041-4884-bed7-67f67490224f XML
- Metadata language
- English
- Character set
- 8859 Part 1
- Hierarchy level
- Dataset
- Hierarchy level name
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dataset
- Date stamp
- 2025-11-21T11:12:49
- Metadata standard name
- UK GEMINI
- Metadata standard version
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2.3
- Metadata author
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Organisation name Individual name Electronic mail address Role NERC EDS Environmental Information Data Centre Point of contact
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