42044391-a041-4884-bed7-67f67490224f English ISO/IEC 8859-1 (also known as Latin 1) dataset dataset NERC EDS Environmental Information Data Centre Lancaster Environment Centre, Library Avenue, Bailrigg Lancaster LA1 4AP UK info@eidc.ac.uk https://eidc.ac.uk/ EIDC website The Environmental Information Data Centre (EIDC) is the UK's national data centre for terrestrial and freshwater sciences. information pointOfContact 2025-11-21T11:12:49 UK GEMINI 2.3 WGS 84 Global dilution factors for domestic wastewater in rivers 2014-07-11 publication 2013-12-31 creation https://catalogue.ceh.ac.uk/id/42044391-a041-4884-bed7-67f67490224f 10.5285/42044391-a041-4884-bed7-67f67490224f doi: 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 NERC Environmental Information Data Centre 10.5285/42044391-a041-4884-bed7-67f67490224f [THIS DATASET HAS BEEN WITHDRAWN].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 Keller, V. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk pointOfContact Keller, V.D.J. Centre for Ecology & Hydrology enquiries@ceh.ac.uk https://orcid.org/0000-0003-4489-5363 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information author Williams, R. Centre for Ecology & Hydrology enquiries@ceh.ac.uk author Lofthouse, C. Centre for Ecology & Hydrology enquiries@ceh.ac.uk author Johnson, A.C. Centre for Ecology & Hydrology enquiries@ceh.ac.uk https://orcid.org/0000-0003-1570-3764 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information author NERC EDS Environmental Information Data Centre info@eidc.ac.uk custodian NERC Environmental Information Data Centre info@eidc.ac.uk publisher notPlanned Hydrography theme GEMET - INSPIRE themes, version 1.0 2008-06-01 publication exposure modelling river catchment GEMET - Concepts, version 4.1.3 2019-01-28 creation Modelling Pollution Water quality Dilution factor down-the-drain chemicals environmental risk assessment PEC otherRestrictions Withdrawn otherRestrictions License terms and conditions apply otherRestrictions 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. otherRestrictions User should be aware that higher uncertainties arise when estimating river flows and, hence, dilution factors in catchments smaller than 25 000 km2. otherRestrictions 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 grid 0.5 English utf8 inlandWaters 2013-12-31 -180 180 -90 90 Esri ASCII grid NERC EDS Environmental Information Data Centre info@eidc.ac.uk distributor https://data-package.ceh.ac.uk/sd/42044391-a041-4884-bed7-67f67490224f.zip Supporting Information Supporting information available to assist in re-use of this dataset. information dataset dataset 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 2010-12-08 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.