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Because most of the rural population of Africa depends on groundwater, the density of rural population can be a useful surrogate for groundwater use. [http://nora.nerc.ac.uk/501047/ MacDonald and Davis (2000)] assessed the relative importance, in terms of groundwater use, of the four main hydrogeological provinces (aquifer types) in sub-Saharan Africa, based on estimates of the rural population living in each one. They estimated that up to 220 million people live in rural areas on Precambrian basement, 45 million on volcanic rocks, 110 million on consolidated sedimentary rocks, and 60 million on unconsolidated sediments in sub-Saharan Africa. most of these people are likely to be dependent on groundwater for much of their water supply.
 
Because most of the rural population of Africa depends on groundwater, the density of rural population can be a useful surrogate for groundwater use. [http://nora.nerc.ac.uk/501047/ MacDonald and Davis (2000)] assessed the relative importance, in terms of groundwater use, of the four main hydrogeological provinces (aquifer types) in sub-Saharan Africa, based on estimates of the rural population living in each one. They estimated that up to 220 million people live in rural areas on Precambrian basement, 45 million on volcanic rocks, 110 million on consolidated sedimentary rocks, and 60 million on unconsolidated sediments in sub-Saharan Africa. most of these people are likely to be dependent on groundwater for much of their water supply.
  
This assessment has been extended over the whole of Africa and re-calculated based on the updated [[Hydrogeology Map| hydrogeology map of Africa]] developed by BGS. Gridded datasets of population (total and rural/urban) and the extent of urban areas across Africa were processed to provide an estimate of the number of people living on each main aquifer type, and what proportion of this population lives in rural and urban areas (UNEP/GRID; Balk et al. 2006; CIESEN, IFPRI, The World Bank, and CIAT 2011).  
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This assessment has been extended over the whole of Africa and re-calculated based on the updated [[Hydrogeology Map| hydrogeology map of Africa]] developed by BGS. Gridded datasets of population (from UNEP/GRID African Population Distribution Database 4th Edition) and urban extent (Balk et al., 2006),from the [http://sedac.ciesin.columbia.edu/data/collection/grump-v1 Global Rural-Urban Mapping Project] (GRUMP) Urban Extents Grid V1) across Africa were processed to provide an estimate of the number of people living on each main aquifer type, and what proportion of this population lives in rural and urban areas.
  
 
The study estimated rural populations on each of the main aquifer types of:
 
The study estimated rural populations on each of the main aquifer types of:
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[[File: GroundwaterUse.png | 510x200px | right | thumb | Gridded datasets - population and rural/urban areas - used to approximate groundwater use by aquifer type]]
 
[[File: GroundwaterUse.png | 510x200px | right | thumb | Gridded datasets - population and rural/urban areas - used to approximate groundwater use by aquifer type]]
  
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The [http://sedac.ciesin.columbia.edu/data/collection/grump-v1 Global Rural-Urban Mapping Project] (GRUMP) Urban Extents Grid V1) dataset was produced by the Centre for International Earth Science Information Network (CIESIN) at Columbia University, the International Food Policy Research Institute (IFPRI), the World Bank, and the Centro Internacional de Agricultura Tropical (CIAT). It is based on a combination of population counts, settlement points, and the presence of night-time lights as observed by a series of US Department of Defence meteorological satellites over several decades.
  
 
===Citations and links to further information===
 
===Citations and links to further information===
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Balk, D L, Deichmann, U, Yetman, G, Pozzi, F, Hay, S I, and Nelson, A. 2006. [http://dx.doi.org/10.1016/S0065-308X(05)62004-0 Determining Global Population Distribution: Methods, Applications and Data]. Advances in Parasitology, Vol. 62, 119–156. doi:10.1016/S0065-308X(05)62004-0.
 
Balk, D L, Deichmann, U, Yetman, G, Pozzi, F, Hay, S I, and Nelson, A. 2006. [http://dx.doi.org/10.1016/S0065-308X(05)62004-0 Determining Global Population Distribution: Methods, Applications and Data]. Advances in Parasitology, Vol. 62, 119–156. doi:10.1016/S0065-308X(05)62004-0.
  
*CIESEN, IFPRI, The World Bank, and CIAT. 2011. [http://sedac.ciesin.columbia.edu/data/collection/grump-v1 Global Rural-Urban Mapping Project, Version 1 (GRUMPV1): Urban Extents Grid]. Palisades, NY: NASA Socioeconomic Data and Applications Centre (SEDAC). Accessed 30th October 2014.
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CIESEN, IFPRI, The World Bank, and CIAT. 2011. [http://sedac.ciesin.columbia.edu/data/collection/grump-v1 Global Rural-Urban Mapping Project, Version 1 (GRUMPv1): Urban Extents Grid]. Palisades, NY: NASA Socioeconomic Data and Applications Centre (SEDAC). Accessed 30th October 2014.
  Note: this dataset was produced by the Centre for International Earth Science Information Network (CIESIN) at Columbia University, the International Food Policy Research Institute (IFPRI), the World Bank, and the Centro Internacional de Agricultura Tropical (CIAT). It is based on a combination of population counts, settlement points, and the presence of night-time lights as observed by a series of US Department of Defence meteorological satellites over several decades.
 
  
 
MacDonald, A M, Davies, J. 2000. [http://nora.nerc.ac.uk/501047/ A brief review of groundwater for rural water supply in sub-Saharan Africa]. British Geological Survey Technical Report, WC/00/033.
 
MacDonald, A M, Davies, J. 2000. [http://nora.nerc.ac.uk/501047/ A brief review of groundwater for rural water supply in sub-Saharan Africa]. British Geological Survey Technical Report, WC/00/033.
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Seibert, S, Burke, J, Faures, J M, Frenken, K, Hoogeveen, J, Doll, P, and Portmann, F T. 2010. [http://www.fao.org/docrep/013/al816e/al816e00.pdf Groundwater use for irrigation - a global inventory]. Hydrol. Earth Syst. Sci., 14, 1863-1880. doi: 10.5194/hess-14-1863-2010.
 
Seibert, S, Burke, J, Faures, J M, Frenken, K, Hoogeveen, J, Doll, P, and Portmann, F T. 2010. [http://www.fao.org/docrep/013/al816e/al816e00.pdf Groundwater use for irrigation - a global inventory]. Hydrol. Earth Syst. Sci., 14, 1863-1880. doi: 10.5194/hess-14-1863-2010.
  
UNEP/GRID. 2004. African Population Distribution Database. UNEP GRID Sioux Falls.  
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UNEP/GRID. 2004. African Population Distribution Database. UNEP GRID Sioux Falls. Note: the [http://na.unep.net/siouxfalls/datasets/datalist.php African Population Distribution Database] was retrieved on 29 October 2014, but is currently not available. Information on UNEP's population datasets is available at http://www.un.org/en/development/desa/population/publications/database/index.shtml
  Note: the [http://na.unep.net/siouxfalls/datasets/datalist.php African Population Distribution Database] was retrieved on 29 October 2014, but is currently not available. Information on UNEP's population datasets is available at http://www.un.org/en/development/desa/population/publications/database/index.shtml
 
 
 
  
  

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