Editing Groundwater use

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====An estimate of groundwater dependency in rural Africa using population data====
 
====An estimate of groundwater dependency in rural Africa using population data====
  
[[File: GWUse_Popn.png | 400x250px | right | thumb | Urban and rural population living on: basement rocks (B); consolidated sedimentary rocks in which fracture flow (CSF), intergranular flow (CSI), and fracture and intergranular flow (CSIF) dominate; igneous rocks (I); and unconsolidated sedimentary rocks (U)]]
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[[File: GWUse_Popn.png | 500x312px | right | thumb | Urban and rural population living on: basement rocks (B); consolidated sedimentary rocks in which fracture flow (CSF), intergranular flow (CSI), and fracture and intergranular flow (CSIF) dominate; igneous rocks (I); and unconsolidated sedimentary rocks (U)]]
  
 
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.

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