Editing Hydrogeology of Chad

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Isotopic studies have highlighted recharge zones to the shallow aquifer in areas of higher elevation and in exposed sand dune areas; as well as infiltration from rivers Lake Chad and wetlands (GWP 2013). In the northern part, in Kanem region, studies have also show high recharge from the slopes of the mountain areas to the north.
 
Isotopic studies have highlighted recharge zones to the shallow aquifer in areas of higher elevation and in exposed sand dune areas; as well as infiltration from rivers Lake Chad and wetlands (GWP 2013). In the northern part, in Kanem region, studies have also show high recharge from the slopes of the mountain areas to the north.
 
   
 
   
In the centre of the basin, groundwater levels are typically deepest - often more than 25 m below ground level - although it is not clear whether these relate to the Chad Formation or to the deeper Continental Terminal aquifer (see below). They tend to shallow towards the west of the basin, to between 10 and 25 m deep; and even more towards the southern edge of the basin, often to less than 5 m deep (UNICEF 2010).
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In the centre of the basin, groundwater levels are typically deepest - often more than 25 m below ground level - although it is not clear whether these relate to the Quaternary or to the deeper Continental Terminal aquifer (see below). They tend to shallow towards the west of the basin, to between 10 and 25 m deep; and even more towards the southern edge of the basin, often to less than 5 m deep (UNICEF 2010).
  
 
Groundwater is abstracted for domestic use and livestock watering through hand dug wells (in the shallow aquifer) and boreholes.  
 
Groundwater is abstracted for domestic use and livestock watering through hand dug wells (in the shallow aquifer) and boreholes.  

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