Editing Hydrogeology of Burkina Faso

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====Crystalline basement====
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====Crystalline Basement====
 
{| class = "wikitable"
 
{| class = "wikitable"
|Named aquifers||General description||Water quantity issues||Water quality issues||Recharge
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|Named Aquifers||General Description||Water quantity issues||Water quality issues||Recharge
 
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|Granites, gneisses, schists, quartzites and greenstones.
 
|Granites, gneisses, schists, quartzites and greenstones.
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Fractured bedrock, sometimes underlying and associated with, weathered zones, also forms an aquifer in the basement rocks. Fractured aquifer zones can range from 10 m to 80 m thick, and the water table can range from 20 m to 60 m below the ground surface. Boreholes abstracting from this aquifer are between 40 and 150 m deep.
 
Fractured bedrock, sometimes underlying and associated with, weathered zones, also forms an aquifer in the basement rocks. Fractured aquifer zones can range from 10 m to 80 m thick, and the water table can range from 20 m to 60 m below the ground surface. Boreholes abstracting from this aquifer are between 40 and 150 m deep.
  
Average borehole yields are around 2 m³/hour (Obuobie and Barry, 2012; yield data from the Burkina national borehole database).
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Average borehole yields are around 2 m³/hour (Obuobie and Barry 2012; yield data from the Burkina national borehole database).
  
 
||Groundwater from crystalline basement aquifers is dominantly used for rural water supplies (70%), with other uses being for mineral water and other commercial/industrial use (25%) and a small amount of abstraction for agriculture (2%).
 
||Groundwater from crystalline basement aquifers is dominantly used for rural water supplies (70%), with other uses being for mineral water and other commercial/industrial use (25%) and a small amount of abstraction for agriculture (2%).
||Groundwater is thought to be generally of Ca-Mg-HCO<sub>3</sub> type (BGS 2002). Arsenic has been identified as a problem in some areas, particularly associated with zones of gold mineralisation in Birimian (Lower Proterozoic) volcano-sedimentary rocks (Smedley et al., 2007).
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||Groundwater is thought to be generally of Ca-Mg-HCO3 type (BGS 2002). Arsenic has been identified as a problem in some areas, particularly associated with zones of gold mineralisation in Birimian (Lower Proterozoic) volcano-sedimentary rocks (Smedley et al. 2007).
||Recharge occurs from rainfall infiltration and is typically low. Indirect recharge in local depressions can be important (Obuobie and Barry, 2012).  
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||Recharge occurs from rainfall infiltration and is typically low. Indirect recharge in local depressions can be important (Obuobie and Barry 2012).  
 
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