Editing Hydrogeology of Nigeria

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====Igneous====
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====Igneous - Volcanic====
 
{| class = "wikitable"
 
{| class = "wikitable"
 
|Named Aquifers||Aquifer Productivity||General Description||Water quantity issues||Water quality issues
 
|Named Aquifers||Aquifer Productivity||General Description||Water quantity issues||Water quality issues
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|Volcanic rocks, including basalts
 
|Volcanic rocks, including basalts
 
||Low to Moderate Productivity
 
||Low to Moderate Productivity
||Igneous aquifers include volcanic and granitic rocks. The volcanic aquifers generally provide low to moderate yields, usually below 3 l/s.  These aquifers are typically unconfined, with typical variations in water table depth of less than 5 m.  Aquifer thickness varies substantially, and borehole depths of 15 to 50 m are common. Direct rainfall recharge.
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||Igneous volcanic aquifers provide low to moderate yields, usually below 3 l/s.  These aquifers are typically unconfined, with typical variations in water table depth of less than 5 m.  Aquifer thickness varies substantially, and borehole depths of 15 to 50 m are common. Direct rainfall recharge.
 
||None
 
||None
 
||Water quality is generally good.
 
||Water quality is generally good.

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