Editing Hydrogeology of Ghana

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====Consolidated Sedimentary Aquifers with Fracture Flow====
 
====Consolidated Sedimentary Aquifers with Fracture Flow====
 
{| class = "wikitable"
 
{| class = "wikitable"
|Named Aquifers||General Description||Water quality issues||
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|Named Aquifers||General Description||Water quality issues||Recharge
 
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|Upper Voltaian: Obosum Group
 
|Upper Voltaian: Obosum Group
 
||Very low to zero intergranular permeability. Sandstone units can show variable development of joints, open planes and faults, creating secondary permeability. In thick sandstone units where secondary fracture permeability is well developed, high yielding boreholes have been developed, but in other areas, sandstones have proved to have low productivity. Mudstone and siltstone areas generally form a very low productivity aquifer, with little groundwater.  
 
||Very low to zero intergranular permeability. Sandstone units can show variable development of joints, open planes and faults, creating secondary permeability. In thick sandstone units where secondary fracture permeability is well developed, high yielding boreholes have been developed, but in other areas, sandstones have proved to have low productivity. Mudstone and siltstone areas generally form a very low productivity aquifer, with little groundwater.  
 
||Groundwater from sandstones is often less mineralised than groundwater from mudstone and siltstones. However, there is some evidence that fluoride is more common in sandstones than in mudstones or siltstones. Groundwater from units dominated by mudstones and siltstones often has relatively high conductivity.
 
||Groundwater from sandstones is often less mineralised than groundwater from mudstone and siltstones. However, there is some evidence that fluoride is more common in sandstones than in mudstones or siltstones. Groundwater from units dominated by mudstones and siltstones often has relatively high conductivity.
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|Middle Voltaian: Oti/Pendjari Group
 
|Middle Voltaian: Oti/Pendjari Group
 
||Very low to zero intergranular permeability. Sandstone units show variably well-developed joints, open planes and faults, creating secondary permeability. Extensively fractured sandstone units can form moderately to highly productive aquifers, but there is wide variability in recorded yields, indicating that fractures are not well developed everywhere. Borehole yields range from less than 5 to 1000 l/min, but are often between 10 and 300 l/min. Units dominated by siltstones and mudstones tend to show lower yields, often between 20 and 40 l/min.  
 
||Very low to zero intergranular permeability. Sandstone units show variably well-developed joints, open planes and faults, creating secondary permeability. Extensively fractured sandstone units can form moderately to highly productive aquifers, but there is wide variability in recorded yields, indicating that fractures are not well developed everywhere. Borehole yields range from less than 5 to 1000 l/min, but are often between 10 and 300 l/min. Units dominated by siltstones and mudstones tend to show lower yields, often between 20 and 40 l/min.  
 
||Groundwater from sandstones is often less mineralised than groundwater from mudstone and siltstones. However, there is some evidence that fluoride is more common in sandstones than in mudstones or siltstones.
 
||Groundwater from sandstones is often less mineralised than groundwater from mudstone and siltstones. However, there is some evidence that fluoride is more common in sandstones than in mudstones or siltstones.
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|Lower Voltaian: Kwahu/Boumbaka groups
 
|Lower Voltaian: Kwahu/Boumbaka groups
 
||Very low to zero intergranular permeability. Sandstone units such as the Anyaboni Sandstone and Panaboko Sandstone formations often form moderately to highly productive aquifers, dominated by secondary fracture permeability, often in thin zones, with borehole yields often between 150 and 250 l/min. There is evidence for groundwater inflows to boreholes to at least 100m depth.  
 
||Very low to zero intergranular permeability. Sandstone units such as the Anyaboni Sandstone and Panaboko Sandstone formations often form moderately to highly productive aquifers, dominated by secondary fracture permeability, often in thin zones, with borehole yields often between 150 and 250 l/min. There is evidence for groundwater inflows to boreholes to at least 100m depth.  
 
||Minor occurrences of saline groundwater have been noted in isolated boreholes, typically related to high sulphate concentrations. High iron is common, and high manganese in some areas. High fluoride concentrations occur rarely.  
 
||Minor occurrences of saline groundwater have been noted in isolated boreholes, typically related to high sulphate concentrations. High iron is common, and high manganese in some areas. High fluoride concentrations occur rarely.  
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====Basement====
 
====Basement====

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