Editing Hydrogeology of Mauritania

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|Dune, alluvial and lacustrine sediments
 
|Dune, alluvial and lacustrine sediments
||Some, but not all, of these sediments are shown on the map of Unconsolidated (Superficial) Geology, above. Such unconsolidated sediments crop out across much of the interior of the country. Dune sands are widespread. Alluvial sands, gravels, silts and clays occur in wadi (ephemeral river) valleys. Lacustrine sediments, including evaporite deposits, occur at the sites of former  or ephemeral lakes.  
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||Some, but not all, of these sediments are shown on the map of Unconsolidated (Superficial) Geology, above. They crop out across much of the interior of the country. Dune sands are widespread. Alluvial sands, gravels, silts and clays occur in wadi (ephemeral river) valleys. Lacustrine sediments, including evaporite deposits, occur at the sites of former  or ephemeral lakes.  
 
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|'Continental Terminal' basin fill along the Atlantic coast
 
|'Continental Terminal' basin fill along the Atlantic coast
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Groundwater is thought to leave the basin primarily through evaporation and by pumping at two major water supply well fields near its centre: 100 km east and 165 km southeast of Nouakchott (Friedel and Finn 2008).
 
Groundwater is thought to leave the basin primarily through evaporation and by pumping at two major water supply well fields near its centre: 100 km east and 165 km southeast of Nouakchott (Friedel and Finn 2008).
 
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||Groundwater flows into the aquifer basin from the interior Taoudeni Basin to the east, the Atlantic Ocean from the west, and the Senegal River from the south. Recharge is likely to be restricted by the low precipitation and high evaporation rates (Friedel and Finn 2008).  
Groundwater flows into the aquifer basin from the interior Taoudeni Basin to the east, the Atlantic Ocean from the west, and the Senegal River from the south. Recharge is likely to be restricted by the low precipitation and high evaporation rates (Friedel and Finn 2008).  
 
  
 
Over-abstraction at the two main well fields appears to have caused cones of depression, drawing down the water table and inducing inland migration of salt water from the Atlantic Ocean, creating a plume of saline water for distances of more than 100 km inland from the coast (Friedel and Finn 2008).
 
Over-abstraction at the two main well fields appears to have caused cones of depression, drawing down the water table and inducing inland migration of salt water from the Atlantic Ocean, creating a plume of saline water for distances of more than 100 km inland from the coast (Friedel and Finn 2008).
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Little is recorded about the groundwater potential of these sediments. They are known to provide small local supplies from hand dug wells. Their potential is likely to be limited by low recharge and, particularly in the case of alluvial valley sediments, discontinuous and localised storage potential.
 
Little is recorded about the groundwater potential of these sediments. They are known to provide small local supplies from hand dug wells. Their potential is likely to be limited by low recharge and, particularly in the case of alluvial valley sediments, discontinuous and localised storage potential.
 
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||Recharge is likely to be limited by low rainfall. Direct rainfall recharge is the main source of inflow to dune sands. Infiltration from ephemeral rivers is likely to be a key source of recharge to alluvial aquifers.  
Recharge is likely to be limited by low rainfall. Direct rainfall recharge is the main source of inflow to dune sands. Infiltration from ephemeral rivers is likely to be a key source of recharge to alluvial aquifers.  
 
 
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