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|Superficial aquifer system
 
|Superficial aquifer system
'''Unconsolidated Aquifer: High to Very High Productivity'''
 
 
||The Superficial aquifer system includes Quaternary and Tertiary sediments. It covers the whole Senegal sedimentary basin. It is dominantly made of sand and sandy clay, which vary in proportion across its extent. The aquifers are intergranular, and the best groundwater potential occurs in sand layers. It comprises the following aquifers: infrabasaltic (occurs below basalts), Thiaroye, Littoral Nord, alluvial (Quaternary); and Continental Terminal and Oligo-Miocene aquifers (Tertiary). This aquifer system overlies more consolidated sediments of the Eocene, Palaeocene, and the Maastrichtian (Tertiary) - described below.
 
||The Superficial aquifer system includes Quaternary and Tertiary sediments. It covers the whole Senegal sedimentary basin. It is dominantly made of sand and sandy clay, which vary in proportion across its extent. The aquifers are intergranular, and the best groundwater potential occurs in sand layers. It comprises the following aquifers: infrabasaltic (occurs below basalts), Thiaroye, Littoral Nord, alluvial (Quaternary); and Continental Terminal and Oligo-Miocene aquifers (Tertiary). This aquifer system overlies more consolidated sediments of the Eocene, Palaeocene, and the Maastrichtian (Tertiary) - described below.
  
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|Intermediate aquifer system
 
|Intermediate aquifer system
'''Consolidated Sedimentary Aquifer: High to Very High Productivity'''
 
 
||The Intermediate aquifer system lies below the Superficial aquifer system. It includes Eocene and Palaeocene formations (Tertiary), and mainly comprises limestone, often karstic or affected by faults.  
 
||The Intermediate aquifer system lies below the Superficial aquifer system. It includes Eocene and Palaeocene formations (Tertiary), and mainly comprises limestone, often karstic or affected by faults.  
  
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|Deeper aquifer system
 
|Deeper aquifer system
'''Consolidated Sedimentary Aquifer: High to Very High Productivity'''
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||The deeper aquifer system, of Maastrichtian age, extends across the whole of the Senegalo-Mauritanian basin and generally consists of sand, sandy-clay and calcareous sandstone. Groundwater storage and flow are largely intergranular. This aquifer constitutes the main source of groundwater supply in Senegal.  It is a transboundary system.
||The deeper aquifer system, of Maastrichtian (Cretaceous) age, extends across the whole of the Senegalo-Mauritanian basin and generally consists of sand, sandy-clay and calcareous sandstone. Groundwater storage and flow are largely intergranular. This aquifer constitutes the main source of groundwater supply in Senegal.  It is a transboundary system.
 
  
 
The deeper aquifer system is about 250 m thick, with a water table depth between a few metres to 140 metres depth.  Typical borehole depth varies between 25 to 680 m. It is typically highly productive, although aquifer properties vary according to local characteristics (lithology, thickness, etc.). Where there are thick clay sequences, the aquifers can be semi-confined or confined. Typical values for aquifer parameters for the deeper aquifer system are:
 
The deeper aquifer system is about 250 m thick, with a water table depth between a few metres to 140 metres depth.  Typical borehole depth varies between 25 to 680 m. It is typically highly productive, although aquifer properties vary according to local characteristics (lithology, thickness, etc.). Where there are thick clay sequences, the aquifers can be semi-confined or confined. Typical values for aquifer parameters for the deeper aquifer system are:
  
 
*Permeability = 1 x 10<sup>-5</sup> m/s
 
*Permeability = 1 x 10<sup>-5</sup> m/s
*Transmissivity = 0.95 – 652,578 m²/day
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*Transmissivity = 0.95 – 652578 m²/day
 
*Storage coeffiecient =  1 x 10<sup>-4</sup> – 6 x 10<sup>-4</sup>  in the western central part
 
*Storage coeffiecient =  1 x 10<sup>-4</sup> – 6 x 10<sup>-4</sup>  in the western central part
 
*Borehole yield = 80 – 362 m³/h
 
*Borehole yield = 80 – 362 m³/h

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