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===Groundwater Quality===
 
===Groundwater Quality===
  
Selected groundwater quality parameters were interpreted by a USGS study, including bicarbonate, nitrate, sulphate, specific electrical conductivity (used as an indicator of total dissolved solids (TDS) and salinity) and dissolved oxygen (Friedel and Finn 2008). These data are limited and spatially biased to the Continental Terminal Basin (Tertiary to Quaternary unconsolidated marine and continental sediments) and southern portions of the Taoudeni Basin (probably Precambrian Metasedimentary or younger Cambrian-Carboniferous sedimentary aquifers). A summary of the chemistry data is shown in the table below (from Friedel and Finn 2008).
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Selected groundwater quality parameters were interpreted by a USGS study, including bicarbonate, nitrate, sulphate, specific electrical conductivity (used as an indicator of total dissolved solids (TDS) and salinity) and dissolved oxygen (Friedel and Finn 2008). These data are limited and spatially biased to the Continental Terminal Basin (Tertiary to Quaternary unconsolidated marine and continental sediments) and southern portions of the Taoudeni Basin (probably Precambrian Metasedimentary or younger Cambrian-Carboniferous sedimentary aquifers).
  
 
'''Summary of groundwater quality parameters from Friedel and Finn (2008) (Table 5)'''
 
'''Summary of groundwater quality parameters from Friedel and Finn (2008) (Table 5)'''
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<sup>2</sup> Parenthesis indicates number of values at or below limit of detection.  
 
<sup>2</sup> Parenthesis indicates number of values at or below limit of detection.  
  
In most of the areas where data were collected, most groundwater was considered fresh (TDS < 1000 mg/l), but there were significant areas of high salinity. The largest relates to a major saline intrusion from the Atlantic Ocean into the coastal basin aquifer, apparently caused by over-pumping at two major water supply well fields. Two smaller areas of brackish groundwater were revealed in the south-central Taoudeni Basin just west of Kipa, and between Kipa and 'Ayoun el Atrous. The elevated salinity contours appear elongated in a north-south trend that coincides with apparent groundwater flow paths discharging into the Senegal River (Friedel and Finn 2008 - see also map in that report, Figure 4).
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In most of the areas where data were collected, most groundwater was considered fresh (TDS < 1000 mg/l), but there were significant areas of high salinity. The largest relates to a major saline intrusion from the Atlantic Ocean into the coastal basin aquifer, apparently caused by over-pumping at two major water supply well fields. Two smaller areas of brackish groundwater were revealed in the
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south-central Taoudeni Basin just west of Kipa, and between Kipa and 'Ayoun el Atrous. The elevated salinity contours appear elongated in a north-south trend that coincides with apparent groundwater flow paths discharging into the Senegal River (Friedel and Finn 2008).
  
 
==Groundwater management and use==
 
==Groundwater management and use==

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