Editing Hydrogeology of Madagascar

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| Alluvium; Sand dunes (ancient to recent); Beach sand. Quaternary and Tertiary (Neogene)
 
| Alluvium; Sand dunes (ancient to recent); Beach sand. Quaternary and Tertiary (Neogene)
 
||Western; Diego-Suarez; Côte-Est  
 
||Western; Diego-Suarez; Côte-Est  
||Variable: Low-Moderate to Very High
+
||Variable: Low/Moderate to Very High
 
||Alluvium forms a local but often high yielding aquifer in many river valleys, both in the Highlands Precambrian zone and in the sedimentary basins. Alluvium overlies the older rocks, and is typically up to 25 m thick. Borehole yields of 10 to 30 l/sec have been recorded – e.g. in the Ampotaka-Menarandra and Ademaka areas. However, many lower yields of between < 1 and 10 l/s are also recorded. There are records of permeability values of between 40 and 450 m/day and transmissivity values of between 40 and over 2000 m2/day (UN 1988).
 
||Alluvium forms a local but often high yielding aquifer in many river valleys, both in the Highlands Precambrian zone and in the sedimentary basins. Alluvium overlies the older rocks, and is typically up to 25 m thick. Borehole yields of 10 to 30 l/sec have been recorded – e.g. in the Ampotaka-Menarandra and Ademaka areas. However, many lower yields of between < 1 and 10 l/s are also recorded. There are records of permeability values of between 40 and 450 m/day and transmissivity values of between 40 and over 2000 m2/day (UN 1988).
  
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|Middle and Upper Jurassic carbonate and sandstone aquifers  
 
|Middle and Upper Jurassic carbonate and sandstone aquifers  
 
||Western; Diego-Suarez
 
||Western; Diego-Suarez
||Low-Moderate to High
+
||Low/Moderate to High
 
|| Can be unconfined or confined, sometimes artesian.  
 
|| Can be unconfined or confined, sometimes artesian.  
  

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