Editing Hydrogeology of Democratic Republic of the Congo

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|Precambrian Basement and Metasedimentary
 
|Precambrian Basement and Metasedimentary
||Low to Moderate
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||Low
 
||Crystalline basement rocks and highly metamorphosed metasediments and metavolcanic rocks form local aquifers where they have developed weathered and/or fractured zones. These usually have low productivity, but occasionally moderate. Transmissivity values of 1 to 50 m<sup>2</sup>/day, and rarely up to 100 m<sup>2</sup>/day, have been recorded, and yields of 0.2 to 1.7, and rarely up to 3.5, l/s (20 to 150 (rarely up to 300) m<sup>3</sup>/day). Aquifer properties are controlled by the depth of weathering (regolith) and the degree of fracturing of un-weathered bedrock. Fractured bedrock alone can sometimes supply relatively good yields, but has low storage and cannot sustain these yields in the long term. Weathered regolith (which is up to 30 m thick in the oriental provinces) can provide additional storage.  
 
||Crystalline basement rocks and highly metamorphosed metasediments and metavolcanic rocks form local aquifers where they have developed weathered and/or fractured zones. These usually have low productivity, but occasionally moderate. Transmissivity values of 1 to 50 m<sup>2</sup>/day, and rarely up to 100 m<sup>2</sup>/day, have been recorded, and yields of 0.2 to 1.7, and rarely up to 3.5, l/s (20 to 150 (rarely up to 300) m<sup>3</sup>/day). Aquifer properties are controlled by the depth of weathering (regolith) and the degree of fracturing of un-weathered bedrock. Fractured bedrock alone can sometimes supply relatively good yields, but has low storage and cannot sustain these yields in the long term. Weathered regolith (which is up to 30 m thick in the oriental provinces) can provide additional storage.  
  

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