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Maréchal Jean-Christophe - Hydrogeologist - Karst & fractured aquifers

Hydrogéologue - Aquifères fracturés et karstiques

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Fractured crystalline aquifers
Karst aquifers
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Piece 5 - Local and Regional Groundwater Flows

Is the aquifer connected?

The connectivity of a basement aquifer changes with groundwater level.


Key findings

HIGH WATER LEVEL

Active zone saturated

→ large horizontal connectivity
→ regional flows
→ large recharge areas

LOW WATER LEVEL

Active zone partly unsaturated

→ disconnected compartments
→ local flow systems
→ smaller recharge areas


💡

Why does it matter? 

Water management 
The same aquifer may behave as a relatively connected system during high groundwater levels and as a strongly compartmentalized system during low-water conditions. 

Fractured crystalline aquifer connectivity is dynamic: it depends on the saturation state of the shallow permeable zone.

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