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Transboundary Aquifers Methodologies Results Problems of scale Future challenges

Transboundary Aquifers Methodologies Results Problems of scale Future challenges Willi Struckmeier IAH President. Results of the UNECE Study, on the basis of questionnaires 1997. Transboundary Aquifer Systems. Source: UNESCO / ISARM 2001.

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Transboundary Aquifers Methodologies Results Problems of scale Future challenges

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  1. Transboundary Aquifers • Methodologies • Results • Problems of scale • Future challenges • Willi Struckmeier • IAH President

  2. Results of the UNECE Study, on the basis of questionnaires 1997

  3. Transboundary Aquifer Systems Source: UNESCO / ISARM 2001

  4. Global Map of Transboundary Aquifer Systems

  5. Future challenges • Harmonise methodologies • Classify TBA‘s according to typology • Develop a homogeneous global map

  6. Transboundary Aquifer Constellations after Eckstein & Eckstein 2005 • Phreatic aquifer • GW connected to river • Countries sharing the same aquifer

  7. Phreatic (water table) aquifer • River connected to GW in aquifer • Inflow of river water from uphill state A across border • State A outside aquifer, just connected by river

  8. Confined, deep aquifer • No relation with surface water • Recharge (free water table) only in state A, but confined aquifer shared by states A and B • = what, if state B heavily abstracts confined GW and lowers GW table?

  9. Usual setting for aquifers with non-renewable GW • Deep water table • Little or no gradient • No surface water and no connection with GW

  10. Thank you

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