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Isotope Techniques in Water Resources Assessment: Insights from Various Regions

Explore findings of isotope techniques in water resource assessments across diverse regions, revealing groundwater recharge rates, origin, and vulnerability to pollution. Discover connections between surface water and groundwater, transit times, and more.

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Isotope Techniques in Water Resources Assessment: Insights from Various Regions

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  1. Contribution of Isotope Techniques to Water Resources Assessment Mebus A. Geyh 5th IHP/IAHS George Kovacs Colloquium UNESCO, Paris, 2 - 3 June 2000

  2. Khartoum, Sudan How much more groundwater can be pumped for the drinking water supply ?

  3. 1963/1964

  4. Conclusion • Present-day groundwater recharge by the Nile river is about 20% of the pumping rate. • Mainly fossil groundwater is pumped for the drinking water supply recharged some 4000 yr BP. • The piezometric surface is mainly the relict of the palaeo-groundwater.

  5. Thar Desert, Pakistan Is fresh groundwater recharged ?

  6. Cholistan Area of hydrogeological reconnaissance 15,500 km2 habitants300,000 heads of animals 2,000,000 minimum temperature -3°C maximum temperature +50°C annual precipitation rate<200 mm/yr potential evaporation rate -2700 mm/yr

  7. 10.000 mio m3/yrfresh groundwater in the Thar desert ! • How largewas the groundwater recharge rate ? • When was the fresh groundwater recharged ? • Howwas the fresh groundwater recharged ?

  8. Conclusion • Recharge occurred between 16,000 to 4000 yr BP. • Recharge rate was about 5 mm/yr in the past while that of today is around 1 mm/yr. • Recharge occurred from innundations of the Old Hakra River.

  9. Bandung, Indonesia

  10. Drinking Water for Bandung • Are the Lembang and Bandung Basins hydraulicallyconnected ? • How large is the vulnerability to pollutethe fesh water resources ?

  11. Lembang water

  12. Conclusion • More than 30% of the pumped water is recharged in the Lembang Basin. • The residence time of the pumped ground- water ranges from 1000 to 10,000 yr.

  13. Potential of Isotope Hydrological Methods • Geohydraulic parameters • aquifer architecture • hydraulic conductivity • paleohydrological situation • Water components of the hydrological cycle • origin of water components • sources of and vulnerability to pollution • Groundwater movement and mass transport • pathways, recharge and discharge areas • transit and residence times / water balance • estimation of recharge and discharge rates • interconnection of surface water and groundwater • mixing processes and ratios (e.g. salinization) • tracing overexploitation and re-use of waste water

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