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- Wells 125
- Groundwater 59
- Water quality 31
- Agriculture 27
- Aquifers 26
- Irrigation 25
- Politics and government 24
- Technology 18
- Hydrology 17
- Watersheds 16
- Bureaucracy 15
- Demography 14
- Resource allocation 13
- Water consumption 13
- Dams 10
- Economics 9
- Finance 9
- Human settlements 9
- Water-supply 9
- Contamination of environment 8