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- Water consumption 372
- Agriculture 103
- Irrigation 83
- Bureaucracy 81
- Groundwater 70
- Water-supply 70
- Politics and government 67
- Economics 64
- Water quality 57
- Water-power 52
- Demography 48
- Hydrology 46
- Aquifers 42
- Finance 41
- Dams 39
- Technology 38
- Precipitation (Meteorology) 29
- Recycling 26
- Water reuse 23
- Building 21