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- Hydrology 262
- Irrigation 81
- Groundwater 79
- Politics and government 64
- Water quality 62
- Agriculture 61
- Economics 61
- Watersheds 45
- Aquifers 39
- Technology 39
- Demography 37
- Water-supply 37
- Resource allocation 33
- Water-power 31
- Precipitation (Meteorology) 29
- Building 27
- Water diversion 27
- Water consumption 24
- Population 22
- Climate 21