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- Hydrology 213
- Irrigation 73
- Groundwater 61
- Politics and government 57
- Agriculture 53
- Economics 50
- Water quality 45
- Technology 41
- Resource allocation 32
- Aquifers 31
- Water-power 31
- Watersheds 28
- Water diversion 27
- Building 25
- Water-supply 25
- Demography 24
- Canals 16
- Saline water conversion 16
- Armed Forces 15
- Precipitation (Meteorology) 15
