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- Hydrology 75
- Irrigation 34
- Agriculture 22
- Groundwater 22
- Technology 17
- Economics 16
- Politics and government 14
- Water quality 13
- Aswan High Dam (Egypt) 12
- Watersheds 11
- Building 10
- Dams 10
- Water-supply 10
- Demography 9
- Resource allocation 9
- Canals 7
- Saline water conversion 7
- Aquifers 6
- Water-power 6
- Climate 5
