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Topic
- Hydrology 40
- Irrigation 23
- Water quality 14
- Building 12
- Resource allocation 12
- Groundwater 11
- Technology 11
- Finance 9
- Politics and government 9
- Water diversion 9
- Water--Storage 8
- Dams 7
- Economics 7
- Agriculture 6
- Negotiation 6
- Water-power 6
- Refugees 5
- Armistices 4
- Bureaucracy 4
- Canals 4