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- Water quality 20
- Building 5
- Agriculture 4
- Bureaucracy 4
- Contamination of environment 4
- Finance 4
- Sewage--Purification 4
- Groundwater 3
- Hydrology 3
- International regimes 3
- Irrigation 3
- Sewage 3
- Technology 3
- Water-power 3
- World Bank 3
- Climate 2
- Dams 2
- Natural resources--Co-management 2
- Politics and government 2
- Precipitation (Meteorology) 2
