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Topic
- Sewage 198
- Water quality 88
- Technology 55
- Building 49
- Groundwater 40
- Irrigation 40
- Bureaucracy 38
- Agriculture 36
- Finance 36
- Contamination of environment 32
- Water-supply 27
- Economics 26
- Hydrology 26
- Politics and government 22
- Demography 18
- Water--Purification 18
- Saline water conversion 16
- Water consumption 16
- Resource allocation 15
- Dams 13
