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Topic
- Reservoirs 150
- Dams 38
- Irrigation 31
- Groundwater 29
- Hydrology 24
- Technology 24
- Water quality 22
- Agriculture 18
- Watersheds 18
- Building 16
- Economics 14
- Water-power 13
- Water-supply 13
- Finance 12
- Bureaucracy 11
- Water consumption 10
- Aquifers 9
- Rivers 7
- Demography 6
- Drinking water 6
