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- Reservoirs 52
- Dams 18
- Technology 15
- Irrigation 14
- Water quality 14
- Groundwater 12
- Building 10
- Water-supply 10
- Agriculture 8
- Finance 8
- Hydrology 8
- Water consumption 8
- Bureaucracy 7
- Economics 7
- Drinking water 6
- Water-power 6
- Watersheds 5
- Canals 4
- Pipelines 4
- Politics and government 4
