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- Erosion 25
- Agriculture 15
- Irrigation 14
- Watersheds 10
- Precipitation (Meteorology) 8
- Dams 6
- Groundwater 6
- Droughts 5
- Soils 5
- Water quality 5
- Finance 4
- Building 3
- Climate 3
- Floods 3
- Health 3
- Sedimentation and deposition 3
- Technology 3
- Water balance (Hydrology) 3
- Water-supply 3
- Arid regions 2