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- Water quality 10
- Rivers 5
- Irrigation 4
- Wadis 4
- Dams 3
- Groundwater 3
- Hydrology 3
- Reservoirs 3
- Technology 3
- Bureaucracy 2
- Health 2
- Lakes 2
- Politics and government 2
- Riparian areas 2
- Watersheds 2
- Yarmuk River 2
- Aquifers 1
- Canals 1
- Conservation 1
- Contamination of environment 1