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- Water quality 7
- Politics and government 6
- Technology 5
- Water consumption 5
- Contamination of environment 4
- Hydrology 4
- Irrigation 4
- Water-supply 4
- Agriculture 3
- Bureaucracy 3
- Economics 3
- Sewage--Purification 3
- Water--Purification 3
- Arabah Valley (Israel and Jordan) 2
- Canals 2
- Demography 2
- Drainage 2
- Groundwater 2
- Population 2
- Precipitation (Meteorology) 2