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- Irrigation 22
- Agriculture 15
- Hydrology 12
- Watersheds 10
- Water consumption 9
- Precipitation (Meteorology) 7
- Water-supply 7
- Dams 5
- Groundwater 5
- Soils 5
- Demography 4
- Canals 3
- Finance 3
- Geomorphology 3
- Population 3
- Water-power 3
- Aquifers 2
- Biqāʻ Valley (Lebanon) 2
- Climate 2
- Hydrography 2