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Topic
- Irrigation 25
- Hydrology 18
- Agriculture 17
- Watersheds 12
- Water consumption 10
- Dams 7
- Groundwater 7
- Precipitation (Meteorology) 7
- Water-supply 7
- Demography 5
- Soils 5
- Water-power 4
- Aquifers 3
- Canals 3
- Finance 3
- Geomorphology 3
- Politics and government 3
- Population 3
- Biqāʻ Valley (Lebanon) 2
- Climate 2