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- Groundwater 34
- Watersheds 34
- Hydrology 17
- Aquifers 11
- Precipitation (Meteorology) 10
- Water quality 9
- Irrigation 7
- Climate 6
- Agriculture 5
- Hydrogeology 5
- Springs 5
- Water-supply 5
- Soils 4
- Yarmuk River 4
- Contamination of environment 3
- Demography 3
- Economics 3
- Population 3
- Wadis 3
- Water balance (Hydrology) 3