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- Hydrology 189
- Irrigation 66
- Groundwater 53
- Politics and government 52
- Economics 47
- Agriculture 45
- Water quality 39
- Technology 33
- Resource allocation 31
- Water-power 29
- Aquifers 28
- Water diversion 26
- Watersheds 24
- Building 23
- Water-supply 23
- Demography 22
- Armed Forces 14
- Canals 14
- Water consumption 14
- Yarmuk River 14