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- Irrigation 101
- Agriculture 41
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- Groundwater 32
- Water-power 28
- Watersheds 21
- Politics and government 20
- Resource allocation 17
- Technology 17
- Economics 16
- Precipitation (Meteorology) 16
- Building 15
- Dams 15
- Water quality 15
- Water diversion 14
- Finance 12
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- Yarmuk River 11
- International regimes 9