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Topic
- Irrigation 51
- Agriculture 43
- Hydrology 35
- Watersheds 35
- Water-supply 23
- Politics and government 22
- Precipitation (Meteorology) 22
- Dams 20
- Water-power 18
- Economics 17
- Groundwater 17
- Demography 16
- Aquifers 14
- Water consumption 12
- Climate 11
- Thawrah (Syria) 8
- Building 7
- Canals 7
- Geomorphology 7
- Hydrogeology 7
