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- Agriculture 4
- Hydrology 4
- Irrigation 4
- Watersheds 3
- Climate 2
- Dams 2
- Precipitation (Meteorology) 2
- Water-supply 2
- Aquifers 1
- Barrages 1
- Bibliography 1
- Canals 1
- Demography 1
- Evaporation 1
- Evapotranspiration 1
- Geology 1
- Geomorphology 1
- Groundwater 1
- Hydrogeology 1
- Hydrography 1
