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- Irrigation 8
- Hydrology 7
- Agriculture 5
- Precipitation (Meteorology) 3
- Water-supply 3
- Watersheds 3
- Canals 2
- Dams 2
- Land tenure 2
- Soils 2
- Water consumption 2
- Aquifers 1
- Building 1
- Climate 1
- Economics 1
- Groundwater 1
- Livestock 1
- Maps 1
- Rain and rainfall 1
- Reservoirs 1