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- Irrigation 334
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- Hydrology 81
- Groundwater 80
- Technology 72
- Economics 71
- Water quality 52
- Building 51
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- Resource allocation 44
- Water-power 44
- Water consumption 42
- Dams 41
- Water diversion 41
- Bureaucracy 36
- Demography 35
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- Precipitation (Meteorology) 32
- Watersheds 32