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- Pipelines 110
- Politics and government 36
- Building 29
- Technology 25
- Economics 23
- Finance 23
- Irrigation 21
- Water-supply 18
- Hydrology 17
- Bureaucracy 16
- Groundwater 14
- Canals 13
- Agriculture 12
- Water quality 11
- Saline water conversion 10
- Water consumption 10
- Aquifers 8
- Drinking water 8
- Water-power 8
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