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- Saline water conversion 161
- Technology 88
- Water quality 57
- Economics 53
- Irrigation 42
- Hydrology 37
- Agriculture 33
- Building 31
- Groundwater 31
- Reverse osmosis 25
- Politics and government 23
- Aquifers 19
- Finance 19
- Sewage 16
- Resource allocation 14
- Water--Purification--Distillation process 14
- Water-supply 14
- Water consumption 13
- Industries 12
- Brackish waters 11