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Topic
- Aquifers 188
- Groundwater 120
- Watersheds 62
- Hydrology 50
- Economics 48
- Water quality 43
- Demography 41
- Water consumption 41
- Irrigation 37
- Agriculture 35
- Politics and government 30
- Technology 27
- Recycling 25
- Water reuse 24
- Precipitation (Meteorology) 23
- Resource allocation 21
- Wells 21
- Saline water conversion 19
- Water-supply 17
- Contamination of environment 14