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- Recycling 29
- Economics 26
- Aquifers 24
- Demography 24
- Water consumption 23
- Water reuse 23
- Hydrology 3
- Resource allocation 3
- Sewage 3
- Groundwater 2
- Hydrogeology 2
- Negotiation 2
- Politics and government 2
- Water diversion 2
- Agriculture 1
- Animals 1
- Archaeology 1
- Health 1
- International law 1
- Negev (Israel) 1