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- Artificial groundwater recharge 14
- Groundwater 8
- Aquifers 6
- Technology 6
- Water quality 6
- Watersheds 5
- Precipitation (Meteorology) 4
- Climate 3
- Gush Dan (Israel) 3
- Sewage 3
- Dams 2
- Hydrology 2
- Meḳorot (Tel Aviv, Israel) 2
- Rain and rainfall 2
- Reservoirs 2
- Salinity 2
- Sewage--Purification 2
- Biotechnology 1
- Droughts 1
- Eutrophication 1