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Subject
- Water quality214
- Groundwater112
- Water-supply91
- Water47
- Aquifers32
- Stream measurements19
- Water resources development19
- Hydrology18
- Water table17
- Nutrient pollution of water16
- Water use16
- Pesticides13
- Suspended sediments11
- Water consumption11
- Groundwater flow9
- Water quality biological assessment9
- River sediments8
- Flood forecasting7
- Lakes7
- Water levels7