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Subject
- Water quality46
- Groundwater44
- Stream measurements34
- Groundwater flow26
- Water18
- Stream-gaging stations16
- Streamflow16
- Aquifers10
- Hydrogeology10
- Sediment transport10
- Water chemistry10
- River channels9
- Nutrient pollution of water8
- Runoff8
- Water table7
- Hydrology6
- Reservoirs5
- Urban runoff5
- Water quality management5
- Escherichia coli4