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Subject
- Groundwater88
- Aquifers57
- Water quality48
- Groundwater flow38
- Water-supply21
- Stream measurements20
- Water17
- Water table17
- Hydrogeology15
- Runoff13
- Streamflow13
- Arsenic8
- Water quality management7
- Flood forecasting6
- Floods6
- Hydrology6
- Precipitation (Meteorology)6
- Stream-gaging stations6
- Water quality biological assessment6
- Basins (Geology)5