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Subject
- Water quality86
- Groundwater70
- Water62
- Groundwater flow54
- Hydrogeology37
- Stream measurements30
- Streamflow29
- Water-supply26
- Aquifers23
- Nutrient pollution of water18
- Hydrology13
- Pesticides11
- Runoff11
- Water table11
- Water withdrawals11
- Water quality biological assessment10
- Floods9
- Suspended sediments9
- Flood forecasting8
- River sediments8