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Subject
- Water quality144
- Groundwater117
- Water88
- Groundwater flow83
- Stream measurements60
- Hydrogeology58
- Streamflow50
- Aquifers39
- Water-supply31
- Nutrient pollution of water25
- Hydrology21
- Water table19
- Floods18
- Water quality biological assessment17
- Flood forecasting16
- Water withdrawals16
- Pesticides13
- Runoff13
- Suspended sediments12
- Land use11