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Subject
- Water quality145
- Groundwater119
- Water90
- Groundwater flow88
- Stream measurements62
- Hydrogeology60
- Streamflow52
- Aquifers39
- Water-supply32
- Nutrient pollution of water27
- Hydrology21
- Floods19
- Water table19
- Water quality biological assessment18
- Flood forecasting16
- Water withdrawals16
- Pesticides14
- Runoff14
- Suspended sediments12
- Land use11