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- Groundwater1,537
- Water quality1,045
- Groundwater flow610
- Aquifers598
- Hydrogeology558
- Water424
- Stream measurements421
- Water-supply331
- Streamflow317
- Hydrology251
- Water table172
- Floods151
- Flood forecasting119
- Nutrient pollution of water111
- Runoff111
- Water levels104
- Pesticides88
- River sediments86
- Sediment transport86
- Suspended sediments84