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- Groundwater1,531
- Water quality1,041
- Groundwater flow600
- Aquifers596
- Hydrogeology554
- Stream measurements419
- Water417
- Water-supply329
- Streamflow315
- Hydrology248
- Water table172
- Floods150
- Flood forecasting119
- Nutrient pollution of water109
- Runoff109
- Water levels104
- Pesticides87
- River sediments86
- Sediment transport86
- Suspended sediments84