Rivers Water quality 20 Water 9 Pollution 8 Hydraulic engineering 6 Hydrodynamics 6 Recreational use 5 Stream ecology 5 Arduino (Programmable controller) 4 Channels (Hydraulic engineering) 4 Fly fishing 4 Lakes 4 Paleolimnology 4 Photovoltaic power system 4 Programming 4 Regulation 4 River engineering 4 Sediments (Geology) 4 Storm sewers 4 Urbanization 4 Water quality management 4 Water resources development 4 Fluvial geomorphology 3 Geomorphology 3 Hydrology 3 River channels 3 Stream measurements 3 Aquatic biology 2 Australia 2 Case studies 2