Flooding Yamuna River Flood Management Colorado River Ganga River Tajo River Pollution Elbe River Ganga Ganges River Chenab River Godavari River Flood Levels Flood Risk Water Sharing Irrigation Brahmaputra Pollution Control Safety Measures Dam Management Periyar River Mahanadi River Tungabhadra River Danube River Elbe Guadalupe River Mhadei River Biodiversity Beas River Chalk Streams Flow Management Erosion Dams International Rivers Inflows Krishna River Flood Risks Panchganga River Conservation Wastewater Management Mithi River River Management Ravi River St. John River Reservoirs Monsoon San Juan River Monsoon Season Mullaperiyar River Brahmaputra River Lerma River Mississippi River Kosi River Flooding Risks River Flow Changes Río Grande Hydrology Jhelum River Endangered Rivers Cauvery River Ganges Ulla River