flood water of an urban river, huge wave at the wall

water snow winter freezing river ice rapid stream wave waterfall waterway frost blizzard watercourse sea shore flood urban huge wild storm wide riverbed muddy white splashing tall concrete wall created fast former hurricane caused days heavy rain lethal speed city accidents anthropogenic catastrophe climate change desaster disaster disasters disastrous donau elbe environment flowing flash flooded land hazard human instigated maas manmade natural rhone seine thames power