flood waves at big walls in the river, returning waves at the walls

water river rapid stream wave winter snow sea shore ice rock freezing watercourse waterway coast waterfall geology flood waves big walls crashing wild storm wide urban riverbed muddy white splashing tall concrete wall huge created fast former hurricane caused days heavy rain lethal speed city returning disaster catastrophe climate change climate environment desaster disastrous natural hazard human instigated disasters anthropogenic caused manmade flood flooded water flash accidents power flooded land shore flowing flowing river stream freshwater rivers flow moving supply riverbed