If strong enough, flash floods can be bad for the environment. The strong pull of water can erode or destroy buildings and drainage systems allowing toxic materials to enter into bodies of waters / waterways. Coastal areas can erode from the flooding. If erosion is not fixed, more flooding can occur. According to one source, flash flooding does have one slight positive impact in spreading nutritional sediments to topsoil that otherwise may not receive the needed nutrients. With 150 people killed annually, flooding is the number one cause of weather related deaths.
200 deaths per year is an average for the US. World wide, the number of annual deaths from flooding has been estimated as high as 25,000 per year.
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