Aroyo's
Heavy rainfall directed into steep valleys does it in California.
Flash floods - a big killer of humans in desert regions.
So far as we know in 2015, Mars does not have any running water to create floods.
Flash floods are floods that happen quickly and without warning. Like they appear in a "flash".
The Floods that happen suddenly are called Flash Floods.
I believe Arizona is prone to occasional earthquakes, sandstorms, and flash floods (in canyons, valleys, etc.), as well as droughts.
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Flash floods are floods that are caused by a storm. Normal floods are caused by non-stop rain.
Flash Floods take place at Canada and Johnstown.
Flash floods are dangerous because they happen suddenly It rains VERY hard, and then it floods up.
In a flash.
Most flash floods occur after late afternoon rainfall.