Decades ago when I was hoping to become a scientist, I got a master’s degree dealing with the actions of water in the desert, part of which was studying the hydrology of flash floods on unvegetated bedrock. One term for the result is a “slot canyon.”
When people died in a flash flood in a narrow canyon in Zion years back, NPR brought me on to explain what happened and why. I told listeners that these desert rainstorms touch ground far away and run fast over forty or fifty miles, finding people in a dry...
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