I’d have thought that the desert, being, you know, sorta dry, could absorb all kinds of water without any problem. That when the rains came, the water would disappear without a trace, sucked up by the parched land.
I was wrong.
Flash flooding occurs when it rains rapidly on saturated soil
or dry soil that has poor absorption ability.
The runoff collects in gullies and streams and,
as they join to form larger volumes,
often forms a fast flowing front of water and debris.
Here in the Phoenix area, the key is “dry soil that has poor absorption ability.”
In February, some parts of the valley had three inches of rain in 24 hours. This is what that looked like where I was. I’ve never seen reflections of saguaro cactuses before.