Most places have rivers. In the desert, we have washes. Dry ones. They are called arroyos. They fill up when it rains and then they dry up. Sometimes they REALLY fill up.
When it rains the water causes a flash flood.
Some arroyos are really deep and wide. One of the largest is the Santa Cruz river. It is dry for most of the year.
Here are a couple of photos to help give you a perspective of what it looks like when it is dry or kind of dry like the photo directly below.
|Photo by lasertrimman|
|Photo by R.S. Walker|
But then it rains and the excitement begins.
|Photo by kiqwi|
|Photo by kevinlane2|