Next I rushed to the oasis to see if the concrete tank there was filling up, but no water was coming down the arroyo. I figured it would any minute (spillway on left behind yellow flower bush).
I turned to photograph a little stream of water running into the arroyo..
...and when I turned back to look up the arroyo the water was coming down.
Soon it was rushing. Ultimately, it filled the big concrete tank half full. I'm pumping out the "settling pond" now which will probably bring it up to 3/4 full.