The storm has passed. The water has worked it's way into the canyon. It runs along the canyon floor at a good speed. As it flows it is absorbed into the sand. Every inch of travel leaves less water for the next yard of thirsty sand. At this point the water is only inches deep and it runs out just around the bend. New birth and also death. In between rains the canyon floor becomes home to sage brush, rabbit brush and other small plants When the rains come, the canyon floor is sweep clean to start over again. This is replayed 2 maybe 3 times each year. Begin and end, begin and end. Dosen't make much sense to us, but it is the way of the desert.