Water Conservation, or not?

What exactly is going on in this photo?  Aside from the trio of pool toys, notice the concrete edge of the pool.  Then notice the water that is, yes, right AT the edge of the pool.  Normally, the water doesn't start until 5 inches below this. But Rich we forgot to turn off the garden hose when we refilled the pool. And yes, we live in the desert, and should be conserving water, not wasting it! Bad mistake! Lesson learned: set a timer when turning on the garden hose!