Yes there is a 12 inch, plus and emergency overflow.
I first thought it was spring fed, but I'm not sure anymore. The ground water has slowed way down with all the high temps and lack of rain. We got an inch the other day and it looks like it was running a little stronger. Naturally every dang storm has went around us so we are missing out on the big rains, which may be a blessing.
If you notice the sides a bit steeper than what I've seen in other pictures, so I can see it eroding some.
