Just remember that in a pond with springs, that the water level is dependent upon the water pressure in the pond. i.e. a spring does not have a one way valve. In times of low rainfall, the pond will drop.
Personal experience here. My pond has "springs" in it. It will and has dropped 6 feet from full pool. So, my 1+ acre pond is around 1/2 acre when that happens, which lately has been 10 months of the year.........
