Our pond is about 40 feet from a creek and no problems of leaking into the creek nor over flow. We have a 4" drain tile that sets our full pool and drains back to the creek. We fill our pond from the creek too with two pumps.
Red line going to red circle is the water in from the creek that then flows over a waterfall into the pond. Red line by its self is the over flow drain to the creek.
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