Hey everyone I have a question for ya'll

I have a pond and a creek, to a hidden pond layout. When I run the
pump, the upper pond fills up and runs down the creek. I say fills up
because when the pump isn't running, it settles about 4 inches. If I
adjust the part that goes into the creek, the pond will overflow its
banks. Same with the creek, I run it right to the edge of flooding.

When the pump is off, everything settles down a few inches. Any
suggestions on how to keep the pond and creek from overflowing, and
still raise the waterlevel?