We moved in 2015 to a 55 and over a village in Wilmington Delaware.
The pond about 30 inches deep at the deepest point a spillway about
30 feet going up toward the barn and another smaller pond about 2000 gallon.
Pump in the deepest part of the 6000-gallon pond with one inch PVC pipeline pumping the water to the upper pond and then overflowed into the spillway down to the 6000 Gallon Pond.
Birds were always happy including the Great Blue Heron who would feast on the goldfish.
The liner for the pond was PDF rubber.
Dug the pond out with a shovel and pick in 1990.
Paulette made sure I stayed to specifications with the transit level

.