After selecting the pond location in the yard, outline the desired shape with a garden hose.
Before excavating, decide on the depth of the pond.Â Remember, the pond must be 24" deep to house goldfish and should be 36" deep to house koi fish. After excavating, smooth the bottom of the pond with the shovel and clear any foreign material. Spread sand (2" to 3" deep) with the shovel evenly on the entire bottom of the pond. Place the Underlayment in the bottom of the pond.