This is a thing I want to make, how did you do it? I have made similar things for zoo exhibits using fiberglass and concrete.
Artist Reply: There were no fiberglass structures around when I made this waterfall. I started with a big hole. Used an old swimming pool liner for the base and built up the cement for the tank to hold the water. At the back I just built up stones and cement. Put in plastic piping for the water hose and another for the electric cords. , within the cement and stone striucture. I have a wooden structure, a box at the back for the plugins. I have two water pumps in the basin. The cord goes through one liner and the tubing goes through the other to the box in the back of the structure. I made a kind of a blue print before I started the project. O yes I also have a plastic hose for the light bulbs that is also inserted in the structure. My husband put in the wiring for me. We turn it on at the house. This was built about 20 years ago. It took me 3 months to build.
I planted trees behind it, now there is a leak in my fountain. Every spring I just make a paste of portland cement and water and paint in on with an old brush and it holds the water for the whole summer.