It all depends what type of structure you would like to build but with it being about 3' tall you would not need to use any type of rubber liner. All solid concrete. None of that foam crap you see those guys making cheap waterfalls. also rebar is a must to help hold it from sliding. I have just built waterfeature that his about 5' high that spills into my 4' raised spa. About every 2 feet back I went I made an 18" deep x 16" x 4' wide footing w/ rebar so my structure wont slide down my hill. there are many steps into building waterfeatures. plumbing, water sealing, cementious overspray your whole rock work so that the acid stain will be consitant through-out, staining, etc. Here is a photo of my water feature that I am almost finished with , I am also a first timer good luck
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