Often overlooked, the design of the back of your waterfall matters too! We generally address this area of the project in two ways: with a beautifully, planted slope (most cost effective) or by building a boulder wall to retain the backside (usually required if space is constrained or if needed to cover other structures such as pool equipment). As what matters most is what you see most, we generally suggest sloping the backside and focusing your assets on the frontside of your project.