I've had two requests for pool-waterfalls in the past month. I live in the Northeast and usually spend a large portion of the winter planning some of the bigger jobs for the upcoming season. We've never done pool waterfalls, but I do have pool experience and several connections with competent pool contractors and we have a good amount of experience building water features. Does anyone have any experience with waterfalls going into pools? Should I rely on the polymer-concrete walls for support or should I construct a separate concrete footing?