Turn the water wall copper-side down and slip the sheer descent into place, securing it according to the manufacturer's instructions. Slide the last 4x4 support piece between the two posts, positioning it so that it serves as a floor for the sheer descent. Attach the support with screws.
Fit the vertical posts into the pre-dug holes by the water feature basin. Make sure the copper wall is centered, with the basin directly in front, before securing into place. Dry-set the posts with dry cement mix.