well this one will be sitting like 4 foot over the water and then you add another 3 for that lip so even if you just roll off the edge, you will still be falling 7 foot before you hit
you should see my cousin's lake ramp. It's 7 feet tall and like 9 feet long. its like a motocross ramp. Gets you like 20 feet above the water if you pin the whole runup