Don't quote me on this but I believe 250 ft over water is about 95% to 97% death chance . So I would guess maybe a 90%- to 95% chance with 230 ft over water. But make sure to do your own research. Statistics I have read imply that the speed hitting the water from that height may be about 65 mph. It may not be a super quick or painless death. As mentioned above, it may result in death by drowning some moments later.