I'm researching it for a computer game mechanics change (the game is free and open source, I'm not doing it for profit). The question is: at what height it is theoretically possible for an average and reasonably healthy human to sustain any injury on impact with water provided that water has unlimited depth and nothing in it and ignoring any injuries that happen after the fall is stopped by the water?
I've found ICD-10 code that might help discover some statistics:
W16.112A: Fall into natural body of water striking water surface causing other injury
but I still have to find any dataset where height was recorded.
Maybe there is a safety standard that have an answer?