How do I make the player get hurt if they jump in 1 block or less deep water from a high altitude?

When player tick update:

• If [Y velocity of [event / target entity] > 2.3] and [block at [x] [y - 1] [z] = water]:
  • Deal [8] attack damage to [event/target entity] type: [FALL]

and if block at (x) (y-1) (z) is water,it is two or more blocks deep,don't deal damage