Moving Elevator Puzzle from UndeadX07c

[MN Lahmar]

Hello guys, using the Moving Elevator Puzzle from UndeadX07c, i want to make the water damage the unit that touches it. Meaning if a unit on an elevator with the height equals to 1, that unit will get damaged every second.

Please i need a solution for this, i beg you to attach the map to your reply if you have a solution (i'm not good with recreating triggers).

Thank you.