How do you manage the environmental damage (falling from high altitude, drowning, fire, acid...)? How many wounds do you think will it inflict? Do you use any guide or reference?
I base it on what seems reasonable at the time.
Drowning/Suffocation: I just did this and the PC took a cumulative increasing number of Wounds (1 Wound in round 1, 2 Wounds in round 2, 3 Wounds in round 3)....
Fire/Acid: I would have a set number of Wounds depending on the size/severity. Then if the user doesn't spend X Raises to wipe off the Acid, put the fire out, it does 1 Wound / round after that.
Falling: 1 Wound / 5' of actual 'falling' (Assuming they didn't 'jump down'). I would say reduce distance by 10' if they 'jump' down
I handle falling in "stories" so a hero jumping from a balcony just jumps down. A hero FALLING from a Balcony needs to soak 1 wound.
Higher floors increase the damage by a wound each. and each story is somewhere between 10-15 feet.