Some terrains use tides, which cause the water level to change with time. Thus, some scripts relying on the ASL value of 0 being almost the same as water surface (ignoring waves ofc) will be broken.
There's no command to know what the water level offset is.
The only command that might help in this situation is `getPosASLW`, but the value includes waves, and it only works if the position is on water.
Such position might be impossible to find unless you do a full terrain heightmap scan to find the minimum terrain height and use that as the reference point, which is extremely slow to do.
Thus having a command that returns this value for the given time will be extremely helpful:
returns the water depth offset from ASL value 0.