My pack is a literal glacier. Between 5" and 9" in spots, my official depth is 7" (at least) and has been since the last significant snowfall on 1/23. There must be 4" of liquid in the pack.
We had an 1" on 1/25, then again on 1/31, but my depth has been locked since the 23rd. That event did include 2" of pure sleet, though.
The nearly 3" of rain that fell on the 1/25 only brought the pack from 12" to 10", and eventually to 8" the following day.