There's a
UK AIC that says 'For JAR-OPS performance purposes, runways reported as WATER PATCHES or FLOODED should be considered as CONTAMINATED'.
Here in the UK, when there's snow or ice on the runway, we give a plain language report of the surface conditions including braking action usually based on a mu-meter reading as below
mu 0.40 and above = Good
mu 0.39 - 0.36 = Medium/Good
mu 0.35 - 0.30 = Medium
mu 0.29 - 0.26 = Medium/Poor
mu 0.25 and below - Poor
I have heard pilots saying that if they are told that braking action is poor they have to use performance tables for icy runways but that the friction co-efficient marked on those tables is much lower than .25.
Mu-meters are unreliable in slush or wet snow so only plain language reports of runway conditions are passed to pilots.
Don't know whether that helps at all.