Braking Power vs. Friction Coefficient
I suspect the deceleration will break down into a number of performance phases.
The major division will be between wheels sliding over water and wheels with grip on pavement. Friction coefficients may not be constant in either case.
Antiskid effects once pavement grip was obtained requires elucidation.
There may be an intermediate phase where the rear axles were on pavement while some of the fronts were not. What kind of braking modulation between axles is available in that case and would the couple tend to lift the rear axle?
Superimposed over that will be reverse and spoiler effects -- a big question being just how much of either was applied in the cockpit and obtained from the machinery.