(3) Wet runway V1 reduced by 8kts, then for each 10kts headwind you can add 1kt back on to this. Calculation for Wet V1 taken from GWCs.
However, we take our V1/V2 from TOLD cards, but this Wet V1 will be used should there be a V1 split between the 2, the Wet V1 is normally limiting should we be reasonably heavy. Make sense? thought not
Basically if our T/O weight gives us a V1 of 120kts but the rwy is wet then this V1 is now 112kts, if we also have a 10kt headwind this V1 will be 113kts, we then check this against the TOLD cards for our weight, so if the TOLD card says a V1 of 116kts then the wet V1 is used as it's more limiting.
Bodjit, feel free to PM me should you need anything else.