Except for FAR 25 aircraft, wet runway does not have an impact on acceleration prior to V1. A contaminated runways does (e.g. standing water, more that 3 mm)
Summary of Falcon 20 Contamination Drag Results, 1996 to 1999. J.C.T. Martin. Transport Canada, Aircraft Certification, Ottawa, Ontario. PROCEEDINGS of the 2nd International Meeting on Aircraft Performance on Contaminated Runways
During takeoff on a contaminated runway, aircraft acceleration is reduced and takeoff distance is increased due to:
– displacement of contaminant
– impingement of contaminant on aircraft
Contamination drag is the sum of the displacement drag and the impingement drag.
Contamination drag is a function of Equivalent Water Depth (EWD). For the Falcon 20, DCONTAM is negligible below 0.1 inch EWD (approximately 3 mm). And then it rises and becomes an issue above 3mm.