JAR/EASA rules allow credit for reverse on 'wet' runways,as is stipulated in the Airbus manuals(02.04.10)along with the reduced V1 and the 15'screen height.
the lates FAA references to 'wet' ops are in AC92.I understand the only type
that has demonstrated the 'wet' performance(as opposed to annalysis)is the B777.
cheers
