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According to OPS regulations, the runway condition complying with the definition of a "wet runway" is…

  • A

    There is sufficient moisture on the runway surface to cause it to appear reflective, with significant areas of standing water.

  • B

    The runway surface is not dry, but the moisture on it does not give it a shiny appearance.

  • C

    Moisture is present on the runway, but it still has an “effectively dry” braking action.

  • D

    The runway is covered with 3 mm or less water with visible moisture.

EASA AIR OPS
Annex I to VIII

"Contaminated runway". A runway is considered to be contaminated when more than 25% of the runway surface area (whether in isolated areas or not) within the required length and width being used is covered by the following:

(a) surface water more than 3 mm (0.125 in) deep, or by slush, or loose snow, equivalent to more than 3 mm (0.125 in) of water;
(b) snow which has been compressed into a solid mass which resists further compression and will hold together or break into lumps if picked up (compacted snow); or
(c) ice, including wet ice.

"Damp runway". A runway is considered damp when the surface is not dry, but when the moisture on it does not give it a shiny appearance.

"Dry runway". A dry runway is one which is neither wet nor contaminated, and includes those paved runways which have been specially prepared with grooves or porous pavement and maintained to retain "effectively dry" braking action even when moisture is present.

"Wet runway." A runway is considered wet when the runway surface is covered with water, or equivalent, less than specified in subparagraph (a)(2) above or when there is sufficient moisture on the runway surface to cause it to appear reflective, but without significant areas of standing water.


ICAO Annex 14 Aerodromes
Chapter 1, 1-9

Wet runway: The runway surface is covered by any visible dampness or water up to and including 3 mm deep within the intended area of use.

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