What is the designation for a runway that is 25% or more covered by moisture?

The designation for a runway that is 25% or more covered by moisture is termed a wet runway. In aviation terminology, a wet runway indicates conditions where there is enough moisture present to potentially affect the handling characteristics of an aircraft. This could include rain, snowmelt, or any other form of moisture that can create a film on the runway surface.

It is important for pilots and air traffic control to be aware of these designations because a wet runway can increase braking distances and affect takeoff and landing performance. It allows for proper assessment of runway conditions and necessary adjustments to operational procedures for safety reasons.

Other classifications, such as dry and contaminated runways, have specific definitions related to moisture levels and substance accumulation, but in this case, the significant presence of moisture marks the runway as 'wet.' Clear runway typically refers to the absence of any moisture or contaminants.