Do aircraft manufacturers assume damp runway is wet?

[AerocatS2A]

safetypee, your post doesn't mention damp runways at all, only wet grooved runways.

The AFM for that most modern of passenger jets, the BAe146, defines damp as being neither wet nor dry but as being equivalent to dry for performance purposes. A wet runway has enough water to appear reflective but no significant standing water.

As for grooves, not having seen any concrete information on how to treat a grooved runway, I'll take grooves as giving me better than expected braking performance on a wet runway, but I wouldn't use grooves to redefine a wet runway as dry.

For landing performance I'd consider a damp runway wet because I'm not able to assess it myself and I might not have the option of holding if the so called "damp" runway turns out to be wet.