I am still interested in runway grooving; is runway 06 grooved? Is it a concrete surface, does it drain well?
The type of runway surface is not clearly defined in the photos, but if the lengthwise marks are bitumen in-fill between blocks, then water could easily accumulate between ridges.
A recent warming spell could have thawed out (expanded) the surface, raising the in-fill forming a dam, so that with heavy rain some significant accumulation could occur.
The ATC / crew problem is then to determine the difference between a wet runway and a significant depth of water (flooded) which significantly reduces braking performance.
As a thought, who would check and report on the runway surface? If this is usually done by CFR, in their absence who determines the surface condition?