So then is aviation in this country so-unregulated springs to mind as a descriptive phrase- that jet public transport pilots are dependant on grooves on runways to help slow them down in the wet or is it that, having had the runway resurfaced without or perhaps even with these handy grooves, new performance tables for the runway have not been produced by the CAA or the required agency? Was any such resurfacing the subject of a NOTAM?
Perhaps the grooves are instead to enable standing water to drain from the runway? But then, if there were standing water on the runway on the day in question, one would have expected such a degree of runway contamination to be included in the METAR/VOLMET or even a tower report? And if it were the case that standing water was a problem on the runway on the day, why was a braking coefficient test not carried out and ther esults included in any such METAR?