Mark Davies was one of the eyewitnesses, as water cascaded over the wall of a car park after debris blocked a culvert.
More top news
Andrew Lauder, from Wenvoe, south Wales, has been branded a "serial groper".
The deal is welcome news for the site in Broughton which manufactures wings for the aircraft.
Fans queued for hours to get a glimpse of the Royal Couple as they tour Cardiff Castle and visit a community centre.