Indeed, in the highlands the sheer amount of rain tests the ground and clears the paths for water constantly. The only real danger is mudslides like that one at Gleann Cuaiche on the mainland some while back, which was discussed in an earlier thread.
There is an enormous pond to the west of the house which forms whenever there is sustained rain. It’s at its maximum possible extent now and is probably draining straight towards the patch where my neighbour is building his new house. But the water all carries on past me as there’s a very small rise on the east side if the house diverting water to the south before it heads away downhill. Unfortunately we have no ducks at the moment to enjoy the pond; I miss seeing them, but the fox was way too fond of them so I’m loath to risk it again much as I long for their perpetually cheerful company.