Requires a 2-3km walkin. First km is easier gd3, then run builds to continuous gd4. At the takeout bridge just before the confluence with the Llafar is a gd5 drop. It is possible to continue downriver from here but it can be a little sketchy.
Find the small road bridge above Gerlan in Bethesda, this is the takeout. By back-tracking downhill and then taking the first right, follow a small road to the start of the walkin (follow the footpath upstream!).
Rainchasers is best experienced as an app.