Fun run. Watch out for a steep 1m weir about halfway down, and the hardest drop is a sticky slot near the end, just underneath a bridge off the A470 to the industrial estate.
Takeout at the outskirts of Brecon at the minor bridge just downstream of the A40 bridge. Putin at Old Glanrhyd: head upstream along the A470 from Brecon and take a minor road on the left immediately after the RH A4215 turn-off.
Rainchasers is best experienced as an app.