A good finish to the upper Rhondda Fawr or the Rhondda Fach. Highlight is a series of semi-natural ledges under the railway bridge. Takeout river left just above Hopkinstown.
Putin somewhere convenient in Porth, or paddle down from the section above or the Rhondda Fawr. Takeout at the carpark just off the A4058 in Hopkinstown.
Rainchasers is best experienced as an app.