An addition to the main Rawthey section, consists of a few weirs and one rapid of note near the end - railway falls(IV).
If you're not just running this as an add-on to the last section, then put on at Sedbergh New Bridge where there's a big lay-by and a path to the river. Best get-out is on the Lune, 500m below the confluence where there's a bridleway on river left.
Rainchasers is best experienced as an app.