Spate ditch in Hamsterley Forest. Mostly grade 2/3 but with one large fall (Blackling Hole) which can be run just as a park-and-huck in lower levels than needed for the rest of the beck.
Use the Forest Drive in Hamsterley after paying the £3 toll. Park at Blackling Hole and walk up as high as you can be bothered. Take out at the car park near the Grove or carry on down Bedburn Beck.
Rainchasers is best experienced as an app.