The Pipp Brook is a left-bank tributary of the River Mole, Surrey, England. It rises at two main springs north of Leith Hill on the Greensand Ridge, then descends steeply in a northward direction, before flowing eastwards along the Vale of Holmesdale. It runs to the north of DorkingHigh Street, before discharging into the Mole at Pixham. The Milton Brook, which rises at a tri-forked source lower than that of the Pipp Brook, is the principal tributary.
Course
Later Course
Both the Pipp Brook and the larger River Tillingbourne drain the northern slopes of Leith Hill and the watershed between the two rivers and much larger Wotton. The Pipp Brook runs almost due east along its Dorking stretch north of much of the town and south of the steep scarp of the North Downs at Ranmore Common before joining the Mole at Pixham. The area around the confluence is the subject of occasional riparian flooding as the rate of descent of the mole decreases significantly and at the Mole Gap becomes or became subterranean, depending on amount of sedimentation. The Pipp Brook itself has no sewage treatment works, few plains which it drains and as such an extremely narrow and low risk area of riparian flooding. These factors are instead present as to a few parcels of land of east Pixham sometimes considered Dorking by the national media based on a 2010s shorthand by the Environment Agency which has a 'Dorking Flood Area' comprising the sewage works, a handful of properties in Pixham and much of Brockham and Betchworth well upstream along the Mole to the east which are separated by more than a mile from Dorking and are narrowly in its post town.
Watermills
By the 19th century there were six corn/wheat grain mills on the river: Rookery Mill, Westcott Mill, Milton Court Mill, Parsonage Mill, Pipp Brook Mill and Pixham Mill, none of which functioned since the mid-20th century when bread production was widely commercialised and the product was transformed to decrease its rate of degrading.
