A stream rises south of Tunbridge Wells and flows in a westerly direction, entering the Medway from the right bank downstream of the Waterdown Forest Brook. It powered two watermills. TQ 557 382  This forge was recorded as "Hughes Hale", it was owned by Lord Abergavenny in 1568, when it was leased for six years to James Ellis of Penshurst. The dam has been recorded at long and up to high. TQ 531 376  Groombridge Mill was working until c.1934, fed by the lake of Groombridge Place. The waterwheel was overshot, carried on a wooden axle square. This carries a cast iron pit wheel with 72 cogs, which drove the cast iron wallower with 30 teeth, carried on a wooden upright shaft. The great spur wheel is all wood, and has 84 cogs, driving three pairs of millstones. A wooden clasp arm crown wheel with 70 cogs drove two layshafts. The millstones were one pair of diameter French Burrs, one pair of Peaks and one pair of diameter Peaks.,    A stream rises above Cowden, and enters the Medway on its left bank below Ashurst Mill, it powered eight watermills. Scarletts Furnace was founded in 1547. It was known as Scalehurst in the fifteenth century, and at the end of the sixteenth century was being worked by one Quintyn. It came into the possession of John Knight of Lingfield. Scarletts Furnace was badly damaged in a storm in 1703 and had ceased working by 1717. The last reference to it being in 1764.The RH7 History Group  A mill here belonged to Richard Saxpes in 1516. It occupied the site later used for Scarletts Furnace. A corn mill was owned by the Knight family in 1768. It was working in 1932, but badly damaged in floods in 1937 and subsequently demolished. There was an oveshot waterwheel. A furnace was at work in 1556 and in 1574 it was being worked by Michael West of Lyme. At this time it was in the possession of the Titchbourne family. Robert Titchbourne being one of the 59 men who signed the death warrant of Charles I. The furnace was in ruins by 1664 and the site was later used for a corn mill. The Cowden Gun, a spoilt casting was dug up here. A corn mill was here in 1786, and closed down before the First World War.