between Cowley and Yiewsley, Greater London. The Colne Brook splits off as a distributary between New Denham and Uxbridge. After this, at West Drayton, the Frays rejoins and the Wraysbury River, the second main anabranch, and Duke of Northumberland's River divide off. Soon after, at Longford, the intake is given to the Longford River, a artificial channel created in 1610 for King Charles I to supply the water features in Bushy Park and the rectangular lakes in Hampton Court Park. The Colne's drainage basin extends almost as far north again as its northern limit – the inflowing Gade, Ver and Misbourne extend well into the Chilterns. Opposite, the other of outer west and north-west London is drained by the Pymmes Brook, Brent, or Crane sub-basins of the Thames. In the north-west, centred on Tring's northern boundary the Chiltern ridge is most noticeable, a watershed of this basin and that of the River Great Ouse, north and east towards the Wash. Eponymous settlements and indirect reference within a district name The villages of Colney Heath east of St Albans, London Colney south of St Albans, Colney Street (almost wholly a large business park) north of Radlett and Colnbrook between Slough and Heathrow take their name from the river. Three Rivers District Council covers part of Hertfordshire and is named after the River Colne and its two tributary rivers, the River Chess and the River Gade. Use of valley and river for navigation Among early proposals to link the river to London was one in 1641 by Sir Edward Forde for a navigable canal, the main purpose of which seems to have been the supply of clean water, and two in 1766, for canals from Marylebone to the river at Uxbridge and another from Marylebone to West Drayton. The river underwent considerable change in the 1790s, when the Grand Junction Canal (which became part of the Grand Union Canal in 1929) was routed along the valley and still takes the river channel for part of its course. Construction began from Brentford, where it used for the channel of the River Brent, and progressed westwards then northwards, with it reaching Uxbridge in November 1794. To reach the Midlands it continued along the river channel until its junction with the River Gade, which it ran parallel to, but did not take over the channel. The Slough Arm was built in 1882 which required three