The
River Bourne or
The Bourne rises southwest of
Bisley in Bisley Common where it joins the longer
Trulley Brook which drains Colony Bog and the middle of the Pirbright Ranges, flows between
West End and
Bisley, skirts the south of
Chobham, makes a meander into
rural north Woking and joins the much longer Mill Bourne to the east of
Chobham before flowing between
Woodham and
Addlestone, then
New Haw and
Addlestone. Finally passing through some of the town, it enters
St George's College, Addlestone (formerly Woburn Park) where the River Bourne joins with the
River Bourne (Chertsey branch). The River Bourne then by a manmade channel turns east instead of running the final 100m into the Upper Chertsey Reach; joining the
River Thames below the southern weir of
Shepperton Lock and its many islands, which due to the
barraging of the Thames provides (as was possible before the Thames weirs were built) a greater fall. The brook runs north of
Chobham and through
Windlesham, providing the latter with its name. During this journey a few lakes are made, including Rapley Lake and just below a private lake with weir in royal
Bagshot Park.
The Mill Bourne, Chobham As soon as joined by Clappers Brook in west Chobham the Hale becomes the
Mill Bourne. It passes a recreation ground and Millbourne Bridge through the village centre picking up two main tributaries from the north (as the south is drained by The Bourne, see above), the only named one is Clappers Brook. In this straight the Mill Bourne passes Town Mill, the Chobham Museum, Sow Moor and Emmett's Mill before reaching a confluence with The Bourne. This confluence is between the
McLaren Technology Centre grounds and
Fairoaks Airport.
Knaphill and Parley Brooks Waterer's Park marks the start of an additional stream flowing north from
Knaphill, the northern suburb of
Woking forming a confluence west of Horsell Common. Just before the confluence is the confluence of the Parley Brook that stems from the
Goldsworth Park recreation ground. ==Flood Risk==