River Bourne, Addlestone

The River Bourne is the name given to a Thames tributary in northwest Surrey, England which has a longer tributary, the Windle Brook, that rises nears Bagshot Park in the south of Swinley Forest, Berkshire, merging with it while flowing through villages north of Woking; downstream the Bourne joins the Thames near Weybridge.

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.

Waterer's Park[n 5] marks the start of an additional stream flowing north from Knaphill, the northern suburb of Woking forming a confluence west of Horsell Common.

Two months' rainfall fell in one night and local watercourses were unable to cope with the run off so flooded adjacent land, buildings and roads.

[8] The two main watercourses are once past Lightwater/Bisley 2.5–5 m wide flowing over land which is geologically the remains of the sandy Bagshot or Western Surrey formation, where sands and organic matter overlie clay, described as "slowly permeable loamy or peat soils" or "loamy and clayey soils with naturally high groundwater" surrounded by "free-draining naturally wet heath" on higher land, making in the uplands swathes unique, heather, gorse and coniferous habitat interspersed with bogs and brooks.

[9] At Chobham the widest plain of surrounding land forms which is, as drained by ditches and less acidic, fertile and widely used for cultivation.