Its head waters are a network of drainage ditches west of the A41 near Bushey that feed into Aldenham reservoir. The outlet of the reservoir then flows north into the lake in Haberdashers' Aske's School grounds known as Tykes Water Lake. It then proceeds north to make a confluence with a secondary stream, also called Tykes Water, near Kendal Hall Farm.
The combined Tykes Waters flow through the centre of Radlett parallel to the railway and then flow north to join the River Colne near Colney Street. The lower part is also called The Brook.
Source: Wikipedia.org
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