page_title: River Wandle
section_title: Makeup
hierarchical_section_title: River Wandle / Makeup
caption_attribution_description: English: This view shows the delta shortly after the removal of a half weir structure that had broken and which was giving rise to excessive siltation of the river Wandle
context_page_description: The River Wandle is a tributary of the River Thames in south London, England. With a total length of about 9 miles, the river passes through the London boroughs of Croydon, Sutton, Merton and Wandsworth, where it reaches the Thames. A short headwater – the Caterham Bourne – is in Surrey, the historic county of the river's catchment. Tributaries of the Wandle include the River Wrythe and the Norbury Brook.
  The name Wandle is thought to derive from a back-formation of Wandsworth.
  The Wandle Trail follows the course of the river from Croydon to Wandsworth.
context_section_description: The predominant geology of the south part is chalk interspersed with flint and narrow alluvial gravel beds in the south. London clay overlaid with patches of gravel topped by deeper humus forms the north; the top soil, tempered by the chalk beneath is less acidic where still seasonally turned in the south.
  The river has since the 18th century been largely terraformed with tributary artificial channels (becoming surface water drains) and runoff ditches. It has its relatively few underground (culverted) stretches; these are in Croydon.
caption: Tidal section of the Wandle, where it joins the River Thames
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