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Thornhurst Brook

A stream near Ewhurst Green, Surrey. No gauge of its own: what the river map and the banked data say about it.

Thornhurst Brook is a stream on Ordnance Survey’s river map near Ewhurst Green, Surrey, with about 4.8 km of mapped channel. On the map it flows into Cobbler's Brook; beyond that the map has a gap, so where it goes next is not known.

Next gauge downstream

Flash Bridge on Cobbler's Brook, about 3.4 km along the river below where Thornhurst Brook ends on the map.

1.01 mASD Normal · steady 30 min ago

No gauge measures Thornhurst Brook itself. A gauge downstream shows water that has already passed it, mixed with everything else that has joined on the way, so it says nothing exact about this stream.

Storm overflows on Thornhurst Brook

1 storm overflow is placed on this stream on the river map. Each status is the water company’s own monitor.

Canfold Wood Not discharging
Thames Water · into Thornhurst Brook · 2025: 13 spills, 82 h

A status says whether an overflow is discharging now, never how much or why. A monitor that is offline or has not reported is not “not discharging”. Sewage in Britain’s rivers →

Live status: © Thames Water storm overflow activity data, licensed under CC BY 4.0. Annual spill figures: Environment Agency Event Duration Monitoring return, © Environment Agency copyright and/or database right, Open Government Licence (OGL) v3.0.

Places along it

From its source towards its mouth, the settlements within a kilometre of it on the map: Ewhurst, Ewhurst Green.

Place names: OS Open Names. Contains OS data © Crown copyright and database rights 2026.

On the map

The map needs JavaScript. Everything it shows is listed on this page.

The blue line is Thornhurst Brook; grey lines are other mapped watercourses. Lines from OS Open Rivers (edition 2026-04).

GU6 8JW, a postcode page near where it ends on the map (about 980 m away) →All rivers with gauges →

What this page can and cannot tell you

Its line, its name and where it flows come from Ordnance Survey’s river map (OS Open Rivers, edition 2026-04), which leaves out many small streams, ditches and culverts. “Flows into” is the map’s word: a channel that is not on the map is not shown here, which does not mean it is not there.
No gauge measures Thornhurst Brook itself, so its own level is not known here.
Storm overflows are listed only where the river map places them on this stream; an overflow it could not place is not counted.
No water-sampling point with a banked sample is placed on this stream. Only England’s samples are banked, and only where the map can place their sampling point.
Nothing on this page says whether any place floods. For an address, see its postcode page.

This uses Environment Agency flood and river level data from the real-time data API (Beta). Licence: Open Government Licence v3.0.