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Conditions are worth watching: the Environment Agency has a Flood Alert in force for Tidal Thames riverside from Putney Bridge to Teddington Weir — flooding is possible from 02:15 AM to 04:15 AM on Saturday 10th October. Flooding is possible — be prepared and keep an eye on updates.
Updated 2026-10-09 17:12:06 UTC · Official GOV.UK warnings · Flood preparation & help guide
Green Street is monitored by 1 Environment Agency river level station on the Borehamwood Brook, in Hertfordshire. Water levels are updated every 15 minutes.
Towns and villages near Green Street with a page of their own: the homes in a flood risk area there, the nearest river gauges, and recorded floods.
Bushey · Potters Bar · Barnet
Place names: Contains OS data © Crown copyright and database rights 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Contains National Statistics data © Crown copyright and database right 2026. Licensed under the Open Government Licence v3.0.
The nearest watercourse on the river map is Borehamwood Brook, about 10 m from the middle of Green Street's gauges. It flows into Tykes Water about 1.0 km downstream.
A gauge downstream shows water that has already passed this point; one upstream sees it first. Distances along the river are from the point on Borehamwood Brook nearest the middle of Green Street's gauges. From Ordnance Survey’s river map (OS Open Rivers), which leaves out small streams, ditches and culverts, so a nearer one may exist. This describes where water goes on the map; it says nothing about flooding at any address. Contains OS data © Crown copyright and database rights 2026.
Green Street is monitored by 1 Environment Agency river level station on the Borehamwood Brook, in Hertfordshire. Water levels are updated every 15 minutes, providing real-time flood monitoring for the area.
The Borehamwood Brook is monitored by 1 station (Borehamwood). Each station records water levels continuously, with data synced to FloodRadar every 5 minutes.
There are 8 Environment Agency flood warning areas within 10km of Green Street. When the EA issues a flood warning for any of these areas, it will appear on this page. These include: The Radlett and Borehamwood Brooks at Borehamwood; The Radlett Brook at Radlett; The Upper River Colne and Radlett Brook at Colney Heath, London Colney, Borehamwood and Radlett; The Deans Brook at Edgware.
If flooding is forecast in Green Street, call Floodline on 0345 988 1188 for the latest information. Move valuables upstairs, turn off gas and electricity if safe to do so, and avoid walking or driving through flood water. Sign up for flood warnings on any station page above to receive email alerts when water levels rise. For emergency numbers, a preparation checklist and insurance guidance, see our flood help & preparation guide.
Green Street gets about 699 mm of rain a year on average (wettest month October, 78 mm; driest March, 42 mm). That is 40% drier than the UK as a whole, which averages 1,163 mm a year. See the rain gauges →
A thirty-year average for the area, not a forecast and not a flood risk on its own. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 1.1 km away. Average rainfall: HadUK-Grid v1.3.2, Met Office. Contains public sector information licensed under the Open Government Licence v3.0.
Floods whose mapped extent (EA Recorded Flood Outlines) reached within ~5 km of the town centre — most recent first. These are records of mapped extents, not a full list of floods. See them on the map →
Records, not floods: no outline on the record is not evidence a place has not flooded.
Current verdict: Watch. Conditions are worth watching: the Environment Agency has a Flood Alert in force for Tidal Thames riverside from Putney Bridge to Teddington Weir — flooding is possible from 02:15 AM to 04:15 AM on Saturday 10th October. Flooding is possible — be prepared and keep an eye on updates.
Green Street has river level monitoring on Borehamwood Brook — 1 monitoring station in total.
Use the GOV.UK Check for Flooding service (check-for-flooding.service.gov.uk) or call Floodline on 0345 988 1188 (24 hours). You can also set up free FloodRadar email or browser alerts from any station page above.
Follow official advice: move valuables and vehicles to safety, never walk or drive through flood water, turn off gas and electricity if safe, and check on vulnerable neighbours. See our flood preparation guide at floodradar.co.uk/flood-help.
Yes — the Environment Agency's Recorded Flood Outlines dataset shows 4 recorded flood extents around the town centre since 1703, most recently in 2013. That is a count of mapped extents, not of separate floods. Records, not floods: no outline on the record is not evidence a place has not flooded. See the flood history link below.
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