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No official flood warning is active nearby and the closest river stations are within normal ranges.
Updated 2026-10-08 01:36:42 UTC · Official GOV.UK warnings · Flood preparation & help guide
Howletts Lane is monitored by 1 Environment Agency river level station on the Cannon Brook, in Greater London. Water levels are updated every 15 minutes.
Towns and villages near Howletts Lane with a page of their own: the homes in a flood risk area there, the nearest river gauges, and recorded floods.
New Denham · Harrow · Hayes · Chalfont St Peter · Bushey · Ealing
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 Cannon Brook, about 10 m from the middle of Howletts Lane's gauges. It flows into the River Pinn about 1.1 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 Cannon Brook nearest the middle of Howletts Lane'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.
Howletts Lane is monitored by 1 Environment Agency river level station on the Cannon Brook, in Greater London. Water levels are updated every 15 minutes, providing real-time flood monitoring for the area.
The Cannon Brook is monitored by 1 station (Howletts Lane, Ruislip). 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 Howletts Lane. When the EA issues a flood warning for any of these areas, it will appear on this page. These include: The River Pinn at Ruislip; The River Pinn and Woodridings Stream at Pinner, Eastcote, Ruislip, Ickenham, Uxbridge and Yiewsley; The River Pinn at Eastcote Village; The River Pinn at Ickenham.
There are 3 storm overflows within 5km of Howletts Lane. None of the 2 with a reporting monitor are currently discharging (1 has no live status right now). Enable "Sewage" on the map above to see their locations.
Each has its own page of live status and past discharges:
If flooding is forecast in Howletts Lane, 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.
Howletts Lane gets about 663 mm of rain a year on average (wettest month November, 74 mm; driest March, 41 mm). That is 43% 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), 1.2 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: Normal. No official flood warning is active nearby and the closest river stations are within normal ranges.
Howletts Lane has river level monitoring on Cannon 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 15 recorded flood extents around the town centre since 1703, most recently in 2024. 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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