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⤴Unusual rise — FloodRadar+Top 1% rise rate for this gauge.
Height for "Above a height"
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You'll be notified when this gauge is rising more than 0.10 m/hr — a sign of rapidly increasing water levels.
You'll be notified when a new storm-overflow (sewage) discharge starts within ~3 km of this gauge, based on the water companies' near-real-time feeds.
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Not an emergency service — if in danger call 999. Alerts rely on
EA/SEPA/NRW data and are best-efforts. Terms
Current Level
0.046 mASD
▬ Steady
24h Max
0.236 mASD
24h Min
0.046 mASD
Typical Range
0.05 - 1.80
mASD
Highest Recorded
2.56 mASD
EA official record
A 7.01 reading (17 Sep 2025) sits in our unverified raw history and is not treated as the record
Current level is 2% of this
🚽Sewage overflows nearby
Recent Water Levels
🌍 floodradar.co.uk
1 day
EA forecast (official)
Prediction V2
Prediction Eris
Nimbus beta
Experimental model fusing soil moisture, river flow, groundwater and catchment
character. The shaded band is its 10–90% range, widened so that about 80% of recent outcomes fall inside it.
Under evaluation — not yet promoted, so treat as a second opinion. The nearest rain gauge has sent no readings in the last day, so Nimbus has no recent measured rain to work from here.
River Flow
90 days
Daily mean discharge (m³/s) with the daily min–max band, from the EA Hydrology API. Flow is the volume of water passing the gauge — often a more direct flood signal than level.
Flow Data: Daily mean flow (m³/s) to 9 Oct (2 days behind — the EA publishes each day's mean a day or two after it ends; unchecked, provisional)via EA Hydrology
Storm overflows whose water reaches this gauge on the mapped river network, nearest first by distance along the river. The status is each water company's monitor: it says whether an overflow is discharging, not how much or what it contains.
11 storm overflows are traced upstream of this gauge, the nearest 2.0 km away along the river. 0 report discharging now, 8 report not discharging, and for 3 the monitor is offline or has not reported, so their status is not known.
Thames Water · into N/A · 3.3 km away in a straight line · no mapped watercourse close enough to be sure
4 spills · 14 hours in 2025
No live feed for this overflow
18 more within 6 km whose connection is not known.
3 other overflows within 6 km are downstream of this gauge or on another branch of the river network, so they are not listed.
These are the water companies' monitor statuses; a spill does not by itself explain a change in the gauge level. River connections and distances are traced on OS Open Rivers (edition 2026-04), which leaves out many small channels. Explore the sewage map →
Warnings apply to a whole flood area, not necessarily this exact spot. Years before 2006 aren't covered by the EA's historic record.
See also the Willesden flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 10 areas linked to this gauge, nearest first.
🌊 Urban & flashyHeavily built-up — rain runs off hard surfaces fast, so levels can spike within hours of heavy rain.
Your catchment is all the land that drains rainfall into the river above this gauge. Its character — how
steep, wet, wooded, urban or chalky that land is — decides how fast rain here turns into a rising river. A steep, bare or clay
catchment is “flashy” (rises and falls quickly, floods easily); a flat, chalk or well-wooded one is
slow and steady. The tiles below put numbers to that; the flow-duration curve reads left-to-right
from the river’s typical high flows (Q5) down to its low flows (Q95) — a steep curve means a flashy river.
The physical character of the land that drains to this gauge, and how it shapes its flood response — from the National River Flow Archive (UKCEH).
Baseflow Index
0.20
flashy — rain runs off fast
Avg Annual Rainfall
695 mm/yr
1991–2020 · +1% since 1941–70
Urban Extent
48%
heavily urbanised
Median Annual Flood
25.67 m³/s
QMED — typical yearly peak flow
Highest Daily Mean Flow
21.50 m³/s
8 May 1988 · daily mean, not the instantaneous peak
Flow-Duration Curve
Daily flow (m³/s) exceeded each % of the time — a steep curve is flashy, a flat one is steady. Q5 high · Q50 median · Q95 low.
The station is located in North-West London on the River Brent, below Wealdstone Brook confluence and the Brent Reservoir.
More detail
The catchment
A largely urban/suburban catchment in North-West London.
The station
Critical depth flume (rectangular) in a concrete channel, d/s of Brent Reservoir (informally called the Welsh Harp Reservoir).
How it measures flow
One rating applied across period of record. The weir is insensitive at low flows. There are discrepancies between the rating and low flow gaugings. However at stages higher than 0.25m the rating is much more reliable. Downstream debris screen (approx. 700m) can cause a backwater effect at the weir resulting in non-modular conditions and overestimation of flow. The extent of the effect is not fully known but has been witnessed during larger events. Screen is maintained by Environment Agency field team but not on a regular basis.
Flow regime
Responsive regime with very artificial low flow pattern. Welsh Harp reservoir is upstream. The Canal and River Trust can take a maximum of 1.7 Ml/d from the Welsh Harp reservoir to feed the Grand Union Canal. Run-off from the North Circular road enters the river approximately 1.5km upstream of the station.
The flow record
Peak flow data before water-year 1978/1979 has not been re-calculated using rating New1 as there is no stage data available. These events are calculated through the old rating. New rating gave minimal change to flow magnitude across the flow range so flows pre-1978 are still usable. Full period of record peak flow data reviewed and released in August 2024 (WINFAP Files v13).
Timing, not cause. Gauges can move together simply because the same rain fell on both.
Frequently asked questions
Is the River Brent at Brent, Monks Park flooding today?
The current level is 0.05m, which is below the typical range. Flooding is very unlikely at this level.
Is the river level rising or falling at Brent, Monks Park?
Based on the most recent readings, the level is currently steady. The chart above shows the last 12 hours of measurements by default (up to 7 days), updated roughly every 15 minutes.
What is a normal level for the River Brent at Brent, Monks Park?
The typical range at this station is 0.05m to 1.80m, based on Environment Agency historical data. Levels above 1.80m are higher than usually seen and may indicate a flood risk.
How often is this river level data updated?
Readings are supplied by the Environment Agency gauge. FloodRadar checks for updates roughly every 15 minutes; the timestamp above shows how recent the latest available reading is.
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📮 Flood risk by postcode near this gauge
Postcodes within 5 km with properties in the Environment Agency’s rivers-and-sea flood-risk bands:
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5 Jul 2023 Weir looking downstream from footbridge - high flows
30 Mar 2023 Weir looking downstream from footbridge - high flows
