Lower Lee catchment
• Edmonton • Greater London • ID: 5357TH • Level
(29m ago) • 4 readings/hr • 154 views
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⤴Unusual rise — FloodRadar+Top 1% rise rate for this gauge.
Height for "Above a height"
Drag the line on the chart, or type a value:mASD
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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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Current Level
0.068 mASD
▬ Steady
24h Max
0.118 mASD
24h Min
0.068 mASD
Typical Range
0.07 - 0.80
mASD
Highest Recorded
1.19 mASD
EA official record
A 1.71 reading (14 Feb 2020) sits in our unverified raw history and is not treated as the record
Current level is 6% 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.
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 6 Oct (2 days behind — the EA publishes each day's mean a day or two after it ends; unchecked, provisional)via EA Hydrology
None of the storm overflows FloodRadar holds is traced upstream of this gauge on the mapped river network. That is not the same as none: the map leaves out many small streams and culverts, so an overflow it cannot place may still drain here, and not every company publishes every overflow. Those nearby are listed below.
Nearby, connection not known
Within 6 km in a straight line, but the river map cannot say whether their water passes this gauge.
Thames Water · into Dagenham Brook · 6.0 km away in a straight line · its watercourse is not on the river map
5 spills · 31 hours in 2025
Not discharging now · last
1 other overflow within 6 km is downstream of this gauge or on another branch of the river network, so it is 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 Edmonton flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 8 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
0.26
flashy — rain runs off fast
Avg Annual Rainfall
680 mm/yr
1991–2020 · +4% since 1941–70
Urban Extent
29%
heavily urbanised
Highest Daily Mean Flow
5.35 m³/s
29 Oct 2000 · 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.
Land Cover (2023)
Woodland 9%Grassland 36%Arable 15%Urban 40%
Flow affected by: public water supply.
Photos
Gauging-station photographs from the National River Flow Archive (UKCEH).
The gauging station is located on Salmon Brook, a tributary that enters the lower River Lee system in North London.
More detail
The catchment
Impervious (London Clay) catchment. Salmon Brook rises on Enfield Chase and in the lower reaches the catchment is heavily urbanised.
The station
Flat V weir (1:10 cross-slope), 5m wide (insensitive at low flows) in a slightly trapezoidal section. It superseded a less effective (particularly at very low flows) compound broad-crested structure in 1980.
How it measures flow
Backing-up behind the d/s culvert can (rarely) result in drowning during flood conditions.
Flow regime
No significant abstractions or discharges are associated with Salmon Brook. Very similar minimum flows occurred during the 1964 and 1959 droughts.
Timing, not cause. Gauges can move together simply because the same rain fell on both.
Frequently asked questions
Is the Salmon Brook at Edmonton Green flooding today?
The current level is 0.07m, which is below the typical range. Flooding is very unlikely at this level.
Is the river level rising or falling at Edmonton Green?
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 Salmon Brook at Edmonton Green?
The typical range at this station is 0.07m to 0.80m, based on Environment Agency historical data. Levels above 0.80m 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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