Lower Lee catchment
• Edmonton • Greater London • ID: 5369TH • Level
(28m ago) • 4 readings/hr • 151 views
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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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Current Level
0.033 mASD
▬ Steady
24h Max
0.043 mASD
24h Min
0.031 mASD
Typical Range
0.04 - 1.70
mASD
Highest Recorded
1.45 mASD
12 Oct 1993
Since Oct 1984
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.
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 7 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.
2 storm overflows are traced upstream of this gauge, the nearest 6.2 km away along the river. 0 report discharging now, 2 report not discharging.
Thames Water · into Dagenham Brook · 5.0 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 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
0.24
flashy — rain runs off fast
Avg Annual Rainfall
704 mm/yr
1991–2020 · +5% since 1941–70
Urban Extent
58%
heavily urbanised
Median Annual Flood
19.45 m³/s
QMED — typical yearly peak flow
Highest Daily Mean Flow
9.80 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 5%Grassland 20%Arable 2%Urban 72%
Photos
Gauging-station photographs from the National River Flow Archive (UKCEH).
Station located on the Pymmes Brook with a catchment dominated by urban land use.
More detail
The catchment
Impervious (London Clay) catchment. Pymmes Brook rises on Enfield Chase but the catchment is now dominated by urban land use.
The station
Crump weir (crest width 6.16m) in a concrete trapezoidal channel. Installed in 1972 a few metres upstream of the original station (Alcazaar 38025). The original station was commissioned in 1954 and operated as a rated section.
How it measures flow
Theoretical crump weir formula used to calculate flows since the weir was built. Crest tapping and tail levels suggest the weir remains modular throughout the flow range. Station performs well at low flows but too few gaugings at mid to high flows to confirm levels of uncertainty.
Flow regime
Pre-1965 runoff substantially enhanced by sewage effluent (now treated outside the catchment). Currently no significant abstractions or discharges. Natural to within 10% at Q95.
The flow record
Original rating superseded in 1963 by a new discharge table and the old records were corrected. This was replaced in 1981 by one which took into account the trapezoidal nature of the channel. Data from November 1972 to 1981 was recalculated and the new rating was adopted since 1982. Flows corrected for weir drowning since 1982. Full period of record peak flow data reviewed and released in September 2019 (WINFAP Files v8).
Timing, not cause. Gauges can move together simply because the same rain fell on both.
Frequently asked questions
Is the Pymmes Brook at Edmonton, Silver Street flooding today?
The current level is 0.03m, which is below the typical range. Flooding is very unlikely at this level.
Is the river level rising or falling at Edmonton, Silver Street?
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.
Why is the level slowly falling?
When little or no rain has fallen for a while, a river level gradually drops as the water stored in the ground and soil drains away with nothing to replace it. This is called baseflow recession and is normal in dry spells. Only about 6.8mm of rain has fallen nearby in the last 7 days, so the flow is being sustained mainly by groundwater. A gentle decline like this is expected and is not a sign of a problem — downstream gauges often recede a little faster than headwaters further upstream, and levels recover once rain returns.
What is a normal level for the Pymmes Brook at Edmonton, Silver Street?
The typical range at this station is 0.04m to 1.70m, based on Environment Agency historical data. Levels above 1.70m 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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19 Aug 2009 Upstream view from gauging station
19 Aug 2009 Downstream view from gauging station
19 Aug 2009 Weir control
