Lower Lee catchment
• Edmonton • England • ID: 5369TH • Level
(21m ago) • 4 readings/hr • 125 views
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⤴Unusual rise — FloodRadar+Top 1% rise rate for this gauge.
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You'll be notified when this gauge is rising more than 0.10 mASD/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
0.037 mASD
▬ Steady
24h Max
0.037 mASD
24h Min
0.030 mASD
Typical Range
0.04 - 1.70
mASD
Highest Recorded
1.45 mASD
12 Oct 1993
Since Oct 1984
Current level is 3% of this
🚽Sewage overflows nearby
Recent Water Levels
🌍 floodradar.co.uk
1 day
Prediction V2
Prediction Eris
Nimbus beta
Experimental model fusing soil moisture, river flow, groundwater and catchment
character. Shown with its calibrated 10–90% confidence band. 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.
Long Term
🌍 floodradar.co.uk
—
Consecutive rainy days0 → 10+
Days Above Normal
This year vs 5-year monthly range
Recent Readings
Steady over 6h
24 Aug 00:30▬ steady0.037 mASD
24 Aug 00:15▬ steady0.037 mASD
24 Aug 00:00▬ steady0.037 mASD
23 Aug 23:45▬ steady0.037 mASD
23 Aug 23:30▬ steady0.037 mASD
23 Aug 23:15▬ steady0.037 mASD
23 Aug 23:00▬ steady0.037 mASD
23 Aug 22:45▬ steady0.037 mASD
23 Aug 21:30▬ steady0.037 mASD
23 Aug 21:15▬ steady0.037 mASD
23 Aug 21:00▬ steady0.037 mASD
23 Aug 20:45▬ steady0.037 mASD
23 Aug 20:30▬ steady0.037 mASD
23 Aug 20:15▬ steady0.037 mASD
23 Aug 20:00▬ steady0.037 mASD
23 Aug 19:45▬ steady0.037 mASD
23 Aug 19:30▬ steady0.037 mASD
23 Aug 19:15▬ steady0.037 mASD
23 Aug 19:00▬ steady0.037 mASD
23 Aug 18:450.037 mASD
Rainfall & Weather
Loading rainfall and weather data...
Flood history near this gauge
Official Environment Agency warnings issued since 2008 for the 10 flood
areas linked to this gauge (nearest 1.1 km away).
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.
Geographic coordinates may reflect the access point for the gauge, and not the precise location in the watercourse that it is taking readings from.
Catchment Character
🌊 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 Recorded Flow
9.80 m³/s
29 Oct 2000
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).
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Crump weir
Operating since
1972
Station datum
11.1 mAOD
Flow record
1954–2024 · 70 yrs · 100% complete
Peak-flow record
since 1954
Hydrometric area
38
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Possible storm-overflow correlation
🚽 Storm overflows on this river
Frequently asked questions
Is the Pymmes Brook at Edmonton, Silver Street flooding today?
The current level is 0.04m, 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 7 days of measurements, updated roughly every 15 minutes.
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 taken by the Environment Agency gauge roughly every 15 minutes and FloodRadar refreshes its data continuously, so the level shown is normally less than an hour old.
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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:
19 Aug 2009 Upstream view from gauging station
19 Aug 2009 Downstream view from gauging station
19 Aug 2009 Weir control
