Lower Lee catchment
• Sewardstone • England • ID: 5339TH • Level
(36m ago) • 4 readings/hr • 110 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.
Get notified when recent rainfall near this gauge crosses its learnt rise trigger — an early "watch"
signal, typically hours before a rise. Experimental; not an official flood warning.
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EA/SEPA data and are best-efforts. Terms
Current Level
0.081 mASD
▼ Falling slightly
24h Max
0.103 mASD
24h Min
0.061 mASD
Typical Range
0.11 - 1.40
mASD
Highest Recorded
1.17 mASD
30 Oct 2000
Since Jan 1982
Current level is 7% 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
Rising · +2 cm over 6h
24 Aug 00:15▼ -0.2 cm0.081 mASD
24 Aug 00:00▼ -0.1 cm0.083 mASD
23 Aug 23:45▼ -0.1 cm0.084 mASD
23 Aug 23:30▼ -0.2 cm0.085 mASD
23 Aug 23:15▼ -0.2 cm0.087 mASD
23 Aug 23:00▼ -0.2 cm0.089 mASD
23 Aug 22:45▼ -0.9 cm0.091 mASD
23 Aug 21:30▼ -0.1 cm0.100 mASD
23 Aug 21:15▬ steady0.101 mASD
23 Aug 21:00▼ -0.1 cm0.102 mASD
23 Aug 20:45▲ +0.3 cm0.103 mASD
23 Aug 20:30▲ +0.3 cm0.100 mASD
23 Aug 20:15▲ +0.6 cm0.097 mASD
23 Aug 20:00▲ +1.0 cm0.091 mASD
23 Aug 19:45▲ +1 cm0.081 mASD
23 Aug 19:30▲ +0.6 cm0.070 mASD
23 Aug 19:15▲ +0.1 cm0.064 mASD
23 Aug 19:00▲ +0.2 cm0.063 mASD
23 Aug 18:45▬ steady0.061 mASD
23 Aug 18:300.061 mASD
Rainfall & Weather
Loading rainfall and weather data...
Flood history near this gauge
Official Environment Agency warnings issued since 2008 for the 11 flood
areas linked to this gauge (nearest 2.1 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 Sewardstone 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
0.48
mixed response
Avg Annual Rainfall
659 mm/yr
1991–2020 · +5% since 1941–70
Urban Extent
21%
heavily urbanised
Highest Recorded Flow
8.04 m³/s
30 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.
Station located in the lower reaches of the River Lee catchment.
More detail
The catchment
A predominantly impervious (clay), catchment with substantial superficial cover. Suburban in the valley, rural headwaters with considerable woodland.
The station
Flat V weir (1:10 cross-slope), 8m wide. Crest tapping does not operate effectively.
Flow regime
Responsive regime. Minor impact of artificial influences on flows, low discharges affected by gravel workings and pumped drainage from the M25 can be important.
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Flat-V weir
Operating since
1973
Station datum
15.3 mAOD
Flow record
1973–2024 · 51 yrs · 100% complete
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 Small River Lee at Enfield, Ordance Road flooding today?
The current level is 0.08m, which is below the typical range. Flooding is very unlikely at this level.
Is the river level rising or falling at Enfield, Ordance Road?
Based on the most recent readings, the level is currently falling slightly. The chart above shows the last 7 days of measurements, 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 1.4mm 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 Small River Lee at Enfield, Ordance Road?
The typical range at this station is 0.11m to 1.40m, based on Environment Agency historical data. Levels above 1.40m 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:
