London catchment
• Hither Green • Greater London • ID: 4389TH • Level
(21m ago) • 4 readings/hr • 117 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
0.044 mASD
▬ Steady
24h Max
0.051 mASD
24h Min
0.040 mASD
Typical Range
0.03 - 1.00
mASD
Highest Recorded
1.08 mASD
EA official record
1.04 in our data (since Nov 2012)
Current level is 4% 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.
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.
1 storm overflow is traced upstream of this gauge, the nearest 14.6 km away along the river. 0 report discharging now, 1 reports not discharging.
Thames Water · into R.thames ( Tidal ) · 4.9 km away in a straight line · discharges to the sea, an estuary or tidal water
2 spills · 5 hours in 2025
Not discharging now · last
3 more within 6 km whose connection is not known.
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 Hither Green flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 18 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
0.61
mixed response
Avg Annual Rainfall
649 mm/yr
1991–2020 · +0% since 1941–70
Urban Extent
48%
heavily urbanised
Highest Daily Mean Flow
3.46 m³/s
30 Dec 2002 · 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 catchment is a mixture of urban and suburban development.
The station
A critical depth flume (width: 4m, wing wall height: 2m) in a concrete channel. Removed from peak flows dataset in February 2018 (WINFAP Files v6). Station closed.
How it measures flow
The flume was constructed in 1961 and calibrated theoretically - the low flow rating has since been revised on the basis of c/m gauging results; more gauging required to confirm the high flow rating). Modular range uncertain. One peak flow rating applied across period of record. Current rating derived by hydraulic modelling. Good fit to gaugings although none at high flows. More current meter readings needed from 0.4m to bankfull at 2m.
Flow regime
Very responsive regime.
The flow record
The structure was overwhelmed by the 1968 flood but sensibly full range otherwise. The September 1968 flood estimated at about 15 cumecs - bypassed the station, and exceeded the range of the recorder. Until June 1978, flows read from chart (rather than stage) - stages derived from rating applied, or GLC data where available.
Timing, not cause. Gauges can move together simply because the same rain fell on both.
Frequently asked questions
Is the River Quaggy at Manor House Gardens flooding today?
The current level is 0.04m, which is within the typical range of 0.03 to 1.00m. Flooding is unlikely at this level.
Is the river level rising or falling at Manor House Gardens?
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 Quaggy at Manor House Gardens?
The typical range at this station is 0.03m to 1.00m, based on Environment Agency historical data. Levels above 1.00m 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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