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0.48

Hythe End

Colne Brook
Colne (Lower) catchment • Hythe End • Windsor and Maidenhead • ID: 2894TH • Level
(38m ago) • 3 readings/hr • 188 views

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Current Level
0.483 mASD
▬ Steady
24h Max
0.490 mASD
24h Min
0.431 mASD
Typical Range
0.43 - 2.20
mASD
Highest Recorded
3.32 mASD
EA official record
A 5.90 reading (27 Feb 2025) sits in our unverified raw history and is not treated as the record
Current level is 15% of this
Current Flow
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🚽 Sewage overflows nearby

Recent Water Levels

🌍 floodradar.co.uk
1 day

Recent Readings

Rising · +0.6 cm over 5h
08 Oct 10:15 ▬ steady 0.483 mASD
08 Oct 10:00 ▼ -0.7 cm 0.483 mASD
08 Oct 09:30 ▲ +0.3 cm 0.490 mASD
08 Oct 09:15 ▲ +0.3 cm 0.487 mASD
08 Oct 09:00 ▼ -0.2 cm 0.484 mASD
08 Oct 08:45 ▲ +0.2 cm 0.486 mASD
08 Oct 08:30 ▼ -0.5 cm 0.484 mASD
08 Oct 08:15 ▲ +0.5 cm 0.489 mASD
08 Oct 08:00 ▼ -0.3 cm 0.484 mASD
08 Oct 07:45 ▲ +0.3 cm 0.487 mASD
08 Oct 07:30 ▲ +0.2 cm 0.484 mASD
08 Oct 07:15 ▲ +0.1 cm 0.482 mASD
08 Oct 07:00 ▬ steady 0.481 mASD
08 Oct 06:45 ▲ +0.1 cm 0.481 mASD
08 Oct 06:30 ▬ steady 0.480 mASD
08 Oct 06:15 ▲ +0.2 cm 0.480 mASD
08 Oct 06:00 ▬ steady 0.478 mASD
08 Oct 05:45 ▬ steady 0.478 mASD
08 Oct 05:30 ▲ +0.1 cm 0.478 mASD
08 Oct 05:15 0.477 mASD

Station Details

Technical details: references, datum, range, flow archive
  • Station Reference: 2894TH
  • RLOI id: 7208 (the EA's check-for-flooding station id)
  • EA Gauge ID: 2894TH-level-stage-i-15_min-mASD
  • Parameter: Level
  • Unit: mASD
  • Typical rise rate: 4 cm/hr (p95 sustained over 90 days)
  • Typical data delay: ~22 min (measured reading→publication lag)
  • Tidal: No
  • Lock / structure: No
  • Catchment Area: Colne (Lower)
  • Typical Range: 0.430 – 2.200 mASD
  • Drainage Area: 930 km² upstream of this gauge
  • 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
  • EA Cross-check: 0.48 mASD (EA at 8 Oct 10:15)
  • Flow Archive: National River Flow Archive ↗

Geographic coordinates may reflect the access point for the gauge, and not the precise location in the watercourse that it is taking readings from.

Nearby Stations

Gauges connected to this river, and others nearby. A distance “by river” follows the river on the map; any other is in a straight line.

Connected upstream

Connected downstream

Same river system, separate branch

Distances by river: OS Open Rivers. Contains OS data © Crown copyright and database rights 2026.

💧 Storm overflows upstream of this gauge

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.

6 storm overflows are traced upstream of this gauge, the nearest 11.3 km away along the river. 0 report discharging now, 6 report not discharging.

💧
Thames Water · into Colne Brook · 11.3 km upstream along the river
0 spills · 0 hours in 2025
Not discharging now · last
💧
Thames Water · into Misbourne · upstream (distance along the river not measured)
13 spills · 167 hours in 2025
Not discharging now · last
💧
Thames Water · into The River Chess · upstream (distance along the river not measured)
7 spills · 58 hours in 2025
Not discharging now · last
💧
Thames Water · into Misbourne · upstream (distance along the river not measured)
88 spills · 1,605 hours in 2025
Not discharging now · last
💧
Thames Water · into River Colne · upstream (distance along the river not measured)
35 spills · 455 hours in 2025
Not discharging now · last
💧
Thames Water · into Potters Bar Brook · upstream (distance along the river not measured)
9 spills · 25 hours in 2025
Not discharging now · last

2 other overflows within 6 km are downstream of this gauge or on another branch of the river network, so they are 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 →

Contains OS data © Crown copyright and database rights 2026.

Rainfall & Weather

Loading rainfall and weather data...

How often this river runs high

In a typical year this gauge reaches its typical high of 2.20 m on about 4 days. This year so far: 0 days.

2026 0 days so far
2025 10 days
2024 17 days
2023 0 days
2022 0 days
2021 8 days
2020 0 days
2019 2 days
2018 0 days
2017 0 days

Counted from each day's highest reading. Days with missing or implausible readings are left out.

Flood history near this gauge

Official Environment Agency warnings issued since 2009 for the 5 flood areas linked to this gauge (nearest 2.2 km away).

17flood warnings 122flood alerts

Most recent flood warning: 2 Mar 2024 — Colne Brook at Iver

Year by year
YearWarningsAlerts
2026 0 23
2025 0 8
2024 4 17
2023 2 10
2022 0 8
2021 3 6
2020 1 7
2019 2 6
2018 0 6
2017 0 1
2016 1 9
2015 0 2
2014 4 5
2013 0 6
2012 0 7
2009 0 1

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 Hythe End flood history.

Flood areas linked to this gauge

Flood warnings and alerts are issued for whole areas. These are the 5 areas linked to this gauge, nearest first.

Catchment Character

🌊 Mixed response A balance of quick runoff and slower groundwater baseflow.

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
0.60
mixed response
Avg Annual Rainfall
731 mm/yr
1991–2020 · +1% since 1941–70
Urban Extent
9.2%
partly urbanised
Highest Daily Mean Flow
11.90 m³/s
7 Feb 2014 · daily mean, not the instantaneous peak
Flow-Duration Curve
mean 2.125.091.680.5815% (high)% of days exceeded95% (low)
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 21%Grassland 43%Arable 11%Urban 20%Other 5%
Arable 16% → 11% since 1990

Flow affected by: effluent returns.

About this gauge

Gauging station located on a distributory of the River Colne.

More detail

The catchment

Mixed land use catchment.

The station

Electromagnetic gauging station (buried coil).

Descriptions from the National River Flow Archive (UKCEH). NRFA station record ↗

Gauge Details

How this gauging station is built and how long it has measured (NRFA / UKCEH).

Gauge type
Electromagnetic
Operating since
1991
Station datum
12.3 mAOD
Flow record
1991–2024 · 33 yrs · 99% complete
Hydrometric area
39
Measured by
Environment Agency

Frequently asked questions

Is the Colne Brook at Hythe End flooding today?

The current level is 0.48m, which is within the typical range of 0.43 to 2.20m. Flooding is unlikely at this level.

Is the river level rising or falling at Hythe End?

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 Colne Brook at Hythe End?

The typical range at this station is 0.43m to 2.20m, based on Environment Agency historical data. Levels above 2.20m 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:

Check any UK postcode’s flood risk →

🏠 Buying or renting around here? Get the Property Flood-Risk Report for any English postcode — official risk band, recorded floods, warning history, river behaviour and nearby storm overflows. £19 one-off. Learn more →