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Water Level Easing
Easing — down from 0.06 at 04:00, now 0.04
0.04

Bragbury Park

Stevenage Brook
Beane catchment • Bragbury End • Hertfordshire • ID: 4827TH • Level
(21m ago) • 4 readings/hr • 149 views

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Current Level
0.044 mASD
▼ Easing
24h Max
0.170 mASD
24h Min
0.042 mASD
Typical Range
0.05 - 0.80
mASD
Highest Recorded
1.19 mASD
EA official record
A 1.49 reading (19 Dec 2022) sits in our unverified raw history and is not treated as the record
Current level is 4% of this
🚽 Sewage overflows nearby

Recent Water Levels

🌍 floodradar.co.uk
1 day

Recent Readings

Falling · -0.6 cm over 5h
10 Oct 13:15 ▬ steady 0.044 mASD
10 Oct 13:00 ▬ steady 0.044 mASD
10 Oct 12:45 ▬ steady 0.044 mASD
10 Oct 12:30 ▬ steady 0.044 mASD
10 Oct 12:15 ▬ steady 0.044 mASD
10 Oct 12:00 ▼ -0.2 cm 0.044 mASD
10 Oct 11:45 ▲ +0.2 cm 0.046 mASD
10 Oct 11:30 ▼ -0.2 cm 0.044 mASD
10 Oct 11:15 ▬ steady 0.046 mASD
10 Oct 11:00 ▬ steady 0.046 mASD
10 Oct 10:45 ▬ steady 0.046 mASD
10 Oct 10:15 ▬ steady 0.046 mASD
10 Oct 10:00 ▬ steady 0.046 mASD
10 Oct 09:45 ▼ -0.2 cm 0.046 mASD
10 Oct 09:30 ▬ steady 0.048 mASD
10 Oct 09:15 ▬ steady 0.048 mASD
10 Oct 09:00 ▼ -0.2 cm 0.048 mASD
10 Oct 08:45 ▬ steady 0.050 mASD
10 Oct 08:30 ▬ steady 0.050 mASD
10 Oct 08:00 0.050 mASD

Station Details

Technical details: references, datum, range, flow archive
  • Station Reference: 4827TH
  • RLOI id: 7338 (the EA's check-for-flooding station id)
  • EA Gauge ID: 4827TH-level-stage-i-15_min-mASD
  • Parameter: Level
  • Unit: mASD
  • Typical rise rate: 18 cm/hr (p95 sustained over 90 days)
  • Typical data delay: ~22 min (measured reading→publication lag)
  • Tidal: No
  • Lock / structure: No
  • Catchment Area: Beane
  • Typical Range: 0.053 – 0.800 mASD
  • Drainage Area: 36 km² upstream of this gauge
  • Flow Data: Daily mean flow (m³/s) to 8 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: 0.04 mASD (EA at 10 Oct 12:45)
  • 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 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

None of the storm overflows FloodRadar holds is traced upstream of this gauge on the mapped river network. That is not the same as none: the map leaves out many small streams and culverts, so an overflow it cannot place may still drain here, and not every company publishes every overflow.

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

This gauge rarely reaches its typical high of 0.80 m: 2 days since 2017. This year so far: 0 days.

2026 0 days so far
2025 0 days
2024 0 days
2023 1 day
2022 0 days
2021 1 day
2020 0 days
2019 0 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 2010 for the 9 flood areas linked to this gauge (nearest 0.9 km away).

3flood warnings 18flood alerts

Most recent flood warning: 18 Jun 2021 — Stevenage Brook at Stevenage

Year by year
YearWarningsAlerts
2026 0 1
2025 0 1
2024 0 7
2023 0 2
2021 1 2
2017 0 1
2015 1 0
2014 1 2
2013 0 1
2010 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 Bragbury End flood history.

Flood areas linked to this gauge

Flood warnings and alerts are issued for whole areas. These are the 9 areas linked to this gauge, nearest first.

Show 1 more

Catchment Character

🌊 Urban & flashy Heavily 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
0.66
groundwater-fed — slow & steady
Avg Annual Rainfall
654 mm/yr
1991–2020 · +4% since 1941–70
Urban Extent
28%
heavily urbanised
Highest Daily Mean Flow
7.15 m³/s
25 Nov 2003 · daily mean, not the instantaneous peak
Flow-Duration Curve
mean 0.0930.3940.0310.0095% (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 7%Grassland 27%Arable 17%Urban 48%
Urban 43% → 48% since 1990

Flow affected by: surface-water abstraction, groundwater abstraction.

Photos

Gauging-station photographs from the National River Flow Archive (UKCEH).

Photos © NRFA / UKCEH & the measuring authority — shown at web resolution. Full gallery on the NRFA ↗

About this gauge

Flat V weir located on the Stevenage Brook, a tributary of the River Beane and sub-catchment of the River Lee in North London.

More detail

The catchment

A chalk catchment now largely urbanised.

The station

Flat V weir - 2.75m wide. It was constructed in 1974 to supersede the original broad-crested weir operated by Stevenage Development Corporation.

Flow regime

Gw abstractions significantly reduce runoff and the release of water from flood storage lagoons can influence the flashy flow regime.

The flow record

Flow records prior to 1974 are sporadic and of poor quality. The weir remains modular up to 4.1 cumecs. Higher magnitude floods uncorrected, including the notable November 2003 peak flow.

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
Flat-V weir
Operating since
1956
Station datum
71.4 mAOD
Flow record
1974–2024 · 50 yrs · 100% complete
Hydrometric area
38
Measured by
Environment Agency

Frequently asked questions

Is the Stevenage Brook at Bragbury Park 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 Bragbury Park?

Based on the most recent readings, the level is currently falling slightly. 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 7.5mm 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 Stevenage Brook at Bragbury Park?

The typical range at this station is 0.05m to 0.80m, based on Environment Agency historical data. Levels above 0.80m 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 →