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0.08

Croxley Green

Gade
Colne (Upper) catchment • Croxley Green • Hertfordshire • ID: 2849TH • Level
(23m ago) • 4 readings/hr • 126 views

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Current Level
0.084 mASD
▬ Steady
24h Max
0.093 mASD
24h Min
0.060 mASD
Typical Range
0.07 - 1.30
mASD
Highest Recorded
0.40 mASD
12 Feb 2001
Since Sep 1985
Current level is 21% of this
🚽 Sewage overflows nearby

Recent Water Levels

🌍 floodradar.co.uk
1 day

Recent Readings

Rising · +1 cm over 6h
24 Aug 00:30 ▬ steady 0.084 mASD
24 Aug 00:15 ▬ steady 0.084 mASD
24 Aug 00:00 ▬ steady 0.084 mASD
23 Aug 23:45 ▬ steady 0.084 mASD
23 Aug 23:30 ▬ steady 0.084 mASD
23 Aug 23:15 ▬ steady 0.084 mASD
23 Aug 23:00 ▼ -0.1 cm 0.084 mASD
23 Aug 22:45 ▲ +0.2 cm 0.085 mASD
23 Aug 21:30 ▲ +0.1 cm 0.083 mASD
23 Aug 21:15 ▲ +0.1 cm 0.082 mASD
23 Aug 21:00 ▲ +0.1 cm 0.081 mASD
23 Aug 20:45 ▲ +0.1 cm 0.080 mASD
23 Aug 20:30 ▲ +0.1 cm 0.079 mASD
23 Aug 20:15 ▲ +0.1 cm 0.078 mASD
23 Aug 20:00 ▲ +0.1 cm 0.077 mASD
23 Aug 19:45 ▲ +0.1 cm 0.076 mASD
23 Aug 19:30 ▬ steady 0.075 mASD
23 Aug 19:15 ▲ +0.1 cm 0.075 mASD
23 Aug 19:00 ▬ steady 0.074 mASD
23 Aug 18:45 0.074 mASD

Rainfall & Weather

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Flood history near this gauge

Official Environment Agency warnings issued since 2014 for the 7 flood areas linked to this gauge (nearest 2.3 km away).

1flood warning 13flood alerts

Most recent flood warning: 7 Feb 2014River Gade at Kings Langley and Croxley

Year by year
YearWarningsAlerts
2024 0 5
2021 0 5
2020 0 1
2016 0 1
2014 1 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 Croxley Green flood history.

Nearby Stations

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Station Details

  • Monitoring Station: Croxley Green
  • Watercourse: River Gade
  • Nearest Town: Croxley Green
  • County: Hertfordshire
  • Coordinates: 51°38'44"N 0°26'13"W (51.645553, -0.436992)
  • Open in: Google Maps · Apple Maps (opens your maps app)
  • Date Opened: 1 Jan 1984
  • Status: Active
  • Station Type: River level station
  • Station Reference: 2849TH
  • EA Gauge ID: 2849TH-level-stage-i-15_min-mASD
  • Parameter: Level
  • Unit: mASD
  • Typical rise rate: 2 cm/hr (p95 sustained over 90 days)
  • Typical data delay: ~22 min (measured reading→publication lag)
  • Tidal: No
  • Lock / structure: No
  • Catchment Area: Colne (Upper)
  • Typical Range: 0.073 – 1.300 mASD
  • Drainage Area: 184 km² upstream of this gauge
  • Flow Data: Available (m³/s) via EA Hydrology
  • EA Cross-check: 0.08 mASD (EA at 24 Aug 00:15)
  • 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.

Catchment Character

🌊 Groundwater-fed Slow and steady — fed largely by groundwater, so levels change gradually, not in sudden spikes.

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
0.73
groundwater-fed — slow & steady
Avg Annual Rainfall
759 mm/yr
1991–2020 · +5% since 1941–70
Urban Extent
10%
partly urbanised
Highest Recorded Flow
4.53 m³/s
12 Feb 2001
Flow-Duration Curve
mean 0.9241.830.8440.3215% (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 14%Grassland 41%Arable 25%Urban 20%
Arable 32% → 25% since 1990

Flow affected by: groundwater abstraction, industrial / agricultural 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

The gauging station is located in the lower part of the River Gade catchment.

More detail

The catchment

Primarily a permeable (Chalk) draining the dip-slope of the Chilterns; appreciable Drift cover. Mixed land use: rural headwaters, considerable urban development below.

The station

Compound Crump-type weir (three sections, total breadth 10.1m); sharp bend immediately d/s. All flows are contained.

Flow regime

Baseflow dominated regime but with significant artificial influences evident, particularly at low flows. The net effect of abstractions and discharges is to make the runoff rather unrepresentative; overall a net export of water occurs.

The flow record

The negligible inflow from the Grand Union Canal via an overfall weir is no longer monitored.

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
Gauging structure
Operating since
1970
Station datum
49.7 mAOD
Flow record
1970–2024 · 54 yrs · 100% complete
Hydrometric area
39
Measured by
Environment Agency

Frequently asked questions

Is the River Gade at Croxley Green flooding today?

The current level is 0.08m, which is within the typical range of 0.07 to 1.30m. Flooding is unlikely at this level.

Is the river level rising or falling at Croxley Green?

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 River Gade at Croxley Green?

The typical range at this station is 0.07m to 1.30m, based on Environment Agency historical data. Levels above 1.30m 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:

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, floods since 1946, warning history, river behaviour and nearby storm overflows. £19 one-off. Learn more →