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0.10

North Fareham weir

Wallington ⚙ Structure
East Hampshire catchment • Wallington • Hampshire • ID: E11301 • Level
(32m ago) • 4 readings/hr • 159 views

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Not an emergency service — if in danger call 999. Alerts rely on EA/SEPA/NRW data and are best-efforts. Terms

Current Level
0.103 mASD
▬ Steady
24h Max
0.107 mASD
24h Min
0.103 mASD
Typical Range
0.08 - 1.39
mASD
Highest Recorded
2.22 mASD
EA official record
1.91 in our data (since Aug 1981)
Current level is 5% of this
🚽 Sewage overflows nearby

Recent Water Levels

🌍 floodradar.co.uk
1 day

Flood predictions aren't generated for lock / structure gauges — their levels are driven by gate operation, not by catchment rainfall, so the forecast models would have no skill here.

Recent Readings

Falling · -0.2 cm over 5h
10 Oct 05:15 ▼ -0.1 cm 0.103 mASD
10 Oct 05:00 ▬ steady 0.104 mASD
10 Oct 04:45 ▬ steady 0.104 mASD
10 Oct 04:30 ▬ steady 0.104 mASD
10 Oct 04:15 ▬ steady 0.104 mASD
10 Oct 04:00 ▼ -0.1 cm 0.104 mASD
10 Oct 03:45 ▲ +0.1 cm 0.105 mASD
10 Oct 03:30 ▼ -0.1 cm 0.104 mASD
10 Oct 03:15 ▬ steady 0.105 mASD
10 Oct 03:00 ▬ steady 0.105 mASD
10 Oct 02:45 ▲ +0.1 cm 0.105 mASD
10 Oct 02:30 ▼ -0.1 cm 0.104 mASD
10 Oct 02:15 ▬ steady 0.105 mASD
10 Oct 02:00 ▬ steady 0.105 mASD
10 Oct 01:45 ▲ +0.1 cm 0.105 mASD
10 Oct 01:30 ▼ -0.1 cm 0.104 mASD
10 Oct 01:15 ▬ steady 0.105 mASD
10 Oct 01:00 ▲ +0.1 cm 0.105 mASD
10 Oct 00:45 ▼ -0.1 cm 0.104 mASD
10 Oct 00:30 0.105 mASD

Station Details

  • Monitoring Station: North Fareham weir
  • Watercourse: River Wallington
  • Nearest Town: Wallington
  • County: Hampshire
  • Coordinates: 50°51'49"N 1°9'59"W (50.863667, -1.166426)
  • Open in: Google Maps · Apple Maps (opens your maps app)
  • Date Opened: 1 Jan 1981
  • Status: Active
  • Station Type: River level station
Technical details: references, datum, range, flow archive
  • Station Reference: E11301
  • Also at this site: NORTH FAREHAM GS (E11302, flow, reporting)
  • RLOI id: 1044 (the EA's check-for-flooding station id)
  • EA Gauge ID: E11301-level-stage-i-15_min-mASD
  • Parameter: Level
  • Unit: mASD
  • Typical rise rate: 1 cm/hr (p95 sustained over 90 days)
  • Typical data delay: ~22 min (measured reading→publication lag)
  • Tidal: No
  • Lock / structure: ⚙ Yes — lock, weir, sluice or pump
  • Catchment Area: East Hampshire
  • Typical Range: 0.076 – 1.390 mASD
  • Drainage Area: 111 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: 0.10 mASD (EA at 10 Oct 05:15)
  • 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

Nearby

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.

2 storm overflows are traced upstream of this gauge, the nearest 5.5 km away along the river. 0 report discharging now, 2 report not discharging.

💧
Southwick WwTW🦪 Shellfish
Southern Water · into River Wallington · 5.5 km upstream along the river
9 spills · 93 hours in 2025
Not discharging now · last
💧
Southern Water · into River Wallington · 5.9 km upstream along the river
3 spills · 18 hours in 2025
Not discharging now · last

Nearby, connection not known

Within 6 km in a straight line, but the river map cannot say whether their water passes this gauge.

💧
Southern Water · into Fareham Creek/Portsmouth Hbr · 1.3 km away in a straight line · discharges to the sea, an estuary or tidal water
0 spills · 0 hours in 2025
Status unknown — the live feed has not updated for 144 d 17 h
💧
Southern Water · into Fareham Creek/Portsmouth Hbr · 1.4 km away in a straight line · discharges to the sea, an estuary or tidal water
0 spills · 0 hours in 2025
Not discharging now · last
💧
Southern Water · into Fareham Creek/Portsmouth Hbr · 1.7 km away in a straight line · discharges to the sea, an estuary or tidal water
5 spills · 28 hours in 2025
Not discharging now · last
💧
Southern Water · into Black Brook · 1.9 km away in a straight line · no mapped watercourse close enough to be sure
19 spills · 37 hours in 2025
Not discharging now · last
💧
Southern Water · into Trib Of Portsmouth Harbour · 1.9 km away in a straight line · discharges to the sea, an estuary or tidal water
14 spills · 19 hours in 2025
Not discharging now · last
💧
Southern Water · into Blackbrook Stream · 2.1 km away in a straight line · its watercourse is not on the river map
11 spills · 33 hours in 2025
Not discharging now · last
💧
Southern Water · into The Portsmouth Harbour · 2.4 km away in a straight line · discharges to the sea, an estuary or tidal water
1 spill · 0 hours in 2025
Not discharging now · last
💧
Southern Water · into Black Brook · 2.5 km away in a straight line · its watercourse is not on the river map
5 spills · 13 hours in 2025
Not discharging now · last

13 more within 6 km whose connection is not known.

3 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

This gauge rarely reaches its typical high of 1.39 m: 5 days since 2017. This year so far: 3 days.

2026 3 days so far
2025 1 day
2024 1 day
2023 0 days
2022 0 days
2021 0 days
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 2011 for the 23 flood areas linked to this gauge (nearest 0.6 km away).

1severe warning 51flood warnings 353flood alerts

Most recent flood warning: 18 Feb 2026 — Wickham on the River Meon

Year by year
YearSevereWarningsAlerts
2026 0 7 23
2025 0 0 13
2024 0 7 57
2023 0 1 27
2022 0 1 15
2021 0 3 8
2020 0 1 52
2019 0 2 24
2018 0 0 10
2017 0 0 4
2016 0 1 20
2015 0 0 4
2014 0 25 65
2013 0 2 18
2012 1 1 11
2011 0 0 2

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 Wallington flood history.

Flood areas linked to this gauge

Flood warnings and alerts are issued for whole areas. These are the 23 areas linked to this gauge, nearest first.

Show 15 more

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
0.64
mixed response
Avg Annual Rainfall
930 mm/yr
1991–2020 · +8% since 1941–70
Urban Extent
5.3%
partly urbanised
Median Annual Flood
18.02 m³/s
QMED — typical yearly peak flow
Highest Daily Mean Flow
18.60 m³/s
6 Nov 2000 · daily mean, not the instantaneous peak
Flow-Duration Curve
mean 0.6352.540.2610.0345% (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 32%Urban 13%
Grassland 37% → 41% since 1990

Flow affected by: 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 installed 1991, 250m upstream of the M27 river crossing. Flashy response but with appreciable baseflow.

More detail

The catchment

Permeable headwaters (Chalk) with impervious Eocene clays dominating below the headwaters. Upper Chalk with isolated patches of clay-with-flints covers northern half of catchment & a narrow belt on Southern boundary. Reading Beds (predominantly clays), London Clay, Bagshot Sand & Bracklesham Beds (sands & clays) occur between the two chalk outcrops, with alluvium dominating the valleys. On leaving the central basin the river cuts through the edge of the Portsdown Chalk ridge and flows over Tertiary clays into the sea. A largely rural catchment, but with an expanding developed area encompassing Waterlooville, Denmead & Purbrook in the headwaters.

The station

Flat-V weir (1:10 cross slope, 6 m wide) installed 1991, 250m upstream of the M27 river crossing. Replaced a compound critical depth flume with total crest width 4.8m, comprising central low flow channel and two side channels (0.39 m above central channel) which operated from 0.567 m3/s and was occasionally blocked by debris.

How it measures flow

Modular limit 1.0m, stage peaks truncated at ~20 cumecs; weir drowns. Numerous potential bypassing locations u/s of the gauge; bypassing occurs before water level reaches the top of wing walls. Upstream of the station floodplain is typically less than 150m wide and river meanders from one side to the other. Flooding exacerbated by Wallington Bridge 1km d/s of the weir, and spring tides can extend u/s of the bridge. Between the gauge and M27 crossing the river consists of a series of interconnected pools with mobile channel bed, considerable bank erosion and debris in the channel. A 3m section of bank u/s of the station has been stabilised with rock and concrete, the d/s bank has been stabilised with loose rock covered by fencing. Bridge across weir can make current meter measurement difficult in flood flows. Two peak flow ratings applied across period of record, the most recent is valid from November-1991. Current rating developed from hydraulic model and confirmed by gaugings.

Flow regime

Flashy response but with appreciable baseflow - zero flow in 1976 only. Groundwater catchment smaller than topographic catchment. In the upper catchment, runoff is negligible, except during wet winters when the bournes or lavants (seasonal streams) are running. Ground water abstraction causes a net diminution in runoff. Spray irrigation can significantly reduce summer flows. No direct surface water abstractions. Runoff from M27 motorway, 200m downstream of weir. Springs at Havant derive water from the Wallington area, therefore the Wallington is not typical of the area as a whole.

The flow record

Peak flow data only available from October 1976 onwards. Pre-1991, flows were truncated at ~10 cumecs (due to bypassing via the upstream eastern bank) and estimated using 42003. No data 20/07/91-03/12/91 due to station reconstruction. Full period of record peak flow data reviewed and released in October 2018 (WINFAP Files v7).

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
1951
Station datum
3.7 mAOD
Flow record
1951–2024 · 73 yrs · 99% complete
Peak-flow record
since 1951
Hydrometric area
42
Measured by
Environment Agency

Frequently asked questions

Is the River Wallington at North Fareham weir flooding today?

The current level is 0.10m, which is within the typical range of 0.08 to 1.39m. Flooding is unlikely at this level.

Is the river level rising or falling at North Fareham weir?

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.

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. 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 River Wallington at North Fareham weir?

The typical range at this station is 0.08m to 1.39m, based on Environment Agency historical data. Levels above 1.39m 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 →