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5.05

Havant

Hermitage Stream
East Hampshire catchment • Havant • Hampshire • ID: E11310 • Level
(39m ago) • 4 readings/hr • 176 views

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Current Level
5.051 mAOD
▬ Steady
24h Max
5.069 mAOD
24h Min
5.051 mAOD
Typical Range
5.03 - 6.20
mAOD
Highest Recorded
6.69 mAOD
EA official record
6.22 in our data (since Mar 2017)
🚽 Sewage overflows nearby

Recent Water Levels

🌍 floodradar.co.uk
1 day

Recent Readings

Steady over 5h
10 Sep 08:00 ▬ steady 5.051 mAOD
10 Sep 07:45 ▬ steady 5.051 mAOD
10 Sep 07:30 ▬ steady 5.051 mAOD
10 Sep 07:15 ▬ steady 5.051 mAOD
10 Sep 07:00 ▬ steady 5.051 mAOD
10 Sep 06:45 ▬ steady 5.051 mAOD
10 Sep 06:30 ▬ steady 5.051 mAOD
10 Sep 06:15 ▬ steady 5.051 mAOD
10 Sep 06:00 ▬ steady 5.051 mAOD
10 Sep 05:45 ▬ steady 5.051 mAOD
10 Sep 05:30 ▬ steady 5.051 mAOD
10 Sep 05:15 ▬ steady 5.051 mAOD
10 Sep 05:00 ▬ steady 5.051 mAOD
10 Sep 04:45 ▬ steady 5.051 mAOD
10 Sep 04:30 ▬ steady 5.051 mAOD
10 Sep 04:15 ▬ steady 5.051 mAOD
10 Sep 04:00 ▬ steady 5.051 mAOD
10 Sep 03:45 ▬ steady 5.052 mAOD
10 Sep 03:30 ▬ steady 5.052 mAOD
10 Sep 03:15 5.052 mAOD

Rainfall & Weather

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Flood history near this gauge

Official Environment Agency warnings issued since 2011 for the 35 flood areas linked to this gauge (nearest 0.7 km away).

68flood warnings 600flood alerts

Most recent flood warning: 18 Feb 2026 — Crosslands Drive and West Leigh, Havant, on the Lavant Stream

Year by year
YearWarningsAlerts
2026 5 41
2025 1 28
2024 9 78
2023 3 36
2022 8 29
2021 1 18
2020 4 63
2019 2 35
2018 0 28
2017 0 14
2016 0 33
2015 1 19
2014 25 97
2013 7 39
2012 2 40
2011 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 Havant flood history.

Nearby Stations

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Station Details

  • Monitoring Station: Havant
  • Watercourse: Hermitage Stream
  • Nearest Town: Havant
  • County: Hampshire
  • Coordinates: 50°51'22"N 0°59'30"W (50.856228, -0.991766)
  • Open in: Google Maps · Apple Maps (opens your maps app)
  • Date Opened: 27 Feb 1979
  • Status: Active
  • Station Type: River level station
  • Station Reference: E11310
  • EA Gauge ID: E11310-level-stage-i-15_min-mAOD
  • Parameter: Level
  • Unit: mAOD
  • Typical data delay: ~22 min (measured reading→publication lag)
  • Tidal: No
  • Lock / structure: No
  • Catchment Area: East Hampshire
  • Typical Range: 5.025 – 6.200 mAOD
  • Drainage Area: 17 km² upstream of this gauge
  • Flow Data: Daily mean flow (m³/s) to 8 Sep (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: 5.05 mAOD (EA at 10 Sep 07:45)
  • 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.

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
0.25
flashy — rain runs off fast
Avg Annual Rainfall
877 mm/yr
1991–2020 · +5% since 1941–70
Urban Extent
24%
heavily urbanised
Median Annual Flood
9.42 m³/s
QMED — typical yearly peak flow
Highest Daily Mean Flow
5.52 m³/s
27 Dec 1979 · daily mean, not the instantaneous peak
Flow-Duration Curve
mean 0.2500.9100.1230.0265% (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 22%Grassland 29%Arable 1%Urban 48%
Grassland 26% → 29% since 1990

Photos

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

11 Jun 2012 — High flows 11 Jun 2012 High flows 11 Jun 2012 — View downstream, high flow 11 Jun 2012 View downstream, high flow 11 Jun 2012 — High flows 11 Jun 2012 High flows 11 Jun 2012 — View upstream, high flow 11 Jun 2012 View upstream, high flow 25 Nov 2009 — Measuring section looking downstream 25 Nov 2009 Measuring section looking downstream 25 Nov 2009 — Channel upstream of gauging station 25 Nov 2009 Channel upstream of gauging station 25 Nov 2009 — Road bridge downstream of gauging station 25 Nov 2009 Road bridge downstream of gauging station 25 Nov 2009 — View of station and immediately upstream 25 Nov 2009 View of station and immediately upstream 25 Nov 2009 — Cross-section used for measurement 25 Nov 2009 Cross-section used for measurement 25 Nov 2009 — View upstream from left bank 25 Nov 2009 View upstream from left bank 25 Nov 2009 — Velocity-area trapezoidal section, looking downstream. Bend in river past road bridge not thought to affect hydrometric performance 25 Nov 2009 Velocity-area trapezoidal section, looking downstream. Bend in river past road bridge not thought to affect hydrometric performance 25 Nov 2009 — Velocity-area trapezoidal section, looking downstream. 25 Nov 2009 Velocity-area trapezoidal section, looking downstream. 15 Nov 2008 — View upstream 15 Nov 2008 View upstream 15 Nov 2008 — Measuring section 15 Nov 2008 Measuring section Downstream view to gauging station Downstream view to gauging station

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

About this gauge

Velocity area station in a concrete trapezoidal section within a formalised reach. Station gauges a mainly impervious catchment, typical hydrograph very flashy. Post-2003 complex water utilisation affects flows.

More detail

The catchment

A mainly impervious catchment, principally Reading Beds and London Clay. Intensive suburban development since the early 1960s, lower catchment now heavily urbanised.

The station

Velocity area station, 5.36m wide in a concrete trapezoidal section. Formalised reach with grass berms beneath a bridge; concrete block wall higher on outside of bend on right bank.

How it measures flow

Structure designed to measure up to 14 cumecs; all but exceptional flows contained and structure only exceeded a few times since installation. Bridge downstream may cause some backing up. Trolleys often thrown into stream here. Very sensitive at low flows, to extent where anomalous flow patterns occur (e.g. 2008); despite low flow anomalies, weed growth is not an issue at this station (very poor site ecologically). In 1951 a step was inserted into the flume throat to ensure modularity over the whole flow range, as the channel downstream was unlined. This was removed in 1956 and the structure became non-modular for low flows. One rating applied across period of record. Rating theoretically based but numerous current meter gaugings for this site.

Flow regime

Typical hydrograph very flashy; responsive regime. Natural to within 10% at Q95. Post-2003, some augmentation of high flows by runoff from the adjacent catchment of the Lavant Stream. Flow is diverted via a pipe into the Hermitage Stream, whenever the flow in the Lavant exceeds 0.28 cumecs. These inter-basin transfers also affect medium/low flows (e.g. 2006). Storage effect introduced to allow separation runoff from nearby Warren housing estate. Developers arranged 6 hour storage of natural stream runoff before its release into the Hermitage Stream (by which time the hydrograph is on the recession limb). Estate surface water drains allow unfettered discharge.

The flow record

Chart stage record extends back to 1953 providing peak flows pre-1979. June-August 2000 flows considered suspect. Station was possibly abandoned for a short duration around 1974. In winter of 1961, there existed a long period of high baseflow where the contribution from the Lavant catchment may have been greater. Full period of record peak flow data reviewed and released in September 2020 (WINFAP Files v9).

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
Velocity–area
Operating since
1976
Station datum
8.0 mAOD
Flow record
1979–2024 · 45 yrs · 87% complete
Peak-flow record
since 1953
Hydrometric area
42
Measured by
Environment Agency

Frequently asked questions

Is the Hermitage Stream at Havant flooding today?

The current level is 5.05m, which is within the typical range of 5.03 to 6.20m. Flooding is unlikely at this level.

Is the river level rising or falling at Havant?

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 Hermitage Stream at Havant?

The typical range at this station is 5.03m to 6.20m, based on Environment Agency historical data. Levels above 6.20m 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, recorded floods, warning history, river behaviour and nearby storm overflows. £19 one-off. Learn more →