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0.09

Wilton

Nadder
Hampshire Avon catchment • Wilton • Wiltshire • ID: 43109 • Level
(23m ago) • 4 readings/hr • 195 views

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Current Level
0.094 m
▬ Steady
24h Max
0.102 m
24h Min
0.094 m
Typical Range
0.09 - 0.57
m
Highest Recorded
1.19 m
EA official record
A 1.35 reading (9 Feb 2014) sits in our unverified raw history and is not treated as the record
Current level is 8% of this
🚽 Sewage overflows nearby

Recent Water Levels

🌍 floodradar.co.uk
1 day

Recent Readings

Falling · -0.2 cm over 5h
08 Oct 21:00 ▬ steady 0.094 m
08 Oct 20:45 ▬ steady 0.094 m
08 Oct 20:30 ▬ steady 0.094 m
08 Oct 20:15 ▼ -0.1 cm 0.094 m
08 Oct 20:00 ▬ steady 0.095 m
08 Oct 19:45 ▬ steady 0.095 m
08 Oct 19:30 ▬ steady 0.095 m
08 Oct 19:15 ▬ steady 0.095 m
08 Oct 19:00 ▬ steady 0.095 m
08 Oct 18:45 ▬ steady 0.095 m
08 Oct 18:30 ▬ steady 0.095 m
08 Oct 18:15 ▬ steady 0.095 m
08 Oct 18:00 ▬ steady 0.095 m
08 Oct 17:45 ▬ steady 0.095 m
08 Oct 17:30 ▬ steady 0.095 m
08 Oct 17:00 ▼ -0.1 cm 0.095 m
08 Oct 16:45 ▬ steady 0.096 m
08 Oct 16:30 ▬ steady 0.096 m
08 Oct 16:15 ▬ steady 0.096 m
08 Oct 16:00 0.096 m

Station Details

  • Monitoring Station: Wilton
  • Watercourse: River Nadder
  • Nearest Town: Wilton
  • County: Wiltshire
  • Coordinates: 51°4'35"N 1°51'45"W (51.076368, -1.862567)
  • Open in: Google Maps · Apple Maps (opens your maps app)
  • Date Opened: 1 Jan 1996
  • Status: Active
  • Station Type: River level station
Technical details: references, datum, range, flow archive
  • Station Reference: 43109
  • RLOI id: 3329 (the EA's check-for-flooding station id)
  • EA Gauge ID: 43109-level-stage-i-15_min-m
  • Parameter: Level
  • Unit: m
  • Typical rise rate: 0 cm/hr (p95 sustained over 90 days)
  • Typical data delay: ~22 min (measured reading→publication lag)
  • Tidal: No
  • Lock / structure: No
  • Catchment Area: Hampshire Avon
  • Typical Range: 0.085 – 0.570 m
  • Drainage Area: 221 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: 0.09 m (EA at 8 Oct 20:45)
  • 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 upstream

Connected downstream

Same river system, separate branch

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.

4 storm overflows are traced upstream of this gauge, the nearest 5.2 km away along the river. 0 report discharging now, 4 report not discharging.

💧
Wessex Water · into River Nadder · 5.2 km upstream along the river
81 spills · 1,551 hours in 2025
Not discharging now · last
💧
Wessex Water · into River Nadder · 5.6 km upstream along the river
4 spills · 42 hours in 2025
Not discharging now · last
💧
Wessex Water · into Fovant Brook · 14.5 km upstream along the river
81 spills · 1,252 hours in 2025
Not discharging now · last
💧
Wessex Water · into River Nadder Via Sws · 22.3 km upstream along the river
36 spills · 71 hours in 2025
Not discharging now · last
Reaches the river through a sewer, so where it enters is approximate.

5 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 0.57 m on about 2 days. This year so far: 9 days.

2026 9 days so far
2025 4 days
2024 9 days
2023 3 days
2022 0 days patchy data
2021 2 days
2020 1 day
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, so a year marked patchy may have run high more often than shown.

Flood history near this gauge

Official Environment Agency warnings issued since 2011 for the 9 flood areas linked to this gauge (nearest 0.3 km away).

7flood warnings 105flood alerts

Most recent flood warning: 10 Feb 2026 — Lower Wylye at Wilton Town

Year by year
YearWarningsAlerts
2026 3 4
2025 1 11
2024 2 21
2023 0 12
2022 0 2
2021 0 2
2020 0 9
2019 0 5
2018 0 4
2017 0 1
2016 0 6
2014 0 10
2013 0 5
2012 1 12
2011 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 Wilton 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

🌊 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
0.76
groundwater-fed — slow & steady
Avg Annual Rainfall
952 mm/yr
1991–2020 · +1% since 1941–70
Urban Extent
0.9%
largely rural
Median Annual Flood
15.86 m³/s
QMED — typical yearly peak flow
Highest Daily Mean Flow
27.73 m³/s
28 Dec 1979 · daily mean, not the instantaneous peak
Flow-Duration Curve
mean 2.937.612.140.8995% (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 15%Grassland 41%Arable 41%Urban 3%

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

Crump weir on the River Nadder.

More detail

The catchment

Mixed geological formation (Jurassic and Cretaceous) - predominantly Chalk with Clays in upper catchment. Land use is rural. No major catchment changes.

The station

Crump weir, crest 18.3m wide.

How it measures flow

Crest tapping abandoned after first few months; modular limit (0.6m) seldom reached, although weir can drown at very high flows. Bypassing is minor. Banks very weedy during summer. Rare weed clearance can lead to significant u/s constriction. Minor bypass. Gaugings taken 50-100m upstream, previously taken at Bull Bridge. Single theoretical rating has been confirmed by spot gaugings at high and low flows. Rating may underestimate in mid flow range. Upper limit of rating is 0.48m/12.8cumecs. It is extrapolated beyond that limit.

Flow regime

Natural to within 10% at Q95; some minor groundwater pumping. Sluices and hatches can regulate flow for short periods. A small drainage channel bypasses the recorder.

The flow record

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
Crump weir
Operating since
1966
Station datum
51.1 mAOD
Flow record
1966–2024 · 58 yrs · 100% complete
Peak-flow record
since 1966
Hydrometric area
43
Measured by
Environment Agency

Frequently asked questions

Is the River Nadder at Wilton flooding today?

The current level is 0.09m, which is within the typical range of 0.09 to 0.57m. Flooding is unlikely at this level.

Is the river level rising or falling at Wilton?

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 River Nadder at Wilton?

The typical range at this station is 0.09m to 0.57m, based on Environment Agency historical data. Levels above 0.57m 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 →