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⤴Unusual rise — FloodRadar+Top 1% rise rate for this gauge.
Height for "Above a height"
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You'll be notified when this gauge is rising more than 0.10 m/hr — a sign of rapidly increasing water levels.
You'll be notified when a new storm-overflow (sewage) discharge starts within ~3 km of this gauge, based on the water companies' near-real-time feeds.
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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
0.266 mASD
▬ Steady
24h Max
0.267 mASD
24h Min
0.243 mASD
Typical Range
0.28 - 1.10
mASD
Highest Recorded
3.11 mASD
EA official record
3.03 in our data (since Feb 1981)
Current level is 9% of this
🚽Sewage overflows nearby
Recent Water Levels
🌍 floodradar.co.uk
1 day
EA forecast (official)
Prediction V2
Prediction Eris
Nimbus beta
Experimental model fusing soil moisture, river flow, groundwater and catchment
character. The shaded band is its 10–90% range, widened so that about 80% of recent outcomes fall inside it.
Under evaluation — not yet promoted, so treat as a second opinion.
River Flow
90 days
Daily mean discharge (m³/s) with the daily min–max band, from the EA Hydrology API. Flow is the volume of water passing the gauge — often a more direct flood signal than level.
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
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.
5 storm overflows are traced upstream of this gauge, the nearest 6.2 km away along the river. 0 report discharging now, 5 report not discharging.
Southern Water · into Freshwater River · 4.0 km away in a straight line · several watercourses close by, nothing to choose between them
3 spills · 12 hours in 2025
Not discharging now · last
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 →
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 Midhurst flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 4 areas linked to this gauge, nearest first.
🌊 Groundwater-fedSlow 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
0.68
groundwater-fed — slow & steady
Avg Annual Rainfall
995 mm/yr
1991–2020 · +6% since 1941–70
Urban Extent
2.9%
largely rural
Median Annual Flood
30.28 m³/s
QMED — typical yearly peak flow
Highest Daily Mean Flow
54.70 m³/s
6 Nov 2000 · daily mean, not the instantaneous peak
Flow-Duration Curve
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.
Compound Crump profile weir, bypassing occurs at the mill channel. Flow regime has a large groundwater component.
More detail
The catchment
Mixed geology; 2/3 pervious, 1/3 naturally impervious. Large tracts of Lower Greensand. A mainly rural catchment with some urban development. The river originates by Liss, flows southwest to Petersfield then east towards confluence with the River Arun. The main river is confined to the sandy measures of Lower Greensand which comprise almost 50% of catchment area giving rise to very fine silty and sandy alluvium. North of the Rother the area is mainly occupied by an outcrop of the Hythe Formation and to the south by an outcrop of the Folkestone Formation. Numerous fed springs originate at the Chalk and Gault Clay boundary, drain northwards into the Rother and cut across the Folkestone Formation. The catchment is predominantly rural with some urban development, mixed woodland & arable use.
The station
Compound Crump profile weir (crest widths 3.05m and 2 x 5.03m), central bay 0.3m lower. New ultrasonic gauge present downstream at Fittleworth to measure high flows. Prior to 1968 an existing penstock weir was in place, consisting of 5 irregularly shaped masonry piers & abutments, constructed in the late 18th century. The 6 wooden ratchet operated doors had fallen into disuse.
How it measures flow
Weir was originally designed to measure flows up to 51 cumecs, actual capacity when built 45 cumecs. Upstream approach not central, probably affecting uniformity of flows in weir section. Non-modular only during high flows (conveyance affected by growth of trees obstructing a downstream bridge; downstream siltation may also be a factor). Sept 2000 visit notes suggest flood flows during Dec 1999 had deposited up to 0.6m of sand on the right bank downstream of the structure, adding to effects of the bridge downstream causing drowning. Bankfull stage 1.9m above weir crest. One rating applied across period of record. Derived from hydraulic modelling, it fits well to the maximum gauging of 0.6m.
Flow regime
Many springs provide a large baseflow component but the Rother is very responsive to rainfall. Runoff influenced by groundwater abstraction/recharge. Petersfield forms a significant urban area. Abstractions for spray irrigation and sewage treatment works discharges affect the flow regime, particularly low flows - but limited impact overall. The Rother is influent above Iping Mill.
The flow record
1968 is largest high flow event on record, when the channel was overtopped a maximum level 0.7m above structure full was obtained; flow was estimated at 100-150 cumecs. Significantly greater than late 2000 maxima when all flows were contained with no overtopping or bypassing. Full period of record peak flow data reviewed and released in August 2021 (WINFAP Files v10).
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Gauging structure
Operating since
1967
Station datum
26.8 mAOD
Flow record
1966–2024 · 58 yrs · 100% complete
Peak-flow record
since 1966
Hydrometric area
41
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Possible storm-overflow correlation
Frequently asked questions
Is the River Rother at Iping Mill flooding today?
The current level is 0.27m, which is below the typical range. Flooding is very unlikely at this level.
Is the river level rising or falling at Iping Mill?
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 Rother at Iping Mill?
The typical range at this station is 0.28m to 1.10m, based on Environment Agency historical data. Levels above 1.10m 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:
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16 Oct 2020 View of channel downstream of the weir
17 Feb 2020 View of weir from left bank
28 Sep 2000 Left bank wall below weir
28 Sep 2000 Weir from downstream
28 Sep 2000 Upstream from weir
Weir and footbridge