Arun and Western Streams catchment
• Lodsworth • West Sussex • ID: E10440 • Level
(1h ago) • 4 readings/hr • 188 views
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⤴Unusual rise — FloodRadar+Top 1% rise rate for this gauge.
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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.
Get notified when recent rainfall near this gauge crosses its learnt rise trigger — an early "watch"
signal, typically hours before a rise. Experimental; not an official flood warning.
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EA/SEPA/NRW data and are best-efforts. Terms
Current Level
0.030 mASD
▬ Steady
24h Max
0.031 mASD
24h Min
0.027 mASD
Typical Range
0.02 - 1.50
mASD
Highest Recorded
2.93 mASD
EA official record
2.38 in our data (since May 1981)
Current level is 1% of this
Current Flow
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🚽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 6 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.
1 storm overflow is traced upstream of this gauge, the nearest 12.7 km away along the river. 0 report discharging now, 1 reports not discharging.
Southern Water · into Tributary Of River Lod · 4.5 km away in a straight line · its watercourse is not on the river map
8 spills · 44 hours in 2025
Not discharging now · last
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 →
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 Lodsworth flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 5 areas linked to this gauge, nearest first.
🌊 Fairly flashyResponds fairly quickly to rain, with moderate baseflow between events.
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
0.48
mixed response
Avg Annual Rainfall
935 mm/yr
1991–2020 · +6% since 1941–70
Urban Extent
0.9%
largely rural
Median Annual Flood
16.76 m³/s
QMED — typical yearly peak flow
Highest Daily Mean Flow
22.71 m³/s
16 Feb 2020 · 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.
Land Cover (2023)
Woodland 43%Grassland 44%Arable 10%Urban 2%
Photos
Gauging-station photographs from the National River Flow Archive (UKCEH).
Crump profile weir. Primarily an impervious catchment. Minor flow regulation associated with upstream mill. Flashy response caused by steep clay topography in the upper catchment.
More detail
The catchment
The River Lod originates to the northwest of Fernhurst and flows southeast to the confluence with the River Rother east of Midhurst in Selham. Primarily an impervious catchment with Weald Clay more extensive than pervious Lower Greensand. A Greensand band exists just upstream of the station. The underlying geology comprises Hythe Beds composed of sandstones, siltstones & clays. Rural with considerable woodland. No significant catchment changes known.
The station
Crump profile weir (crest 7.05m broad).
How it measures flow
Crest tapping present (not currently used as area is very sandy and blocks easily but when in operation reduction factors of 0.8 assessed for high flows). Structure limit (from 1974 records) 1.95m / 41.49 cumecs. However, one or two floods have an appreciable crest tapping level, giving reduction factors of 0.8. All but highest flows modular. Footbridge just upstream of weir crest can control flow - effectively limits the free water surface at 1.95m. Some bypassing in exceptional floods. Good current meter record. Rating confirmed to 10 cumecs by gaugings but footbridge can control flows above ~40 cumecs. One peak flow rating applied across period of record. Developed using slope-area method for the lowest stage and ISIS modelling for the remaining flow range; confirmed to 14 m3s-1 with spot flow gaugings. Some bypassing in exceptional floods.
Flow regime
Very responsive regime caused by steep clay topography in the upper catchment. The more permeable components feed springs that provide the baseflow for the tributary headwaters. Flows are natural with a small net export of water due to groundwater abstraction. Minor flow regulation associated with upstream mill.
The flow record
Data estimated for Nov 2000 - Jan 2001. Full period of record peak flow data reviewed and released in October 2018 (WINFAP Files v7).
Timing, not cause. Gauges can move together simply because the same rain fell on both.
Frequently asked questions
Is the River Lod at Halfway Bridge flooding today?
The current level is 0.03m, which is within the typical range of 0.02 to 1.50m. Flooding is unlikely at this level.
Is the river level rising or falling at Halfway Bridge?
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 Lod at Halfway Bridge?
The typical range at this station is 0.02m to 1.50m, based on Environment Agency historical data. Levels above 1.50m 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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