None of the storm overflows FloodRadar holds is traced upstream of this gauge on the mapped river network. That is not the same as none: the map leaves out many small streams and culverts, so an overflow it cannot place may still drain here, and not every company publishes every overflow. Those nearby are listed below.
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 Brockhampton Creek · 5.1 km away in a straight line · discharges to the sea, an estuary or tidal water
3 spills · 8 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 →
🌊 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
0.91
groundwater-fed — slow & steady
Avg Annual Rainfall
982 mm/yr
1991–2020 · +2% since 1941–70
Urban Extent
0.4%
largely rural
Median Annual Flood
2.28 m³/s
QMED — typical yearly peak flow
Highest Daily Mean Flow
5.08 m³/s
13 Dec 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.
Asymmetrical compound Crump weir gauging a river with baseflow-dominated regime. Significant net export of water from catchment, but also some flow augmentation.
More detail
The catchment
The Ems - which is ephemeral over much of its length - is a Chalk stream draining the South Downs; Drift cover is minimal. A rural catchment with significant woodland and scattered settlements. Geology principally chalk, therefore flow is predominantly from groundwater. Largely rural with significant woodland. No significant catchment changes known.
The station
Asymmetrical compound Crump profile weir; crests: 0.61m (showing effects of erosion) and 4.12m broad. Located 160m upstream of Hampshire Bridge.
How it measures flow
Structure limit 5.08 cumecs, modular throughout the flow range. Flows were above structure limit during 2000 event for long periods of time. All flows contained. Differential drawdown can affect river level measurement. One theoretical rating applied across period of record, but appears to overestimate flows.
Flow regime
Baseflow-dominated regime. Flood events are typically small, runoff normally approximately 1%. Significant net export of water from the catchment (groundwater abstractions) but low flows augmented by compensation water (from borehole).
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Gauging structure
Operating since
1967
Station datum
9.6 mAOD
Flow record
1967–2024 · 57 yrs · 100% complete
Peak-flow record
since 1967
Hydrometric area
41
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Frequently asked questions
Is WESTBOURNE GS flooding today?
The latest recorded level is 0.01m. Compare it with the recent history on the chart above to judge whether levels are unusually high.
Is the river level rising or falling at WESTBOURNE GS?
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.
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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Free live river-level widget — ideal for parish councils, angling clubs and local sites. Updates automatically.
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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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