FloodRadar
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No property in an EA risk band
No property in PO18 9EF appears in the Environment Agency's rivers-and-sea flood-risk dataset. That dataset covers one of five flood sources. It is area-level, it covers rivers and the sea only, and it is never proof a place cannot flood — surface water, groundwater, sewers and reservoirs are assessed separately. See the at-risk postcodes in PO18 or get the full picture below.
PO18 9EF gets about 978 mm of rain a year on average (wettest month November, 116 mm; driest May, 54 mm). That is 16% drier than the UK as a whole, which averages 1,163 mm a year.
A thirty-year average for the surrounding area, not a measurement at this address and not a flood risk on its own: a dry area floods when a storm sits over it, and a wet one may drain away perfectly well. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 2.2 km away. Average rainfall: HadUK-Grid v1.3.2, Met Office. Contains public sector information licensed under the Open Government Licence v3.0.
The ground here sits at about 40 m above sea level and falls 68 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the north-north-east, 13.4 m higher.
The river map has no watercourse within 1 km of the centre of PO18 9EF.
That means this spot is not on the river map, not that there is no water here: Ordnance Survey’s river map (OS Open Rivers) leaves out small streams, ditches and culverts. Contains OS data © Crown copyright and database rights 2026.
Because 2 recorded flood outlines mapped nearby; 461 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around PO18 9EF. The small panels are illustrative previews of the report's per-layer map views — the full report draws each layer for real, plus recorded extents, defences and a building picker on an interactive map.
Warnings cover flood areas, not individual addresses.
| Date | Mapped flood extent | Approx. distance |
|---|---|---|
| Mar 2014 | East Hampshire Aerial Photography Winter 13/14 | ~5.1 km |
| Nov 1960 | CHICHESTER 1960 | ~1.8 km |
These are extents the Environment Agency has mapped, not a list of every flood. Records, not floods: no outline on the record is not evidence a place has not flooded. The full report tests whether any extent covered the exact spot.
2013-14 UK winter floods (2013, 73 warnings nearby) ▶ replay it here · Eleanor (2018, 6 warnings nearby) ▶ replay it here · Ciara (2020, 5 warnings nearby) ▶ replay it here · Eunice (2022, 5 warnings nearby) ▶ replay it here
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| WESTBOURNE GS | — | 4.8 km | — | — |
| Westbourne | River Ems | 4.8 km | 0.80 m | 1.04 m |
| Emsworth | West Brook | 6.3 km | 3.00 m | 3.25 m |
| Bosham Moreton Road | Bosham Stream | 6.8 km | 0.75 m | 1.00 m |
Live levels, predictions and rain-response behaviour are on each gauge's page and in the property report.
4 mapped flood-defence assets within 500 m — nearest ~35 m (natural high ground). Defences reduce risk, never remove it.
The interactive flood-risk map with a building picker (your exact house, not the postcode), the 2050s climate view, surface-water and planning flood zones at your building, exact recorded-flood distances, year-by-year warning charts, watercourses including culverted streams, an insurance outlook with the Flood Re rules, and a printable document with every dataset receipt — start with the free preview, unlock for £19.
At-risk postcodes near PO18 9EF — all in the PO18 district.
© Environment Agency copyright and/or database right 2025. All rights reserved. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, © NERC (CEH). © Crown Copyright and Database Rights 2025 OS AC0000807064. This product is produced in part from PAF® and Multiple Residence Data, the copyright in which is owned by Royal Mail Group Limited and/or Royal Mail Group plc. All rights reserved. Licence number AC0000807064. Recorded Flood Outlines and warning history © Environment Agency copyright and/or database right 2025. Storm-overflow figures: EA Event Duration Monitoring (England); live overflow status © the water companies, incl. Dŵr Cymru Welsh Water and Scottish Water. Flood defences © Environment Agency (OGL v3). This page summarises public area-level data — it is not a flood-risk survey and not a substitute for the official GOV.UK service. All data sources & licences. More postcodes: the PO18 district.