FloodRadar
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Up to High likelihood
Properties in GU34 3HL sit in the Environment Agency's High flood-likelihood band (worst property). The band is the worst found in the postcode — it describes the land around properties (defence-adjusted, rivers & sea), not any single address, and not today's conditions.
| Likelihood band | Annual chance | Properties | Of which homes |
|---|---|---|---|
| High | greater than 3.3% | 6 | 2 |
| Medium | 1% – 3.3% | 1 | 0 |
| Low | 0.1% – 1% | 1 | 0 |
| Very low | below 0.1% | 0 | 0 |
Over a 25-year mortgage, a property in a high-likelihood area has at least a 57% chance of flooding at least once.
The ground here sits at about 108 m above sea level and falls 12 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the south-west, 1.8 m higher.
Because properties in the high likelihood band; 1 recorded flood nearby; 17 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around GU34 3HL. 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 | Recorded flood | Approx. distance |
|---|---|---|
| Jan 1947 | 06MarchSpring1947 | ~0.3 km |
EA Recorded Flood Outlines — absence of a record never proves a place has not flooded. The full report tests whether any extent covered the exact spot.
Dennis (2020, 1 warnings nearby) · 2013-14 UK winter floods (2013, 1 warnings nearby)
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Alton High Street | River Wey | 1.7 km | 0.37 m | 0.44 m |
| Kings Pond | River Wey | 1.8 km | 0.50 m | 0.56 m |
| Lower Farringdon | Groundwater Level | 3.3 km | 113.45 m | 118.23 m |
| Passfield Mill | River Wey | 10.8 km | 1.28 m | 1.71 m |
Live levels, predictions and rain-response behaviour are on each gauge's page and in the property report.
| Overflow | Discharges into | Distance | Spills | Hours |
|---|---|---|---|---|
| Newmans Lane | Wey | 2.2 km | 16 (2024) | 57 |
| Holybourne Sps | River Wey | 3.2 km | 19 (2024) | 289 |
| Huckers Lane | Oakhanger Stream | 4.5 km | 4 (2024) | 2 |
| Selborne Wastewater Treatment Works | Oakhanger Stream | 4.7 km | 119 (2024) | 2,365 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
8 mapped flood-defence assets within 500 m — nearest ~230 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 GU34 3HL — all in the GU34 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. 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 GU34 district.