Not in an at-risk area
SG4 8AD has no properties in any Environment Agency recorded flood-risk band. That is good news — but it is area-level and never proof a place cannot flood (surface-water and sewer flooding are assessed separately). See the at-risk postcodes in SG4 or get the full picture below.
The ground here sits at about 87 m above sea level and falls 46 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the west-south-west, 23.2 m higher.
Because 1 recorded flood nearby; 30 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around SG4 8AD. 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 | ~1.0 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.
2013-14 UK winter floods (2013, 5 warnings nearby) · Dennis (2020, 1 warnings nearby)
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Whitwell | River Mimram | 1.0 km | 0.50 m | 0.28 m |
| Fulling Mill | River Mimram | 5.0 km | 0.66 m | 0.55 m |
| Harpenden | River Lee | 6.9 km | 1.30 m | 1.69 m |
| Luton East Hyde | River Lee | 7.5 km | 1.70 m | 2.77 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 |
|---|---|---|---|---|
| Whitwell Wwtw | River Mimram | 0.2 km | 36 (2024) | 393 |
| N/a | N/a | 3.8 km | 25 (2024) | 86 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
9 mapped flood-defence assets within 500 m — nearest ~63 m (natural high ground, embankment). 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 SG4 8AD — all in the SG4 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 SG4 district.
