FloodRadar
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No property in an EA risk band
No property in AL7 2ND 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 AL7 or get the full picture below.
AL7 2ND gets about 630 mm of rain a year on average (wettest month October, 68 mm; driest March, 39 mm). That is 46% 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), 1.3 km away. Average rainfall: HadUK-Grid v1.3.2, Met Office. Contains public sector information licensed under the Open Government Licence v3.0.
The river map has no watercourse within 1 km of the centre of AL7 2ND.
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 5 recorded flood outlines mapped nearby; 66 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around AL7 2ND. 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 |
|---|---|---|
| Jul 1996 | 06JulySummer1996 | ~1.2 km |
| Jan 1992 | 06SeptemberAutumn1992 | ~9.2 km |
| Jan 1987 | 06JulySummer1987 | ~2.0 km |
| Jan 1978 | 06MaySpring1978 | ~2.5 km |
| Jan 1947 | 06MarchSpring1947 | ~1.9 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, 13 warnings nearby) ▶ replay it here · Henk (2024, 2 warnings nearby) ▶ replay it here · Dennis (2020, 2 warnings nearby) ▶ replay it here · Angus (2016, 1 warnings nearby) ▶ replay it here
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Panshanger | River Mimram | 2.0 km | 1.07 m | 1.28 m |
| Waterhall | River Lee | 4.6 km | 0.60 m | 1.16 m |
| Fulling Mill | River Mimram | 5.6 km | 0.66 m | 0.55 m |
| Hertford, Hartham Park | River Beane | 6.2 km | 0.80 m | 1.54 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 |
|---|---|---|---|---|
| Hatfield (mill Green) | Lee | 3.3 km | 6 (2025) | 58 |
| Essendon, Holywell Bridge | Lea | 3.3 km | 0 (2025) | 0 |
| West End, Essendon | Wood Hill Brook | 4.2 km | 0 (2025) | 0 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
No mapped flood-defence assets within 500 m of the postcode centre. 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.
Flooded here before? Log it and see what your floods had in common.
© 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 AL7 district.