Does S20 3AD flood?

Up to Medium likelihood

Properties in S20 3AD sit in the Environment Agency's Medium 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
High	greater than 3.3%	0
Medium	1% – 3.3%	2
Low	0.1% – 1%	2
Very low	below 0.1%	0

Over a 25-year mortgage, a property in a medium-likelihood area has a 22–57% chance of flooding at least once.

The ground around S20 3AD

The ground here sits at about 43 m above sea level and falls 21 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the south-west, 7.7 m higher.

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Get the full flood report for S20 3AD — £19 Free preview first · instant access · no account needed The detail below — flood history, warnings, rivers, overflows — is part of FloodRadar's property flood-risk report. The official band above is free; the preview shows more before you decide.

Inside the full report for S20 3AD

FloodRadarProperty Flood-Risk Report

S20 3AD

Moderate flood risk — investigate further

Because properties in the medium likelihood band; 4 recorded floods nearby; 172 official warnings since 2006.

D Today — indicative grade (A best → E)

··· By the 2050s — EA climate scenario (in the full report)

⚑ Official warning within 10 km: Yes ⚑ Recorded flood nearby: Yes ⚑ Flood defences within 500 m: Yes ⚑ In flood zone 2 or 3: ···

Rivers & sea

Up to Medium

Surface water

···

Groundwater

Not assessed

Historic flooding

Recorded nearby

Warning history · flood map with building picker · 2050s view · insurance outlook · every dataset receipt — 18 sections

Flood-risk map of this area

Environment Agency flood-likelihood cells

High (>3.3%/yr) Medium Low Very low Marker = postcode centre Base map © OpenStreetMap contributors

Rivers & sea likelihood · illustrative

Surface water (flash flooding) · illustrative

Flood Zones 2 & 3 (planning) · illustrative

2050s projection (climate) · illustrative

The map above shows the real EA rivers & sea likelihood cells around S20 3AD. 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.

Official flood warnings near S20 3AD

172

flood alerts & warnings within 10 km since 2010

of them full flood warnings or severe warnings

2026

most recent warning nearby (2026-08-27)

Warnings cover flood areas, not individual addresses.

Recorded floods near this postcode

Date	Recorded flood	Approx. distance
Oct 2023	October 2023 - Storm Babet - Recorded Flood Outline	~0.5 km
Jan 2021	2021 January Flood Incident - Storm Christoph	~59.8 km
Feb 2020	2020 February Flood Incident - Storm Dennis	~53.8 km
Nov 2019	2019 November Flood Incident	~26.1 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.

Named storms that brought flooding here

Babet (2023, 19 warnings nearby) · Dennis (2020, 8 warnings nearby) · Ciara (2020, 6 warnings nearby) · Henk (2024, 5 warnings nearby)

The rivers that matter for S20 3AD

Gauge	River	Distance	Typical high	Highest on record
Killamarsh	River Rother	0.1 km	1.68 m	4.36 m
Rother Valley Lake	Rother Washlands	0.5 km	1.32 m	1.32 m
Eckington Rotherham Road	The Moss	2.1 km	0.40 m	2.46 m
Woodhouse Mill Regulator	River Rother	4.5 km	2.00 m	5.82 m

Live levels, predictions and rain-response behaviour are on each gauge's page and in the property report.

Storm overflows within 5 km

Overflow	Discharges into	Distance	Spills	Hours
Sheffield Road Kilmarsh Cso	River Rother	0.5 km	19 (2024)	78
The Mill No 2 Cso	Trib Of Short Brook	1.2 km	29 (2024)	54
Norwood Sps	County Dyke To River Rother	1.7 km	18 (2024)	52
Eckington Cso	River Moss	1.8 km	20 (2024)	31

Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.

Flood defences

10 mapped flood-defence assets within 500 m — nearest ~20 m (natural high ground, embankment). Defences reduce risk, never remove it.

What the full property report adds

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.

Flood risk at nearby postcodes

S20 1AA up to Low S20 1AE up to High S20 1AG up to Low S20 1AH up to High S20 1DF up to Low S20 1ED up to Medium S20 1EE up to Medium S20 6TB up to High S20 7HE up to High S20 7HG up to High S20 7HN up to High S20 7HP up to High

At-risk postcodes near S20 3AD — all in the S20 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 S20 district.