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Killamarsh, Derbyshire
Up to Very low likelihood
Properties in S21 1TE sit in the Environment Agency's Very low 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% | 0 | 0 |
| Medium | 1% – 3.3% | 0 | 0 |
| Low | 0.1% – 1% | 0 | 0 |
| Very low | below 0.1% | 1 | 1 |
Over a 25-year mortgage, a property in a very low-likelihood area has less than a 3% chance of flooding at least once.
The ground here sits at about 44 m above sea level and falls 29 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the west-south-west, 4.1 m higher.
Because properties in the very low likelihood band; 4 recorded floods nearby; 197 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around S21 1TE. 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 |
|---|---|---|
| Oct 2023 | October 2023 - Storm Babet - Recorded Flood Outline | ~0.3 km |
| Jan 2021 | 2021 January Flood Incident - Storm Christoph | ~60.0 km |
| Feb 2020 | 2020 February Flood Incident - Storm Dennis | ~54.0 km |
| Nov 2019 | 2019 November Flood Incident | ~26.3 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.
Babet (2023, 20 warnings nearby) · Dennis (2020, 9 warnings nearby) · Angus (2016, 6 warnings nearby) · Ciara (2020, 6 warnings nearby)
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Killamarsh | River Rother | 0.2 km | 1.68 m | 4.36 m |
| Rother Valley Lake | Rother Washlands | 0.6 km | 1.32 m | 1.32 m |
| Eckington Rotherham Road | The Moss | 2.0 km | 0.40 m | 2.46 m |
| Woodhouse Mill Regulator | River Rother | 4.8 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.
| Overflow | Discharges into | Distance | Spills | Hours |
|---|---|---|---|---|
| Sheffield Road Kilmarsh Cso | River Rother | 0.3 km | 19 (2024) | 78 |
| The Mill No 2 Cso | Trib Of Short Brook | 1.5 km | 29 (2024) | 54 |
| Norwood Sps | County Dyke To River Rother | 1.6 km | 18 (2024) | 52 |
| Eckington Cso | River Moss | 1.7 km | 20 (2024) | 31 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
11 mapped flood-defence assets within 500 m — nearest ~121 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 S21 1TE — all in the S21 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. Place names: Contains OS data © Crown copyright and database rights 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Contains National Statistics data © Crown copyright and database right 2026. Licensed under the Open Government Licence v3.0. 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 S21 district.