Knighton (STW)
Storm overflow run by Hafren Dyfrdwy.
"Not discharging" means the company's monitor reports no discharge right now — not that the water is clean. The feed publishes status only; no discharge volume is measured.
Year by year
Hafren Dyfrdwy's annual Event Duration Monitoring return to Natural Resources Wales (12/24-hour spill count), as compiled by The Rivers Trust.
"No data" means the monitor was not working or not required to report that year — not zero.
Downstream of this overflow
The next gauge downstream that the river map places is Leintwardine (River Teme), 14.1 km along the river.
Water-sampling points downstream
The nearest Environment Agency sampling points the river map places below Leintwardine. Points between this overflow and that gauge cannot be put in order with it on the map, so they are not listed.
- Teme below Clun confluence
14 km along the river, below Leintwardine · Last sampled 15 Sep 2026 · 23 days ago - River Teme Oakley Park Bridge
30 km along the river · Last sampled 22 Sep 2026 · 16 days ago - River Teme at Dinham Bridge
35 km along the river · Last sampled 9 Dec 2025 · 10 months ago
A sample is dated: it is not the river now, and its results are on its own page. A sample taken after a discharge does not show that the discharge caused what was measured. Samples: Environment Agency Water Quality Archive, © Environment Agency and/or database right 2026, Open Government Licence v3.0.
A river gauge measures the level of the river; it does not measure this overflow's discharge, and a spill does not by itself explain a change there. This overflow was placed on the river by its position alone. Traced on OS Open Rivers (edition 2026-04), which leaves out many small channels.
Contains OS data © Crown copyright and database rights 2026.
Discharges we have recorded
26 discharge periods since 5 Jan 2025. 26 of them come from Hafren Dyfrdwy's own event-duration-monitoring records (published by the company, Jan 2025 – Dec 2025); this overflow has no live feed, so nothing after that log is held. The official annual count is the figure to quote.
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42 min
-
51 min
-
48 min
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19 min
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14 min
-
40 min
-
1 h 24 min
-
1 h 31 min
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1 d 12 h
-
1 h 56 min
Show 16 earlier
| Started | Ended | Discharge time |
|---|---|---|
| 20 min | ||
| 2 h 33 min | ||
| 50 min | ||
| 35 min | ||
| 53 min | ||
| 10 min | ||
| 2 h 33 min | ||
| 1 h 18 min | ||
| 27 min | ||
| 47 min | ||
| 2 h 35 min | ||
| 32 min | ||
| 1 h 1 min | ||
| 3 h 31 min | ||
| 5 h 22 min | ||
| 1 h 54 min |
The year figures above use the EA's 12/24-hour counting method, so they are comparable with the official figures; the monitor log's 29 raw blocks were merged into 26 continuous discharge periods (gaps under 15 min joined).
Rain nearby last 30 days
Nearest live rain gauge: Rhos Y Meirch Raingauge, 3.4 km away. Brown shading = when this overflow was discharging; ▼ = a discharge start.
Overflow shading is a timing match, not proof of cause — heavy rain and spills share a trigger. Times come from the water company’s event-duration monitor (site status only; no discharge volume is published).
Where it is
Concerned about this overflow?
Report pollution you can see or smell to the regulator straight away; the company handles complaints about the overflow itself.
Spill-event history: © Hafren Dyfrdwy, published on Stream (data.streamwaterdata.co.uk) under CC BY 4.0. Annual figures: The Rivers Trust EDM compilation, © Hafren Dyfrdwy, Open Government Licence. Times are shown in UK local time. FloodRadar republishes the monitor's status; it does not measure discharges itself.