← Chagford Main STW
Spill evidence · Friends of the River Teign
Chagford Main STW
Storm overflow at the works · SBB00227 · feeds CHAGFORD MAIN_STW_CHAGFORD
Dry spill
Evidence strength
Low confidence- ✓ Dry on the EA 1-day window
- ✓ Monitor 100% operational that year
- ⚠ Short discharge (<1 h) — weaker signal
The discharge
- Spill day
- Saturday, 13 December 2025
- Started
- 13 Dec 2025, 22:35
- Ended
- 13 Dec 2025, 23:25
- Duration
- 49 minutes 50 seconds
- Receiving water
- Teign (Upper)
- Parish
- Chagford
Rainfall evidence
Daily rainfall at the matched gauge (Mardon Down) for the spill day and the days before. A spill is dry when every day in the window is ≤ 0.25 mm.
1-day window: Dry spill3-day window: Wet weather4-day window: Wet weather
| Date | Rainfall | |
|---|---|---|
| 13/12/2025 (spill day) | 0 mm | dry |
| 12/12/2025 | 0 mm | dry |
| 11/12/2025 | 9.8 mm | rain |
| 10/12/2025 | 0 mm | dry |
| 09/12/2025 | 15.8 mm | rain |
River flow that day: 13.976 m³/s. Verify at the EA rainfall station.
Gauge proximity
Outlet (red) vs matched rain gauge (blue), 7.2 km apart. Closer means the rainfall reading is more representative of the overflow.
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Severity & context
- Bathing water
- Not Applicable
- Shellfish water
- Not Applicable
- EA annual return (2025)
- 40 counted spills · 336 h total
- Monitor uptime (2025)
- 100% operational
Method & provenance. Dry/wet classification is decided by rainfall at the nearest EA gauge — ≤ 0.25 mm on the spill day and each preceding day of the window (how we classify). Spill data: Environment Agency EDM (outlet SBB00227). Rainfall: EA Hydrology gauge 323b21d8-c9a4-4681-bc5c-62d7337993ac. A dry spill is precautionary evidence of a likely fault, not proof of an offence — we test the rainfall, not the works' flow. Generated by River Teign Data.