← 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 98% operational that year
- ⚠ Short discharge (<1 h) — weaker signal
The discharge
- Spill day
- Thursday, 11 March 2021
- Started
- 11 Mar 2021, 09:30
- Ended
- 11 Mar 2021, 10:06
- Duration
- 35 minutes 36 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 | |
|---|---|---|
| 11/03/2021 (spill day) | 0 mm | dry |
| 10/03/2021 | 0 mm | dry |
| 09/03/2021 | 5.1 mm | rain |
| 08/03/2021 | 0 mm | dry |
| 07/03/2021 | 0.1 mm | dry |
River flow that day: 7.528 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 (2021)
- 75 counted spills · 462 h total
- Monitor uptime (2021)
- 98% 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.