← Greenacres, Chagford
Spill evidence · Friends of the River Teign
Greenacres, Chagford
Combined sewer overflow · SBB00517 · feeds CHAGFORD MAIN_STW_CHAGFORD
Dry spill
Evidence strength
Low confidence- ✓ Dry on the EA 1-day window
- ✓ Monitor 96% operational that year
- ⚠ Short discharge (<1 h) — weaker signal
The discharge
- Spill day
- Saturday, 12 November 2022
- Started
- 12 Nov 2022, 08:54
- Ended
- 12 Nov 2022, 09:34
- Duration
- 40 minutes
- Receiving water
- Teign (Upper)
- Parish
- Chagford
Rainfall evidence
Daily rainfall at the matched gauge (Dartmoor Fernworthy) 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 | |
|---|---|---|
| 12/11/2022 (spill day) | 0.1 mm | dry |
| 11/11/2022 | 0 mm | dry |
| 10/11/2022 | 3.8 mm | rain |
| 09/11/2022 | 2.8 mm | rain |
| 08/11/2022 | 16.3 mm | rain |
River flow that day: 8.333 m³/s. Verify at the EA rainfall station.
Gauge proximity
Outlet (red) vs matched rain gauge (blue), 6.8 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
- Ahead of the works
- Yes — the treatment works' own overflow stayed shut that day, so capacity was available. Avoidable.
- EA annual return (2022)
- 149 counted spills · 1260 h total
- Monitor uptime (2022)
- 96% 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 SBB00517). Rainfall: EA Hydrology gauge 598e7d36-5ea6-4265-9d4b-d65e0e31ac8b. 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.