← Drewsteignton STW, Chagford
Spill evidence · Friends of the River Teign
Drewsteignton STW, Chagford
Storm overflow at the works · SBB00376 · feeds DREWSTEIGNTON_STW_CHAGFORD
Dry spill
Evidence strength
Medium confidence- ✓ Dry across a 4-day antecedent window
- ✓ Rain gauge close (≤5 km)
- ⚠ Short discharge (<1 h) — weaker signal
- ⚠ Monitor only 85% operational that year — data may be incomplete
The discharge
- Spill day
- Wednesday, 30 April 2025
- Started
- 30 Apr 2025, 11:08
- Ended
- 30 Apr 2025, 11:24
- Duration
- 16 minutes 30 seconds
- Receiving water
- Fingle Brook
- Parish
- Drewsteignton
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: Dry spill4-day window: Dry spill
| Date | Rainfall | |
|---|---|---|
| 30/04/2025 (spill day) | 0 mm | dry |
| 29/04/2025 | 0 mm | dry |
| 28/04/2025 | 0 mm | dry |
| 27/04/2025 | 0 mm | dry |
| 26/04/2025 | 0.1 mm | dry |
River flow that day: 2.975 m³/s. Verify at the EA rainfall station.
Gauge proximity
Outlet (red) vs matched rain gauge (blue), 4.8 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
- EA annual return (2025)
- 26 counted spills · 70 h total
- Monitor uptime (2025)
- 85% 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 SBB00376). 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.