← Dunsford STW, Teign Valley
Spill evidence · Friends of the River Teign
Dunsford STW, Teign Valley
Storm overflow at the works · SBB00388 · feeds DUNSFORD_STW_TEIGN VALLEY
Dry spill
Evidence strength
High confidence- ✓ Sustained discharge (≥1 h)
- ✓ Dry across a 4-day antecedent window
- ✓ Rain gauge close (≤5 km)
- ✓ Monitor 100% operational that year
The discharge
- Spill day
- Friday, 9 December 2022
- Started
- 9 Dec 2022, 23:20
- Ended
- 10 Dec 2022, 00:35
- Duration
- 1 hour 15 minutes
- Receiving water
- Reedy Brook
- Parish
- Dunsford
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 | |
|---|---|---|
| 09/12/2022 (spill day) | 0.2 mm | dry |
| 08/12/2022 | 0 mm | dry |
| 07/12/2022 | 0 mm | dry |
| 06/12/2022 | 0 mm | dry |
| 05/12/2022 | 0 mm | dry |
River flow that day: 4.444 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 (2022)
- 98 counted spills · 2051 h total
- Monitor uptime (2022)
- 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 SBB00388). 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.