← Christow STW, Teign Valley
Spill evidence · Friends of the River Teign
Christow STW, Teign Valley
Storm overflow at the works · SBB00251 · feeds CHRISTOW_STW_TEIGN VALLEY
Dry spill
Evidence strength
Medium confidence- ✓ Dry across a 4-day antecedent window
- ✓ Monitor 96% operational that year
- ⚠ Short discharge (<1 h) — weaker signal
The discharge
- Spill day
- Thursday, 23 September 2021
- Started
- 23 Sept 2021, 10:23
- Ended
- 23 Sept 2021, 10:42
- Duration
- 18 minutes 9 seconds
- Receiving water
- Teign (Lower)
- Parish
- Christow
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 | |
|---|---|---|
| 23/09/2021 (spill day) | 0.2 mm | dry |
| 22/09/2021 | 0 mm | dry |
| 21/09/2021 | 0 mm | dry |
| 20/09/2021 | 0 mm | dry |
| 19/09/2021 | 0.2 mm | dry |
River flow that day: 0.763 m³/s. Verify at the EA rainfall station.
Gauge proximity
Outlet (red) vs matched rain gauge (blue), 7.3 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)
- 97 counted spills · 1915 h total
- Monitor uptime (2021)
- 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 SBB00251). 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.