← Compton Castle
Spill evidence · Friends of the River Teign
Compton Castle
Combined sewer overflow · SBB00301 · feeds COMPTON AND MARLDON STW
Dry spill
Evidence strength
Medium confidence- ✓ Long discharge (≥6 h)
- ✓ Dry across a 4-day antecedent window
- ✓ Rain gauge close (≤5 km)
- ⚠ Monitor only 79% operational that year — data may be incomplete
The discharge
- Spill day
- Wednesday, 31 December 2025
- Started
- 31 Dec 2025, 05:34
- Ended
- 1 Jan 2026, 00:00
- Duration
- 18 hours 25 minutes
- Receiving water
- Aller Brook
- Parish
- Marldon
Rainfall evidence
Daily rainfall at the matched gauge (Torbay Compton) 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 | |
|---|---|---|
| 31/12/2025 (spill day) | 0.1 mm | dry |
| 30/12/2025 | 0.1 mm | dry |
| 29/12/2025 | 0 mm | dry |
| 28/12/2025 | 0.1 mm | dry |
| 27/12/2025 | 0 mm | dry |
River flow that day: 5.482 m³/s. Verify at the EA rainfall station.
Gauge proximity
Outlet (red) vs matched rain gauge (blue), 1.4 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
- Teign Estuary
- Ahead of the works
- Yes — the treatment works' own overflow stayed shut that day, so capacity was available. Avoidable.
- EA annual return (2025)
- 69 counted spills · 659 h total
- Monitor uptime (2025)
- 79% 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 SBB00301). Rainfall: EA Hydrology gauge e7e2f7d4-f497-4adc-b077-c20bc2dcedfa. 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.