← DARTINGTON C_CSO_DARTINGTON
Spill evidence · Friends of the Dart
DARTINGTON C_CSO_DARTINGTON
Combined sewer overflow · SBB00350 · feeds TOTNES STW
Dry spill
Evidence strength
Medium confidence- ✓ Sustained discharge (≥1 h)
- ✓ Dry across a 3-day window
- ✓ Monitor 95% operational that year
The discharge
- Spill day
- Monday, 4 September 2023
- Started
- 4 Sept 2023, 09:14
- Ended
- 4 Sept 2023, 11:06
- Duration
- 1 hour 51 minutes
- Receiving water
- Bidwell Brook
- Parish
- Dartington
Rainfall evidence
Daily rainfall at the matched gauge (Austins Bridge) 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: Wet weather
| Date | Rainfall | |
|---|---|---|
| 04/09/2023 (spill day) | 0 mm | dry |
| 03/09/2023 | 0 mm | dry |
| 02/09/2023 | 0 mm | dry |
| 01/09/2023 | 0 mm | dry |
| 31/08/2023 | 7.9 mm | rain |
River flow that day: 4.073 m³/s. Verify at the EA rainfall station.
Gauge proximity
Outlet (red) vs matched rain gauge (blue), 5.6 km apart. Closer means the rainfall reading is more representative of the overflow.
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Severity & context
- Bathing water
- Steamer Quay, Dart Estuary
- Shellfish water
- Dart
- Ahead of the works
- Yes — the treatment works' own overflow stayed shut that day, so capacity was available. Avoidable.
- EA annual return (2023)
- 83 counted spills · 750 h total
- Monitor uptime (2023)
- 95% 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 SBB00350). Rainfall: EA Hydrology gauge fd8ea26c-8052-48c5-a1bb-bbd5ebbbb3d3_364176. 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 Hub.