← Totnes STW
Spill evidence · Friends of the Dart
Totnes STW
Storm overflow at the works · SBB01264 · feeds TOTNES STW
Dry spill
Evidence strength
Low confidence- ✓ Dry on the EA 1-day window
- ✓ Monitor 100% operational that year
- ⚠ Short discharge (<1 h) — weaker signal
The discharge
- Spill day
- Friday, 5 November 2021
- Started
- 5 Nov 2021, 17:35
- Ended
- 5 Nov 2021, 17:58
- Duration
- 22 minutes 58 seconds
- Receiving water
- Dart
- Parish
- Totnes
Rainfall evidence
Daily rainfall at the matched gauge (Harbertonford Slipperstone) 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: Wet weather4-day window: Wet weather
| Date | Rainfall | |
|---|---|---|
| 05/11/2021 (spill day) | 0 mm | dry |
| 04/11/2021 | 0 mm | dry |
| 03/11/2021 | 3.1 mm | rain |
| 02/11/2021 | 0.1 mm | dry |
| 01/11/2021 | 2 mm | rain |
River flow that day: 13.251 m³/s. Verify at the EA rainfall station.
Gauge proximity
Outlet (red) vs matched rain gauge (blue), 6.5 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
- EA annual return (2021)
- 104 counted spills · 936 h total
- Monitor uptime (2021)
- 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 SBB01264). Rainfall: EA Hydrology gauge 8d954129-924c-47e3-8750-5f29a59617b2. 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.