← 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
- ⚠ Short discharge (<1 h) — weaker signal
- ⚠ Monitor only 41% operational that year — data may be incomplete
The discharge
- Spill day
- Wednesday, 5 January 2022
- Started
- 5 Jan 2022, 11:42
- Ended
- 5 Jan 2022, 12:03
- Duration
- 21 minutes
- 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 | |
|---|---|---|
| 05/01/2022 (spill day) | 0 mm | dry |
| 04/01/2022 | 0 mm | dry |
| 03/01/2022 | 0.5 mm | rain |
| 02/01/2022 | 13.1 mm | rain |
| 01/01/2022 | 8 mm | rain |
River flow that day: 15.701 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 (2022)
- 70 counted spills · 1335 h total
- Monitor uptime (2022)
- 41% 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.