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Spill evidence · Friends of the Dart
Rattery STW
Storm overflow at the works · SBB01016 · feeds RATTERY_STW_RATTERY
Dry spill
Evidence strength
Medium confidence- ✓ Sustained discharge (≥1 h)
- ✓ Dry on the EA 1-day window
- ✓ Rain gauge close (≤5 km)
- ⚠ Monitor only 89% operational that year — data may be incomplete
The discharge
- Spill day
- Sunday, 15 December 2024
- Started
- 15 Dec 2024, 17:11
- Ended
- 15 Dec 2024, 20:18
- Duration
- 3 hours 7 minutes
- Receiving water
- Bidwell Brook
- Parish
- Rattery
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: Wet weather4-day window: Wet weather
| Date | Rainfall | |
|---|---|---|
| 15/12/2024 (spill day) | 0 mm | dry |
| 14/12/2024 | 0.1 mm | dry |
| 13/12/2024 | 0.7 mm | rain |
| 12/12/2024 | 0 mm | dry |
| 11/12/2024 | 0 mm | dry |
River flow that day: 10.265 m³/s. Verify at the EA rainfall station.
Gauge proximity
Outlet (red) vs matched rain gauge (blue), 4.3 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 (2024)
- 114 counted spills · 1768 h total
- Monitor uptime (2024)
- 89% 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 SBB01016). 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.