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Spill evidence · Friends of the Dart
RATTERY STW_SO_RATTERY
Storm overflow at the works · SBB01016 · feeds RATTERY_STW_RATTERY
Dry spill
Evidence strength
High confidence- ✓ Long discharge (≥6 h)
- ✓ Dry across a 3-day window
- ✓ Rain gauge close (≤5 km)
The discharge
- Spill day
- Thursday, 5 March 2026
- Started
- 5 Mar 2026, 07:44
- Ended
- 5 Mar 2026, 15:00
- Duration
- 7 hours 16 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: Dry spill4-day window: Wet weather
| Date | Rainfall | |
|---|---|---|
| 05/03/2026 (spill day) | 0.1 mm | dry |
| 04/03/2026 | 0 mm | dry |
| 03/03/2026 | 0 mm | dry |
| 02/03/2026 | 0 mm | dry |
| 01/03/2026 | 1.6 mm | rain |
River flow that day: 15.823 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.
Loading map…
Severity & context
- Bathing water
- Not Applicable
- Shellfish water
- Not Applicable
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.