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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
High confidence- ✓ Dry across a 4-day antecedent window
- ✓ Rain gauge close (≤5 km)
- ✓ Monitor 100% operational that year
The discharge
- Spill day
- Wednesday, 31 August 2022
- Started
- 31 Aug 2022, 17:51
- Ended
- 31 Aug 2022, 17:51
- Duration
- 0 seconds
- 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: Dry spill
| Date | Rainfall | |
|---|---|---|
| 31/08/2022 (spill day) | 0 mm | dry |
| 30/08/2022 | 0 mm | dry |
| 29/08/2022 | 0 mm | dry |
| 28/08/2022 | 0 mm | dry |
| 27/08/2022 | 0 mm | dry |
River flow that day: 1.055 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 (2022)
- 140 counted spills · 1956 h total
- Monitor uptime (2022)
- 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 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.