← Rattery STW
Spill evidence · Friends of the Dart
Rattery STW
Storm overflow at the works · SBB01016 · feeds RATTERY_STW_RATTERY
Dry spill
Evidence strength
High confidence- ✓ Long discharge (≥6 h)
- ✓ Dry across a 4-day antecedent window
- ✓ Rain gauge close (≤5 km)
- ✓ Monitor 100% operational that year
The discharge
- Spill day
- Thursday, 25 May 2023
- Started
- 25 May 2023, 21:06
- Ended
- 26 May 2023, 09:42
- Duration
- 12 hours 36 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: Dry spill
| Date | Rainfall | |
|---|---|---|
| 25/05/2023 (spill day) | 0 mm | dry |
| 24/05/2023 | 0 mm | dry |
| 23/05/2023 | 0 mm | dry |
| 22/05/2023 | 0 mm | dry |
| 21/05/2023 | 0 mm | dry |
River flow that day: 5.163 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 (2023)
- 149 counted spills · 2429 h total
- Monitor uptime (2023)
- 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.