← BROADHEMPSTON STW_SSO_BROADHEMPSTON
Spill evidence · Friends of the Dart
BROADHEMPSTON STW_SSO_BROADHEMPSTON
Storm overflow at the works · SBB00165 · feeds BROADHEMPSTON_STW_BROADHEMPSTON
Dry spill
Evidence strength
High confidence- ✓ Sustained discharge (≥1 h)
- ✓ Dry across a 4-day antecedent window
- ✓ Rain gauge close (≤5 km)
- ✓ Monitor 100% operational that year
The discharge
- Spill day
- Thursday, 18 January 2024
- Started
- 18 Jan 2024, 05:41
- Ended
- 18 Jan 2024, 06:48
- Duration
- 1 hour 6 minutes
- Receiving water
- Hems - Upper
- Parish
- Broadhempston
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 | |
|---|---|---|
| 18/01/2024 (spill day) | 0 mm | dry |
| 17/01/2024 | 0 mm | dry |
| 16/01/2024 | 0 mm | dry |
| 15/01/2024 | 0 mm | dry |
| 14/01/2024 | 0 mm | dry |
River flow that day: 7.979 m³/s. Verify at the EA rainfall station.
Gauge proximity
Outlet (red) vs matched rain gauge (blue), 4.7 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)
- 105 counted spills · 1791 h total
- Monitor uptime (2024)
- 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 SBB00165). 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.