← 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- ✓ Long discharge (≥6 h)
- ✓ Dry across a 3-day window
- ✓ Rain gauge close (≤5 km)
- ✓ Monitor 100% operational that year
The discharge
- Spill day
- Thursday, 23 November 2023
- Started
- 23 Nov 2023, 12:26
- Ended
- 23 Nov 2023, 23:00
- Duration
- 10 hours 34 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: Wet weather
| Date | Rainfall | |
|---|---|---|
| 23/11/2023 (spill day) | 0 mm | dry |
| 22/11/2023 | 0 mm | dry |
| 21/11/2023 | 0 mm | dry |
| 20/11/2023 | 0 mm | dry |
| 19/11/2023 | 5.1 mm | rain |
River flow that day: 17.695 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 (2023)
- 87 counted spills · 1761 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 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.