← HARBERTONFORD STW_SSO_HARBERTONFORD
Spill evidence · Friends of the Dart
HARBERTONFORD STW_SSO_HARBERTONFORD
Storm overflow at the works · SBB00537 · feeds HARBERTONFORD_STW_HARBERTONFORD
Dry spill
Evidence strength
High confidence- ✓ Long discharge (≥6 h)
- ✓ Dry on the EA 1-day window
- ✓ Rain gauge close (≤5 km)
- ✓ Monitor 98% operational that year
The discharge
- Spill day
- Thursday, 20 November 2025
- Started
- 20 Nov 2025, 14:57
- Ended
- 20 Nov 2025, 22:09
- Duration
- 7 hours 12 minutes
- Receiving water
- Harbourne River
- Parish
- Harberton
Rainfall evidence
Daily rainfall at the matched gauge (Harbertonford Slipperstone) 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: Wet weather4-day window: Wet weather
| Date | Rainfall | |
|---|---|---|
| 20/11/2025 (spill day) | 0 mm | dry |
| 19/11/2025 | 0 mm | dry |
| 18/11/2025 | 1.5 mm | rain |
| 17/11/2025 | 0.2 mm | dry |
| 16/11/2025 | 0 mm | dry |
River flow that day: 14.624 m³/s. Verify at the EA rainfall station.
Gauge proximity
Outlet (red) vs matched rain gauge (blue), 2.6 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 (2025)
- 120 counted spills · 2494 h total
- Monitor uptime (2025)
- 98% 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 SBB00537). Rainfall: EA Hydrology gauge 8d954129-924c-47e3-8750-5f29a59617b2. 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.