← Harberton STW
Spill evidence · Friends of the Dart
Harberton STW
Storm overflow at the works · SBB00536 · feeds HARBERTON_STW_HARBERTON
Dry spill
Evidence strength
Medium confidence- ✓ Dry across a 3-day window
- ✓ Rain gauge close (≤5 km)
- ✓ Monitor 100% operational that year
- ⚠ Short discharge (<1 h) — weaker signal
The discharge
- Spill day
- Friday, 26 December 2025
- Started
- 26 Dec 2025, 09:15
- Ended
- 26 Dec 2025, 09:30
- Duration
- 15 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: Dry spill4-day window: Wet weather
| Date | Rainfall | |
|---|---|---|
| 26/12/2025 (spill day) | 0 mm | dry |
| 25/12/2025 | 0 mm | dry |
| 24/12/2025 | 0 mm | dry |
| 23/12/2025 | 0.2 mm | dry |
| 22/12/2025 | 0.6 mm | rain |
River flow that day: 15.391 m³/s. Verify at the EA rainfall station.
Gauge proximity
Outlet (red) vs matched rain gauge (blue), 2.5 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)
- 116 counted spills · 1660 h total
- Monitor uptime (2025)
- 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 SBB00536). 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.