← 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
Medium confidence- ✓ Long discharge (≥6 h)
- ✓ Dry on the EA 1-day window
- ✓ Rain gauge close (≤5 km)
The discharge
- Spill day
- Thursday, 19 March 2026
- Started
- 19 Mar 2026, 10:52
- Ended
- 22 Mar 2026, 16:13
- Duration
- 3 days 5 hours
- 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 | |
|---|---|---|
| 19/03/2026 (spill day) | 0 mm | dry |
| 18/03/2026 | 0 mm | dry |
| 17/03/2026 | 0.3 mm | rain |
| 16/03/2026 | 1.8 mm | rain |
| 15/03/2026 | 5.6 mm | rain |
River flow that day: 11.135 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.
Loading map…
Severity & context
- Bathing water
- Not Applicable
- Shellfish water
- Not Applicable
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.