← HOLNE STW_SO_HOLNE
Spill evidence · Friends of the Dart
HOLNE STW_SO_HOLNE
Storm overflow at the works · SBB00581 · feeds HOLNE_STW_HOLNE
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
- Sunday, 12 October 2025
- Started
- 12 Oct 2025, 07:26
- Ended
- 12 Oct 2025, 08:32
- Duration
- 1 hour 5 minutes
- Receiving water
- Dart
- Parish
- West Buckfastleigh
Rainfall evidence
Daily rainfall at the matched gauge (Holne Priddons Farm) 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 | |
|---|---|---|
| 12/10/2025 (spill day) | 0.2 mm | dry |
| 11/10/2025 | 0 mm | dry |
| 10/10/2025 | 0 mm | dry |
| 09/10/2025 | 0 mm | dry |
| 08/10/2025 | 0 mm | dry |
River flow that day: 4.346 m³/s. Verify at the EA rainfall station.
Gauge proximity
Outlet (red) vs matched rain gauge (blue), 2.1 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)
- 117 counted spills · 1405 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 SBB00581). Rainfall: EA Hydrology gauge b000c3f6-3922-48ea-8726-4173de4998d0. 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.