← 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 3-day window
- ✓ Rain gauge close (≤5 km)
- ✓ Monitor 100% operational that year
The discharge
- Spill day
- Wednesday, 10 November 2021
- Started
- 10 Nov 2021, 07:07
- Ended
- 10 Nov 2021, 08:44
- Duration
- 1 hour 37 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: Wet weather
| Date | Rainfall | |
|---|---|---|
| 10/11/2021 (spill day) | 0.1 mm | dry |
| 09/11/2021 | 0 mm | dry |
| 08/11/2021 | 0.2 mm | dry |
| 07/11/2021 | 0 mm | dry |
| 06/11/2021 | 3.3 mm | rain |
River flow that day: 9.374 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 (2021)
- 130 counted spills · 1276 h total
- Monitor uptime (2021)
- 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.