← 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 4-day antecedent window
- ✓ Rain gauge close (≤5 km)
- ⚠ Short discharge (<1 h) — weaker signal
- ⚠ Monitor only 87% operational that year — data may be incomplete
The discharge
- Spill day
- Monday, 5 December 2022
- Started
- 5 Dec 2022, 17:34
- Ended
- 5 Dec 2022, 18:15
- Duration
- 41 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: Dry spill
| Date | Rainfall | |
|---|---|---|
| 05/12/2022 (spill day) | 0 mm | dry |
| 04/12/2022 | 0 mm | dry |
| 03/12/2022 | 0 mm | dry |
| 02/12/2022 | 0.1 mm | dry |
| 01/12/2022 | 0 mm | dry |
River flow that day: 11.079 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.
Loading map…
Severity & context
- Bathing water
- Not Applicable
- Shellfish water
- Not Applicable
- EA annual return (2022)
- 129 counted spills · 2137 h total
- Monitor uptime (2022)
- 87% 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.