← HARBERTON STW_SO_HARBERTON
Spill evidence · Friends of the Dart
HARBERTON STW_SO_HARBERTON
Storm overflow at the works · SBB00535 · feeds HARBERTON_STW_HARBERTON
Dry spill
Evidence strength
Medium confidence- ✓ Dry on the EA 1-day window
- ✓ Rain gauge close (≤5 km)
- ✓ Monitor 99% operational that year
- ⚠ Short discharge (<1 h) — weaker signal
The discharge
- Spill day
- Monday, 17 April 2023
- Started
- 17 Apr 2023, 14:09
- Ended
- 17 Apr 2023, 14:30
- Duration
- 20 minutes 59 seconds
- 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 | |
|---|---|---|
| 17/04/2023 (spill day) | 0 mm | dry |
| 16/04/2023 | 0 mm | dry |
| 15/04/2023 | 0 mm | dry |
| 14/04/2023 | 1.1 mm | rain |
| 13/04/2023 | 12.3 mm | rain |
River flow that day: 13.257 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 (2023)
- 157 counted spills · 1666 h total
- Monitor uptime (2023)
- 99% 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 SBB00535). 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.