← Ashprington STW
Spill evidence · Friends of the Dart
Ashprington STW
Storm overflow at the works · SBB00053 · feeds ASHPRINGTON_STW_ASHPRINGTON
Dry spill
Evidence strength
Low confidence- ✓ Dry on the EA 1-day window
- ✓ Rain gauge close (≤5 km)
- ⚠ Short discharge (<1 h) — weaker signal
- ⚠ Monitor only 85% operational that year — data may be incomplete
The discharge
- Spill day
- Wednesday, 18 January 2023
- Started
- 18 Jan 2023, 11:13
- Ended
- 18 Jan 2023, 11:32
- Duration
- 19 minutes
- Receiving water
- Harbourne River
- Parish
- Ashprington
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 | |
|---|---|---|
| 18/01/2023 (spill day) | 0.1 mm | dry |
| 17/01/2023 | 0.1 mm | dry |
| 16/01/2023 | 0 mm | dry |
| 15/01/2023 | 25.6 mm | rain |
| 14/01/2023 | 4.4 mm | rain |
River flow that day: 28.896 m³/s. Verify at the EA rainfall station.
Gauge proximity
Outlet (red) vs matched rain gauge (blue), 5.0 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
- Dart
- EA annual return (2023)
- 44 counted spills · 376 h total
- Monitor uptime (2023)
- 85% 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 SBB00053). 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.