← Harbertonford STW
Spill evidence · Friends of the Dart
Harbertonford STW
Storm overflow at the works · SBB00537 · feeds HARBERTONFORD_STW_HARBERTONFORD
Dry spill
Evidence strength
Medium confidence- ✓ Dry on the EA 1-day window
- ✓ Rain gauge close (≤5 km)
- ✓ Monitor 97% operational that year
- ⚠ Short discharge (<1 h) — weaker signal
The discharge
- Spill day
- Saturday, 13 May 2023
- Started
- 13 May 2023, 13:34
- Ended
- 13 May 2023, 13:54
- Duration
- 19 minutes 55 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 | |
|---|---|---|
| 13/05/2023 (spill day) | 0 mm | dry |
| 12/05/2023 | 0 mm | dry |
| 11/05/2023 | 0.5 mm | rain |
| 10/05/2023 | 3.1 mm | rain |
| 09/05/2023 | 4.6 mm | rain |
River flow that day: 10.858 m³/s. Verify at the EA rainfall station.
Gauge proximity
Outlet (red) vs matched rain gauge (blue), 2.6 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 (2023)
- 160 counted spills · 3308 h total
- Monitor uptime (2023)
- 97% 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 SBB00537). 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.