← Townstal Tank, Dartmouth
Spill evidence · Friends of the Dart
Townstal Tank, Dartmouth
Combined sewer overflow · SBB01269 · feeds DARTMOUTH STW
Dry spill
Evidence strength
Medium confidence- ✓ Dry across a 4-day antecedent window
The discharge
- Spill day
- Friday, 22 July 2022
- Started
- 22 Jul 2022, 17:58
- Ended
- 22 Jul 2022, 17:58
- Duration
- 0 seconds
- Receiving water
- —
- Parish
- —
Rainfall evidence
Daily rainfall at the matched gauge (Brixham) 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 | |
|---|---|---|
| 22/07/2022 (spill day) | 0 mm | dry |
| 21/07/2022 | 0 mm | dry |
| 20/07/2022 | 0.2 mm | dry |
| 19/07/2022 | 0.1 mm | dry |
| 18/07/2022 | 0 mm | dry |
River flow that day: 1.317 m³/s. Verify at the EA rainfall station.
Gauge proximity
Outlet (red) vs matched rain gauge (blue), 6.1 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
- Dart
- Ahead of the works
- Unknown (no works overflow data)
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 SBB01269). Rainfall: EA Hydrology gauge 9dba2bf3-f5ea-4616-ac8e-dce16dbc0dc8. 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.