Spill evidence · Friends of the Dart

Cornworthy STW, Dartmouth

Storm overflow at the works · SBB00309 · feeds CORNWORTHY_STW_DARTMOUTH

Dry spill

Evidence strength

High confidence

✓ Long discharge (≥6 h)
✓ Dry across a 4-day antecedent window

The discharge

Spill day: Thursday, 18 January 2024
Started: 18 Jan 2024, 21:46
Ended: 19 Jan 2024, 13:29
Duration: 15 hours 43 minutes
Receiving water: —
Parish: —

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
18/01/2024 (spill day)	0 mm	dry
17/01/2024	0 mm	dry
16/01/2024	0 mm	dry
15/01/2024	0 mm	dry
14/01/2024	0 mm	dry

River flow that day: 7.979 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

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 SBB00309). 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.