Spill evidence · Friends of the Dart

Cornworthy STW, Dartmouth

Storm overflow at the works · SBB00309 · feeds CORNWORTHY_STW_DARTMOUTH

Wet weather

The discharge

Spill day: Saturday, 15 April 2023
Started: 15 Apr 2023, 08:18
Ended: 18 Apr 2023, 03:32
Duration: 2 days 19 hours
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: Wet weather3-day window: Wet weather4-day window: Wet weather

Date	Rainfall
15/04/2023 (spill day)	0 mm	dry
14/04/2023	1.1 mm	rain
13/04/2023	12.3 mm	rain
12/04/2023	19.7 mm	rain
11/04/2023	27.4 mm	rain

River flow that day: 16.203 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.