Spill evidence · Friends of the Dart

Stonepark Crescent, Ashburton

Combined sewer overflow · SBB01186 · feeds BUCKFASTLEIGH STW

Wet weather

The discharge

Spill day: Saturday, 11 November 2023
Started: 11 Nov 2023, 23:42
Ended: 12 Nov 2023, 00:05
Duration: 23 minutes 20 seconds
Receiving water: Ashburn
Parish: Ashburton

Rainfall evidence

Daily rainfall at the matched gauge (Austins Bridge) 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
11/11/2023 (spill day)	12.9 mm	rain
10/11/2023	0.3 mm	rain
09/11/2023	15.5 mm	rain
08/11/2023	2.5 mm	rain
07/11/2023	27.5 mm	rain

River flow that day: 26.572 m³/s. Verify at the EA rainfall station.

Gauge proximity

Outlet (red) vs matched rain gauge (blue), 3.6 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
Ahead of the works: No — the works was also overflowing that day.
EA annual return (2023): 67 counted spills · 377 h total
Monitor uptime (2023): 100% 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 SBB01186). Rainfall: EA Hydrology gauge fd8ea26c-8052-48c5-a1bb-bbd5ebbbb3d3_364176. 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.