Coursington WwTW CSO
Storm overflow run by Scottish Water, discharging into South Calder Water.
"Not discharging" means the company's monitor reports no discharge right now — not that the water is clean. The feed publishes status only; no discharge volume is measured.
Year by year
Scottish Water's published data for monitored overflows (number of overflow events; Scottish Water does not use the 12/24-hour count). 2026 is our own running count, the same way, from the live feed since 28 February (when we began keeping every discharge it reports) — so it can only be lower than the full year. The official figure is published next spring.
"No data" means the monitor was not working or not required to report that year — not zero. Scottish Water counts each overflow event; England and Wales count 12/24-hour "spills", so these numbers are not directly comparable with English or Welsh overflows.
Other outlets here
Scottish Water runs 5 other overflows within 300 m that also discharge into South Calder Water. They share the sewer and the storm, so one outlet's figures are only part of what reaches the water.
This overflow: 103 spills in 2025. Distances are between the published outlet points.
Downstream of this overflow
The next gauge downstream that the river map places is Blairston (Clyde), 8.9 km along the river.
A river gauge measures the level of the river; it does not measure this overflow's discharge, and a spill does not by itself explain a change there. Traced on OS Open Rivers (edition 2026-04), which leaves out many small channels.
Contains OS data © Crown copyright and database rights 2026.
Discharges we have recorded
103 discharge periods since 1 Jan 2025. 103 of them come from Scottish Water's own event-duration-monitoring records (published by the company, Jan 2025 – Dec 2025); the live feed adds anything after that. The official annual count is the figure to quote.
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Thu 18 Dec 2025, 20:1545 min
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Thu 18 Dec 2025, 19:0045 min
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Wed 17 Dec 2025, 15:3045 min
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Sun 14 Dec 2025, 19:4545 min
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Sun 14 Dec 2025, 00:153 h 45 min
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Sat 13 Dec 2025, 15:152 h 0 min
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Fri 12 Dec 2025, 02:1545 min
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Wed 10 Dec 2025, 12:4545 min
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Wed 10 Dec 2025, 08:0030 min
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Tue 9 Dec 2025, 21:002 h 0 min
Show 30 earlier (of 103)
| Started (UK time) | Ended | Discharge time |
|---|---|---|
| 9 Dec 2025, 20:00 | 20:30 | 30 min |
| 9 Dec 2025, 05:45 | 12:45 | 7 h 0 min |
| 8 Dec 2025, 06:30 | 07:00 | 30 min |
| 7 Dec 2025, 14:45 | 22:45 | 8 h 0 min |
| 1 Dec 2025, 18:45 | 00:00 | 5 h 15 min |
| 1 Dec 2025, 08:00 | 09:00 | 1 h 0 min |
| 1 Dec 2025, 04:15 | 06:00 | 1 h 45 min |
| 26 Nov 2025, 21:45 | 23:15 | 1 h 30 min |
| 23 Nov 2025, 07:15 | 08:00 | 45 min |
| 23 Nov 2025, 05:15 | 06:30 | 1 h 15 min |
| 18 Nov 2025, 20:45 | 21:45 | 1 h 0 min |
| 13 Nov 2025, 18:45 | 21:15 | 2 h 30 min |
| 13 Nov 2025, 02:00 | 11:15 | 9 h 15 min |
| 11 Nov 2025, 23:45 | 00:30 | 45 min |
| 11 Nov 2025, 16:45 | 20:15 | 3 h 30 min |
| 11 Nov 2025, 10:30 | 16:15 | 5 h 45 min |
| 10 Nov 2025, 05:45 | 08:00 | 2 h 15 min |
| 5 Nov 2025, 10:45 | 13:15 | 2 h 30 min |
| 3 Nov 2025, 22:00 | 23:15 | 1 h 15 min |
| 3 Nov 2025, 14:30 | 16:30 | 2 h 0 min |
| 3 Nov 2025, 08:15 | 09:00 | 45 min |
| 3 Nov 2025, 04:00 | 04:45 | 45 min |
| 3 Nov 2025, 02:30 | 03:00 | 30 min |
| 1 Nov 2025, 08:45 | 09:45 | 1 h 0 min |
| 1 Nov 2025, 01:15 | 02:15 | 1 h 0 min |
| 29 Oct 2025, 16:30 | 17:30 | 1 h 0 min |
| 29 Oct 2025, 00:15 | 00:45 | 30 min |
| 21 Oct 2025, 09:15 | 09:45 | 30 min |
| 19 Oct 2025, 18:30 | 19:00 | 30 min |
| 19 Oct 2025, 17:00 | 17:30 | 30 min |
The year figures above use the EA's 12/24-hour counting method, so they are comparable with the official figures.
Rain nearby last 30 days
Nearest live rain gauge: Daldowie STW, 9.5 km away. Brown shading = when this overflow was discharging; ▼ = a discharge start.
Overflow shading is a timing match, not proof of cause — heavy rain and spills share a trigger. Times come from the water company’s event-duration monitor (site status only; no discharge volume is published).
Where it is
Concerned about this overflow?
Report pollution you can see or smell to the regulator straight away; the company handles complaints about the overflow itself.
Live status: © Scottish Water, near-real-time Overflow Map data, open licence for reuse. EDM monitors indicate overflows; they do not confirm them, and this is not advice on water quality. Spill-event history and annual figures: Scottish Water overflow event data, Open Government Licence. Times are shown in UK local time. FloodRadar republishes the monitor's status; it does not measure discharges itself.