Rhydlafar WwTW Storm Overflow

Year by year

Dŵr Cymru Welsh Water's annual Event Duration Monitoring return to Natural Resources Wales (12/24-hour spill count), as compiled by The Rivers Trust. 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.

Discharges we have recorded

1,034 discharge periods since 2 Jan 2020, 1 still open. 1,034 of them come from Dwr Cymru Welsh Water's own event-duration-monitoring records (published by the company, Jan 2020 – Dec 2023); the live feed adds anything after that. The official annual count is the figure to quote.

• Sun 31 Dec 2023, 11:00
  ongoing
  still discharging · EDM log · 631 blocks
• Sat 30 Dec 2023, 18:45
  10 h 15 min
  ended 05:15 · EDM log · 2 blocks
• Sat 30 Dec 2023, 17:00
  1 h 15 min
  ended 18:15 · EDM log
• Fri 29 Dec 2023, 10:00
  1 h 45 min
  ended 11:45 · EDM log
• Fri 29 Dec 2023, 04:45
  45 min
  ended 05:30 · EDM log
• Thu 28 Dec 2023, 23:30
  30 min
  ended 00:00 · EDM log
• Thu 28 Dec 2023, 22:15
  30 min
  ended 23:00 · EDM log · 2 blocks
• Thu 28 Dec 2023, 20:15
  1 h 0 min
  ended 21:30 · EDM log · 2 blocks
• Thu 28 Dec 2023, 18:45
  30 min
  ended 19:30 · EDM log · 2 blocks
• Thu 28 Dec 2023, 16:15
  30 min
  ended 17:00 · EDM log · 2 blocks

The year figures above use the EA's 12/24-hour counting method, so they are comparable with the official figures; the monitor log's 2,003 raw blocks were merged into 1,034 continuous discharge periods (gaps under 15 min joined).

Concerned about this overflow?

Report pollution you can see or smell to the regulator straight away; the company handles complaints about the overflow itself.