Essential Website Maintenance – Thursday 9th January 2020

We will be carrying out essential website maintenance in the afternoon which will affect some functionality. We apologise in advance for any inconvenience the work may cause and will do all we can to keep disruption to an absolute minimum.

Llansannan Flood Alleviation Scheme

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About the scheme

What will the scheme do?

  • Reduce the risk of flooding to the village
  • Increase the capacity of the system by over 70%.

This will be achieved by:

  • Increasing the size of existing culverts
  • Widening river channels
  • Removing obstacles in channels

The work involves:

  • increasing the size of the culvert crossing the A544 at the north end of the village
  • improving the river channel in Dalar Bach
  • building new floodwalls  in Dalar Bach at the carpark through to Llain Hiraethog inlet
  • improving the channel in front of Llain Hiraethog
  • replacing the culvert from the Llain Hiraethog channel down Ffordd Gogor and connecting back into the Afon Bach at Uwch yr Aled

The work will also include:

  • Diverting BT cables, the Welsh Water foul sewer and water mains
  • Creating a seating  area at Llain Hiraethog

Environmental benefits:

  • Removing weir structures at three locations to help fish migration
  • Installing baffles along the channel bed to give resting points for migrating fish
  • Installing vegetated retaining wall to improve biodiversity

Social benefits:

  • Creating two new communal areas along the A544

Project funding:

  • 85% funded by Welsh Government
  • 15% funded by Conwy County Borough Council


Design phase: completed 31 May 2021
Construction tender phase: June 2021

Work starts: February 2022

Road Closure Dates and Locations

  1. Footpath and carpark between Maes Creiniog and Ffordd Gogor for 12 weeks, from Monday 9 May to Wednesday 20 July (expected date).
  2. A544, North of the village for 3 days, from Sunday 12 June to Wednesday 15 June.
  3. Ffordd Gogor for 12 weeks, from Wednesday 20 July to Saturday 29 October (expected date).
  4. North end of Ffordd Gogor and A544 for 4.5 weeks from Tuesday 20 September to Saturday 29 October (expected date).

More information

For regular updates visit MWT’s project website:

If you have questions, please contact:

MWT’s Public Liaison Officer Lauren Thomas
Email: or call 01492 338280

The Council’s Environment, Roads & Facilities advice team
Email: or call 01492 575337

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