We use cookies to make this site simpler. By browsing our pages you are accepting our use of cookies. Find out more on our cookies and privacy page.
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


Summary (optional)
start content

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

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

Programme:

Design phase: completed 31 May 2021

Construction tender phase: June 2021

Phase 1 - Construction: September to October 2021

  • A544 culvert upgrade
  • Dalar Bach river restoration
  • Llain Hiraethog channel improvement work:

    • New floodwall along the left bank within the carpark 
    • New vehicle bridge
    • Upgrades to the existing left bank channel wall
    • New pedestrian bridge and communal area
    • New communal area at Ffordd Gogor culvert inlet


Phase 2 - Utility diversions: Winter 2021/2022

Phase 3 – Construction: starting Spring 2022

  • Ffordd Gogor Culvert replacement including a new inlet at Llain Hiraethog and outlet at the Uwch Yr Aled Channel
  • Highway drainage system improvements
  • Welsh Water foul sewer diversion


Traffic management during construction:

  • A544 single lane road closure during autumn 2021
  • Ffordd Gogor full road closure during summer 2022

Proposed scheme (PDF)

end content