Design elements

Options currently being considered

1) Walk away

This is being considered only as a theoretical baseline for us to compare the relative successes of other options. If we were to ‘walkaway’ then all seafront maintenance would cease, no flood response would be implemented, and natural processes would be allowed to take over.

2) Business as usual

Business as usual is defined as “Undertaking the minimum amount of action or intervention necessary to deliver the legal requirement or sustain the standard of service of the current defences”. This means carrying on with the maintenance of the current promenade, continuing to issue flood warnings, and implementing flood responses.

3) Full coastal wall

This option involves the construction of a new sea wall stretching from the Welsh Water pumping station near Beach Road west car park to the far end of Beach Road east car park. This option is designed to repel a 1/100 year flood event with 2050’s anticipated sea level. This will also involve the removal of existing defences, the sea wall at Beach Road east car park and the revetment at the pumping station.

4) Coastal wall set-back along Beach road

Similar to option 3, the current defences will be removed and a continuous line of new defences will stretch from the Welsh Water pumping station near Beach Road west car park to the end of Beach Road east car park. The only major difference is that properties behind Beach Road shall be protected by a linear defence and flood gate situated to the south of Beach Road east car park.

5) Raised ground along Beach road

Similar to option 4, this option comprises the removal of the revetment at the Welsh Water pumping station to prevent a flood route via Beach Road. A short length of defence is also needed adjacent to Glandwr Road. Properties behind Beach Road shall be defended by raising the level of Beach Road east car park. This will involve the re-construction of the car park and an allowance for a re-route of the coastal path if needed. New retaining walls along the promenade are also needed.

Options map

This map provides a basic outline of the three ‘constructed’ options currently being considered. In all three cases, we have concluded that a new coastal wall is needed from Beach Road west car park to the skate park west of Beach Road east car park.

Business as usual

If no improvements are made, flood modelling has shown that approximately 47 properties are at risk of flooding if a 1/200 year flood event were to occur today.

Factoring in sea level rise by 2055, this number could rise to 267 properties, 17 of which are commercial.

The diagram you see here represents a 1/100 year flood event with current, and 2055 sea levels.

Further details to follow. We will be shortly consulting the public on possible options. Any comments or feedback will be considered as we move to the next phase of the project and a preferred option is selected.

Hirael flood prevention scheme

FCRMU@gwynedd.llyw.cymru

YGC | Ymgynghoriaeth Gwynedd Consultancy

 

Shirehall Street

 

Caernarfon

 

Gwynedd

 

LL55 1SH