Flood defence projects

There are lots of different flood defence projects in Wales. Flood modelling projects look at data from rainfall, river flows and tidal water to help us understand flood risk. This information can be used to design, build and look after flood defences that help protect against flooding from rivers or the sea.

Local authorities and private landowners also look after some flood defence structures.

Search all flood defence projects

Project name Local Authority Stage Forecast Completion Date
Cwm erosion repairs Blaenau Gwent Construction 2022-2023
Bridgend Blockstone and bank repairs Bridgend Construction 2022-2023
Llyn Tegid reservoir safety works Gwynedd Construction 2022-2023
Stephenson street floods risk management scheme Newport Construction 2024-2025
Cowbridge flood reservoir improvements The Vale of Glamorgan Construction 2022-2023
Caerphilly erosion repairs Caerphilly Construction 2022-2023
Llanfair Talhaiarn flood risk management scheme Conwy Construction 2022-2023
Ammanford flood risk management project Carmarthenshire Construction 2024-2025
Afon Wydden spillway works Conwy Construction 2022-2023
Porthmadog tidal sustain project Gwynedd Appraisal 2026-2027
Tidal Dyfi flood risk management scheme  Gwynedd Appraisal 2023-2024
Ritec culvert improvement assessment Pembrokeshire Construction 2022-2023
Cardigan flood risk management scheme Ceredigion Appraisal 2024-2025
Foryd Bay and Dinas Dinlle - coastal adaptation plan Gwynedd Appraisal 2024-2025
Merthyr weir Merthyr Tydfil Construction 2023-2024
Aberdulais property protection Neath Port Talbot Construction 2022-2023
Eel passage improvements North Wales Construction 2022-2023
Dwyran flood risk management scheme Isle of Anglesey Appraisal 2024-2025
Tan Lan embankment viability study Conwy Appraisal 2022-2023
Llanfair Talhaiarn property protection Conwy Appraisal 2022-2023
Fiddlers elbow gauging station Rhondda Cynon Taf Construction 2023-2024
Natural flood management plus in the Cadoxton catchment The Vale of Glamorgan Design 2024-2025
Mwche managed realignment Carmarthenshire Appraisal 2024-2025

Pwllheli flood risk management scheme

Gwynedd Appraisal 2026-2027
Dyfi gauging station Powys Construction 2023-2024
Fairbourne flood risk management scheme Gwynedd Project Closure 2022-2023
Presteigne flood risk management scheme Powys Construction 2023-2024
North Wales hydrometry winch replacement North Wales Construction 2022-2023
Llanfair Talhaiarn natural flood management scheme Conwy Construction 2022-2023
Broadwater, Tywyn - coastal adaptation plan Gwynedd Appraisal 2024-2025

Canal side Aberdulais flood risk management scheme

Neath Port Talbot Appraisal 2023-2024
Rhondda flood modelling Rhondda Cynon Taf Appraisal 2022-2023
Afon Gele flood modelling Conwy Appraisal 2022-2023
Friog cliffs sea defence repairs Gwynedd Project Closure 2022-2023
South Tremadog Bay tidal risk analysis scoping Gwynedd Appraisal 2022-2023
Caerleon flood scheme (permanent flood gate) Newport Construction 2022-2023
Pumping station review North Wales Appraisal 2022-2023
Llanelwedd property protection Powys Construction 2022-2023
Llynnau Caeconroi - orphan reservoir safety works Powys Design 2024-2025
Crynant property level protection Neath Port Talbot Construction 2022-2023
Bala sluice access bridges Gwynedd Appraisal 2022-2023
Llangefni flood risk management scheme Isle of Anglesey Appraisal 2024-2025
Nant Gwrach natural flood management scheme Neath Port Talbot Construction 2022-2023
Clog y Fran structural works Carmarthenshire Construction 2022-2023
Afon seiont hydraulic modelling Gwynedd Appraisal 2022-2023
Hydrometry and telemetry topographic surveys All Wales Appraisal 2022-2023
Trehafod access improvements  Rhondda Cynon Taf Construction 2023-2024

Severn Estuary access road repairs

Monmouthshire Construction 2022-2023
Monmouth outfall repairs Monmouthshire Construction 2022-2023
Magor Pill outfall repairs Monmouthshire Construction 2022-2023
St Pierre outfall repair Monmouthshire Construction 2022-2023
Cwm Clydach dam repairs Neath Port Talbot Project Closure 2023-2024
Bala flood risk and mapping study Gwynedd Appraisal 2022-2023
Glynneath Blockstone wall repair Neath Port Talbot Project Closure 2022-2023
Llandinam flood modelling Powys Appraisal 2022-2023
Afon cynon intergrated catchment model Rhondda Cynon Taf Appraisal 2022-2023
Bala reservoir - removal of shoal Gwynedd Construction 2022-2023
Peterstone reservoir desilt Cardiff Construction 2022-2023
Roath Brook flood scheme Cardiff Appraisal 2022-2023
Chapel Reen outfall repairs Newport Construction 2023-2024
Bodfari gauging station Denbighshire Construction 2022-2023
Bedwas flood embankment Caerphilly Construction 2022-2023
Lancers Way bank repairs Newport Construction 2022-2023
Wentlooge sea defence repairs Newport Construction 2022-2023
Windmill reen outfall repairs Newport Construction 2022-2023
Coldharbour outfall repairs Newport Construction 2022-2023
Lower Taff flood modelling South Wales Appraisal 2022-2023
Glasfryn ford gauging station refurbishment Carmarthenshire Construction 2022-2023
Pwll vegetation management and temporary bund Carmarthenshire Construction 2022-2023
Roath brook survey Cardiff Appraisal 2022-2023
Crofty mill house flood bank Swansea Construction 2022-2023
Glasbury flood scheme - remedial repairs Powys Construction 2022-2023
Gelli embankment and deshoal Rhondda Cynon Taf Construction 2022-2023
Greenfield Marsh tidal embankment Flintshire Appraisal 2022-2023
NW embankment crest level surveys Gwynedd Appraisal 2022-2023
Machen flood schemes (phase 2) Caerphilly Construction 2022-2023
Pontypridd flood wall repairs Rhondda Cynon Taf Construction 2022-2023
Pontygwindy access improvements Caerphilly Construction 2022-2023
West Pill outfall improvement Monmouthshire Construction 2022-2023
Treforest maintenance works Rhondda Cynon Taf Construction 2022-2023
North west culvert inspection programme Gwynedd Appraisal 2022-2023
Bedwas access improvements Caerphilly Construction 2022-2023
Colchester avenue embankment and bermregrade Cardiff Construction 2022-2023
Riverside caravan park floodbank repair Abertawe - Swansea Project Closure 2022-2023
Review of existing standard of protection All Wales Appraisal 2022-2023
Tawe flood forecasting model improvements Swansea Appraisal 2022-2023
Bontnewydd floodwall structural survey Gwynedd Appraisal 2022-2023
Pwll flood risk management Carmarthenshire Project Closure 2022-2023
Frampton storage area - improvements for maintenance activities The Vale of Glamorgan Construction 2022-2023
Glynneath expansion joint replacement Neath Port Talbot Construction 2022-2023
Ynysybwl model update Rhondda Cynon Taf Appraisal 2022-2023
Tawelan Brook flood bund Carmarthenshire Construction 2022-2023
Bryncrug flood modelling Gwynedd Appraisal 2022-2023
Pont y Cerbyd reservoir safety work Pembrokeshire Construction 2022-2023
Rhymney flood modelling Caerphilly Appraisal 2022-2023
Dyffryn Conwy residual flooding issues Conwy Construction 2022-2023
Pontarddulais Dam Penstock automation Swansea Construction 2022-2023
Tondu road access track Bridgend Construction 2022-2023
Bangor-on-Dee scheme review Wrexham Appraisal 2022-2023
Pensarn flood modelling Conwy Appraisal 2022-2023
Pontyberem flood warning station improvements Carmarthenshire Construction 2022-2023
Afon Adda flood modelling Gwynedd Appraisal 2022-2023
Llangendeirne gauging station Carmarthenshire Project Closure 2022-2023
Lanelay Blockstone and access Rhondda Cynon Taf Construction 2022-2023
Resolven weir refurbishment Neath Port Talbot Project Closure 2022-2023
Fairbourne medium term management plan Gwynedd Appraisal 2022-2023
Talsarn Gabion basket replacement Ceredigion Project Closure 2022-2023
Disserth gauging station Powys Project Closure 2022-2023
Canaston bridge building refurbishment Pembrokeshire Project Closure 2022-2023
Esgair Carnau bank protection Powys Project Closure 2022-2023
St Asaph flood scheme Denbighshire Project Closure 2022-2023
Cadoxton Brook outfall South Wales Project Closure 2022-2023

Four stages of each project

There are four stages each project has to go through:

  1. Appraisal – we make sure the project is technically, environmentally and economically feasible and can go ahead
  2. Design - we look at the design in detail and refine the plans, costs and specifications, making sure that the natural environment is looked after and improved wherever possible.
  3. Construction - work is carried out 
  4. Project closure - construction is complete and outstanding costs are being paid

Each project has a forecast completion date. As with any major construction project, the forecast completion date can change because of the resources we have available, technical challenges, the conditions on site and changes to our prioritisation.

Funding

We spend around £17m a year on flood defence projects, prioritising communities most at risk. Our projects are largely funded by the Welsh Government.

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