A key priority for all large construction projects today

is care for the environment. That means carrying out

the works with the minimum of disruption to local

wildlife and vegetation whilst enhancing biodiversity

and reducing our carbon footprint.

Enironmental Impact Assessment (EIA)

This project requires the use of an Initial Environmental Appraisal which is used to analyse the possible impacts of a project on the local environment. This document outlines the ecological limitations such as; local wildlife and vegetation using the local environmental records centre ‘Cofnod’, and both the local and national designated sites such as Special Area of Conservation (SAC), Special Protection Area (SPA), Site of Special Scientific Interest (SSSI), Tree Preservation Order (TPO), Areas of Outstanding Natural Beauty (AONB) and Ancient Semi Natural Woodland (ASNW). It also outlines other environmental limitations such as; cultural heritage designations like listed buildings, scheduled ancient monuments, heritage sites, and Landscapes of Outstanding Historic Interest, watercourses, geology, and communities. These environmental limitations and considerations can then be used to better inform the decision of options within the scheme proposal.

Air Quality

Construction activities are likely to generate dust and vehicle emissions, and therefore appropriate measures will be implemented to reduce these emissions, ensuring disruption to residents and wildlife are kept to a minimum. No significant air quality impacts are considered likely due to the nature and scale of the proposals. However, construction generated dust and other aerial emissions could result in temporary nuisance during the construction phase. Mitigation measures should be implemented during periods of dry weather, particularly if works are in close proximity to residential properties or business premises.


The study area lies within two Landscapes of Outstanding Historic Interest (LOHI), Mawddach and Ardudwy. Consultation with Gwynedd Archaeological Planning Service (GAPS) will be required regarding potential impacts on the LOHI, and whether an Assessment of the Significance of Impacts of Development on Historic Landscape (ASIDOHL) and any archaeological assessment will be required.


An Initial Environmental Appraisal (IEA) has been prepared (see technical documents) which sets out the details of the ecological baseline and survey requirements, and provides details on what mitigation measures are needed to safeguard biodiversity. Key species considered are bats, otters, badgers, birds, reptiles and amphibians and aquatic life.


Materials expected to be required to construct the scheme include concrete, steel and masonry. Any masonry facing incorporated as part of the scheme should match existing masonry features within the locality, and be sourced from the closest suitable supplier where possible. Waste hierarchy principles will minimise waste, and materials will be re-used on site where possible. Any materials generated through construction activities should be incorporated in  to  the  scheme  if  possible.  All materials required to be  imported  should  be sourced as locally as possible to reduce travelling distances. Building   waste and excavated waste materials   should   be   disposed of in accordance with relevant waste regulations. Any contaminated   land/materials encountered need to be   dealt   with appropriately or removed to a suitably permitted facility. Similarly any excavated material  potentially contaminated  with  invasive  species  need  to  be  dealt  with appropriately in line with best practice.

Noise and vibration

The proposed construction work is likely to generate noise and vibration levels that are above the existing levels, causing a disturbance to residents. Increases in noise and vibration can also impact biodiversity in the surrounding area. Increases in noise and vibration levels are likely to be confined to the construction phase, and working hours, and are likely to return to normal on completion of the works. Whilst there may be increases in noise and vibration levels, it is not expected that these increases would be significant.

Barmouth flood alleviation scheme


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