Technical Expertise

Multidisciplinary teams comprising of specialists across ten industry sectors, we have the expertise necessary to grapple with challenging assignments.

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Commitment to Clients

Our business is built on relationships, and our clients will always be our top priority.

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Featured Project

Silvertown Tunnel London UK

Silvertown Tunnel
One of the largest engineering projects in the world.

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Who We Are

International Award-Winning Engineering Consultants who deliver ground breaking solutions at the forefront of industry best practice.

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Our Regions

Carbon Reduction Plan

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Our Commitment to Net Zero
Ayesa is committed to becoming a net zero engineering consultancy by 2040

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Stay on top of the latest developments, appointments, awards and more across all our offices.

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Featured News

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On 19th October 2023, ByrneLooby will rebrand to Ayesa

ByrneLooby will officially adopt the name of its parent company, Ayesa, a global engineering and technology services provider.

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Investing In Our People

Cultivating a culture in which individual differences and the contributions of our staff are recognised and valued.

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Our EDI Policy

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Celebrating People
Fostering a culture where you are encouraged to be yourself.

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International Presence

Multidisciplinary team comprising of specialists across Ireland, UK and the Middle East.

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Catchment Area Planning & Hazard Mapping

Delivering Planning through Evidence-Based Approach

Catchment area planning is the recognition, assessment and management of flood risk at the river basin/catchment scale and is typically undertaken by government agencies, local councils and other authorities.  Assessment at the catchment scale takes a holistic approach, applying mitigation measures that address and reduce flood risk on a broader scale. Where “broad reach” measures are not possible, local area flood relief schemes can be implemented.  The Flood Directive (2007/60/EC), aims to protect vulnerable infrastructure but must be read in conjunction with the Water Framework Directive (2000/60/EC), which imposes a duty on member states to protect water quality. This is achieved by maintaining flood plains and restoring river basins.  These aims have been integrated into planning guidelines, and now, most national agencies in Europe typically undertake national level catchment-based flood risk assessment.  In Ireland, Ayesa work on behalf of the Office of Public Works (OPW) to provide hazard mapping services and modelling, an essential part of Ireland’s national Catchment Flood Risk Assessment and Management (CFRAM) study.

Catchment Area Planning uses an evidence-based approach for schemes informed by catchment risk assessments which detail:

  • Historical flood events
  • Rainfall records
  • High-resolution floodplain surveys
  • Detailed channel/structure surveys of selected rivers.

Our hydraulic models identify flood hazards (from river, sea, groundwater and rainfall) and flood risk (the resultant impact on people, the economy and the environment).  We have delivered multiple flood relief schemes in towns and villages across Ireland to meet the needs of the local area and county development plans including:

- Arklow Flood Relief Scheme
- Bandon Flood Relief Scheme
- Borrisokane flood surface water drainage
- Clontarf Flood Relief Scheme
- Ennis Flood Relief Scheme
- Glen Passage West Flood Defence Scheme
- Howth Flood Relief Scheme
- River Dargle Flood Relief Scheme
- River Barrow Flood Relief

Recently we have been appointed to deliver solutions for Buncrana, Ballybofey and Stranorlar, and Ramelton in County Donegal. 

Our value-based flooding solutions throughout the catchment are aligned with national policy and the natural ecosystems including:

  • Walkovers/surveys to identify opportunities and benefits
  • Stakeholder engagement and consulting and communication across a wide range of audiences
  • Stakeholder research and surveys
  • Detailed modelling and options assessments


Expertise In-Depth:

• Aerial /Lidar/ DTM surveys
• Area Planning
• Catchment area modelling
• Coastal modelling
• Contract administration
• Design of flood defence systems
• Early flood warning systems
• Ecological environmental risk mapping
• Environmental Impact (EI) & Appropriate Assessments (AA)
• Feasibility studies
• FCERM (Flood and Coastal Erosion Risk Management)
• Flood defence condition surveys
• Flood early warning systems
• Flood estimation
• Flood extent and hazard mapping
• Flood Relief Schemes (FRS)
• Flood resilience planning
• Flood Risk Assessment (FRA)
• Flood risk assessments & appraisal
• Flood risk management plans
• Flood risk management plans
• Flood risk/hazard mapping
• Funding submissions
• Ground Investigations and Surveys
• Hydraulic Modelling
• Hydrodynamic modelling & assessment
• Hydrological studies
• Natural flood risk management measures
• Pumping station assessment and development
• River modelling
• Stakeholder Engagement and Management
• Surface water modelling
• Topographical & bathymetric survey management


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