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Assistant Wastewater Network Modeller

Job in Cardiff, Cardiff City Area, CF10, Wales, UK
Listing for: Mott MacDonald Group
Full Time position
Listed on 2026-10-06
Job specializations:
  • Engineering
    Water Engineer, Environmental Engineer, Water Management
Salary/Wage Range or Industry Benchmark: 45000 - 65000 GBP Yearly GBP 45000.00 65000.00 YEAR
Job Description & How to Apply Below

Location/s:
Brighton, Reading, Bristol, Cardiff, Edinburgh; UK

Mott Mac Donald is a global engineering, management, and development consultancy with over 20,000 employees across more than 50 countries and 140+ offices.

We work across incredible global industries, delivering exciting work that is defining our future and making an important societal impact in the communities we serve. Our people power our performance – we succeed when they do. With countless opportunities to collaborate, learn, and grow, the possibilities for excellence are as varied as every individual.

Whether you want to grow as a subject matter expert or broaden your experience with roles across our international community, you’re surrounded by global specialists who want to combine their expertise and champion you to be your best. As a proudly employee-owned business, we benefit our clients, our communities, and each other, investing in creating the right space for everyone to feel empowered, included, and valued.

Whatever your ambition, Mott Mac Donald is where people come to be brilliant.

About the Division

The Water Utilities Division is Mott Mac Donald’s centre of excellence for responding to the UK and Ireland's water and wastewater challenges. The work we do is at the forefront of ensuring safe water supplies for future generations, preventing urban flooding, and improving the health of our rivers and coastal environments. Our multi-disciplinary teams provide a variety of services throughout the full project life cycle, from advisory services and feasibility studies to outline and detailed design.

Together, we deliver best-in-class solutions to our clients while offering diverse and technically stimulating opportunities to our people.

Overview of the role

Come and join our UK & Europe-wide Wastewater Network Modelling Team, delivering some of the water industry's most challenging and high-profile projects for clients including Dŵr Cymru Welsh Water, Southern Water, Thames Water, Uisce Éireann, United Utilities and Wessex Water. Our team is at the forefront of digital innovation, using industry-standard tools such as Info Works ICM, GIS and FME, together with bespoke automation solutions, to improve efficiency and deliver better outcomes for our clients.

You will work alongside experienced technical specialists and project leaders on nationally significant programmes covering wastewater network modelling, water quality modelling, storm overflow reduction, Drainage and Wastewater Management Plans (DWMPs), network resilience and environmental improvement schemes. Through this work, you'll help shape more sustainable, climate-resilient water infrastructure and support improvements to river and bathing water quality. Whether working on standalone modelling studies or as part of a multidisciplinary team, you'll have the opportunity to develop your career while contributing to projects that deliver meaningful environmental and societal benefits.

Key Responsibilities and duties include:
  • Undertake model build and calibration/verification of catchment models in Info Works ICM
  • Model options to resolve sewer flooding and sewer overflow needs in Info Works ICM
  • Use GIS package to extract relevant data for the above activities and to create basic drawings to scope surveys required for Model Build and Flow Monitoring
  • Review survey data for completeness and consistency
  • Prepare emails, reports and presentations
Candidate specification

Essential:
  • Qualified candidates should have a good working knowledge of Info Works ICM and GIS packages
  • Relevant degree qualified
  • Experience working on Wastewater Networks Projects
  • Proficient in Microsoft Word, Excel and Power Point
  • Good communicator and able to enter into technical discussions in a logical and…
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