Principal Water Quality Modeller

Start here. Grow here.

Are you ready to join a team of water quality modelling specialists and shape the future of the Water Industry

Join our dynamic and multidisciplinary Water Team as a Principal Flood Modeller in one of our UK offices whilst also taking advantage of our flexible hybrid working model. You will be a senior technical resource that will guide our more junior staff and proactively aim to develop our offering to mainly the Environment Agency and private sector clients. 

As a Principal Water Quality Modeller in our Water team most of your role will be a senior technical resource who will lead exciting and challenging water quality assessments in rivers and lakes and also in transitional and coastal waterbodies. You will act as technical lead on a range of exciting and challenging water quality projects collaborating with hydrologists network modellers and engineers. You will lead the development of tools that will enable us to deliver efficiencies and innovative solutions for our clients. You will guide our more junior staff leaving a lasting legacy on the environment. You will be leading bids and using your knowledge of the industry to guide our strategy and within this space to enhance our offering to water utilities as well as industrial developments and local authorities. 

Principal accountabilities:

• Building and checking water quality models (using packages to such as MIKE MIKE21/3 HD/AD/Ecolab InfoWorks ICM CORMIX SAGIS-SIMCAT) to assist in UPM studies permitting studies and EIAs.
• Conceptualisation and scoping of modelling approaches with consideration of the risks and opportunities in each.
• Produce and review of high-quality technical reports documenting model build and uncertainties in the model build process
• Lead and input into tenders ranging from innovative one-off projects to multimillion pound framework contracts.
• Mentor staff within the team to support their professional development
• Build relationships with clients and across other technical disciplines
• Keep up-to-date with developments in legislation and guidelines that may affect our services
• Use AECOMs project management systems to deliver high-quality outputs to our clients in line with the agreed programme and budget
• Work closely with our clients and teams of engineers and technical specialists to help our clients deliver a wide range of fluvial and coastal surface water quality projects.

If youre passionate about innovation and turning bold ideas into reality we want to hear from you! Why not give our AECOM Water page on LinkedIn a follow to stay updated on the impactful projects were working on and see firsthand the difference were making in the industry!  

Come grow with us.

Become part of our dynamic Water business which boasts around 600 experts across the UK & Ireland. Collaborate with top-tier engineers and consultants to deliver a variety of captivating projects from small initiatives to large-scale ventures all the way from concept to completion. 

Youll thrive in an inclusive forward-thinking environment where your contributions are valued - and lets not forget about the perks! Youll enjoy a range of core and personalised benefits designed to support your future and well-being customised to fit your lifestyle. Take advantage of career development opportunities technical practice networks AECOM University volunteering days and our flexible hybrid working model to ensure a work-life balance that suits your lifestyle. We recognise that everyones circumstances are different so were happy to discuss part-time or flexible working arrangements that suit you

Why Join Us:

• Be part of a dynamic team that tackles challenging and impactful water projects.
• Work alongside industry-leading professionals and thought leaders.
• Engage in a collaborative and inclusive work environment.
• Access to continuous learning and development opportunities.
• Competitive salary and comprehensive benefits package.
• Enjoy the flexibility to work in a way that fits your lifestyle while supporting a healthy worklife balance.

Qualifications :

Ready to push the limits of whats possible

Heres what were looking for:

• Significant experience in fluvial and/or coastal water quality modelling software (MIKE MIKE21/3 HD/AD/Ecolab SAGIS-SIMCAT CORMIX)
• Experience of model build for UPM studies
• Demonstrable knowledge of Environment Agency requirements for UPM or WINEP studies.
• Understanding of hydrological assessments using FEH and REFH2
• Experience completing mass balance calculations including simple flow-weighted and Monte Carlo statistical approaches.
• Strong GIS skills using QGIS ArcGIS and / or MapInfo.
• Practical knowledge of scripting programmes such as Python Anaconda R would be advantageous
• Strong communication skills both written and verbal
• Masters degree (or equivalent) in Hydrology Engineering or other relevant discipline
• Obtained or near to obtaining professional qualification with CIWEM or similar.
• Excellent technical report writing skills.

You will also be self-motivated with an ability to work both autonomously where required with a strong sense of commitment a willingness to learn and a desire to work in a dynamic deadline driven team environment.

At AECOM we believe in creating a better world through innovative and sustainable solutions. If you share our vision and are ready to make a difference in the water industry we want to hear from you.

Additional Information :

Application Support

We celebrate diversity including neurodiversity and believe it enriches our team. We welcome applications from all backgrounds and abilities. If you are an applicant with a disability that requires reasonable accommodation to complete the application process please contact us at At AECOM we value everyones unique contributions and perspectives.

If you meet some of the requirements above or have transferable skills you believe would benefit us we would be delighted to hear from you!

Additional Information

Want to find out more about the role or what working at AECOM is like

You can learn more about us here: Candidate Brochure 

Or why not connect directly with our recruiter on LinkedIn to unlock insights and take the next step towards your dream career!

Click here to connect with the Recruiter via LinkedIn

Alternatively you can email the recruiter at or register your interest here and well keep you updated on our latest opportunities. 

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About AECOM

AECOM is the worlds trusted infrastructure consulting firm delivering professional services throughout the project lifecycle from advisory planning design and engineering to program and construction management. On projects spanning transportation buildings water new energy and the environment our public- and private-sector clients trust us to solve their most complex challenges. Our teams are driven by a common purpose to deliver a better world through our unrivaled technical and digital expertise a culture of equity diversity and inclusion and a commitment to environmental social and governance priorities. AECOM is a Fortune 500 firm and its Professional Services business had revenue of $16.1 billion in fiscal year 2025. See how we are delivering sustainable legacies for generations to come at and @AECOM.

Freedom to Grow in a World of Opportunity 

You will have the flexibility you need to do your best work with hybrid work options. Whether youre working from an AECOM office remote location or at a client site you will be working in a dynamic environment where your integrity entrepreneurial spirit and pioneering mindset are championed.

You will help us foster a safe and respectful workplace where we invite everyone to bring their whole selves to work using their unique talents backgrounds and expertise to create transformational outcomes for our clients.

AECOM provides a wide array of compensation benefits and well-being programs to meet the diverse needs of our employees and their families. Were the worlds trusted global infrastructure firm and were in this together your growth and success are ours too.

Join us and youll get all the benefits of being a part of a global publicly traded firm access to industry-leading technology and thinking and transformational work with big impact and work flexibility. As an Equal Opportunity Employer we believe in each persons potential and well help you reach yours.

We are a Disability Confident Employer and will offer an interview to applicants who have a disability or long-term condition who meet the minimum/essential criteria for the role. Please let us know using this email address   if you would like to apply through the Disability Confident Interview Scheme.

All your information will be kept confidential according to EEO guidelines.

Remote Work :

No

Employment Type :

Full-time