Principal Wastewater (Hydraulic) Modeller

Tetra Tech, Inc.; Greater London; Hybrid; GBP 60,000 - 80,000; Full time

Job summary

Tetra Tech Europe is searching for a Principal Wastewater Modeller to guide technical delivery across the AMP8 and AMP9 wastewater programs. The successful candidate will define strategies and oversee modelling standards while leading multidisciplinary teams to innovate in water management.

This role offers opportunities for strategic influence over national modelling standards and requires proven expertise in hydraulic modelling tools like InfoWorks ICM.

Flexible hybrid working arrangements are available to support collaboration and focused technical work.

Qualifications

• Proven expertise in hydraulic modelling and model development.
• Experience delivering compliant modelling outputs with HSE governance.
• Ability to manage forecasting and commercial risk in projects.

Responsibilities

• Lead technical delivery of wastewater projects.
• Oversee modelling standards and manage commercial performance.
• Mentor and build high-performing teams across multiple projects.

Skills

Hydraulic modelling leadership

Technical assurance & governance

Commercial and programme performance

Team leadership & client engagement

Digital innovation & data fluency

Education

Degree in a relevant technical discipline

Postgraduate qualification desirable

Chartered status or working towards chartership

Tools

InfoWorks ICM

GIS

Python

FME

Power BI

Job description

Lead nationwide modelling that protects communities

Purpose And Scope Of The Role

Tetra Tech’s Water Consultancy is seeking a Principal Wastewater Modeller to lead technical delivery and team development across AMP8 and AMP9 wastewater programmes. You will define catchment strategies, lead hydraulic modelling and design inputs from feasibility through to detailed design, and take responsibility for HSE, quality and governance on multi‑million‑pound projects. Day‑to‑day you will oversee modelling standards, manage commercial performance and risk, develop bids and proposals, and represent the business to clients and delivery partners across London, Leeds, Newcastle, Sheffield, Derby, and Warrington.

Your Impact In This Position

Immediately you will raise modelling assurance and guide complex catchment interventions. Over the medium term you will build and mentor high‑performing modelling teams, embed improved workflows and influence investment decisions that reduce pollution and flood risk. Longer term the role offers strategic influence over national modelling standards, the opportunity to innovate with digital tools and the chance to shape low‑carbon, resilient solutions across major water company frameworks.

Core Capabilities

• Hydraulic modelling leadership - Proven expertise in InfoWorks ICM, model development, calibration and deriving robust catchment strategies.
• Technical assurance & governance - Deliver auditable, compliant modelling outputs and maintain rigorous quality and HSE governance across projects.
• Commercial and programme performance - Manage forecasting, commercial risk, resource planning and contribute to bid and proposal development.
• Team leadership & client engagement - Lead, mentor and grow multidisciplinary teams; present complex findings clearly to clients and stakeholders.
• Digital innovation & data fluency - Drive continuous improvement using GIS, Python, FME, Power BI or similar tools to automate workflows and enhance evidence‑based decision making.

Skills, Qualifications And Experience

Degree in a relevant technical discipline; postgraduate qualification desirable. Chartered status or working towards chartership and professional affiliation (CIWEM, ICE, IWater) preferred.

Work patterns & locations

Hybrid working across regional offices with regular client and site visits; flexible arrangements supported to balance collaboration and focused technical work.

In alignment with the Equality Act 2010, we will make reasonable adjustments to support candidates and employees requiring additional arrangements. This could include adaptations to work schedules, training approaches, or the physical workspace. Please inform us if you need any accommodations during the recruitment process or in your day‑to‑day role.