> Markdown version of [/jobs/ext/3678089-senior-principal-drainage-infrastructure-engineer-cardiff](https://www.wearedevelopers.com/jobs/ext/3678089-senior-principal-drainage-infrastructure-engineer-cardiff). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Senior / Principal Drainage Infrastructure Engineer - Cardiff

- **Company:** Serply Recruitment
- **Location:** Cardiff, UK
- **Experience:** Expert
- **Salary:** £50,000.0 - £57,000.0
- **Contract:** Permanent contract
- **Skills:** AutoCAD, Autodesk Autocad, SAB
- **Published:** October 11, 2026
- **Apply:** https://www.adzuna.co.uk/jobs/details/5923032931

## About the Role

* 7+ years' experience in surface and foul water design and/or construction
 * Strong knowledge of Sewers for Adoption and Design Manual for Roads and Bridges
 * Degree in Civil Engineering (Masters preferred)
 * Chartered status with ICE or CIWEM (or close to completion)
 * Proficient in:

 * MicroDrainage
 * InfoDrainage
 * AutoCAD
 * Civils 3D
 * Autodesk ICM

Experience with:

 * S104 and S106 approval processes
 * SuDS Approval Body (SAB) approvals
 * National Planning Policy and flood risk management

Demonstrable leadership and team management capability Strong written and verbal communication skills Ability to work independently and collaboratively Proactive and methodical problem-solving approach BENEFITS

## Description

* Responsible to Senior Leadership Team / Associate Director
 * Purpose of the role To support and help lead the delivery of civil engineering drainage design across a diverse portfolio of infrastructure projects, with a focus on SuDS and surface water management.
 * Client brief Our client is a well-established, multi-disciplinary engineering consultancy seeking to grow their Cardiff team with a technically strong and forward-thinking drainage engineer who can contribute to both project delivery and team development., * Assist in leading the delivery of civil engineering design across infrastructure projects
 * Lead surface water and foul water drainage strategies and detailed designs
 * Deliver SuDS and conventional drainage solutions
 * Manage multiple concurrent projects and prioritise deliverables
 * Provide technical support and assist with resource planning
 * Support, mentor and develop junior engineers
 * Liaise with statutory bodies including Natural Resources Wales and the Environment Agency
 * Manage Water Authority approval processes (S104, S106, etc.)
 * Build and maintain strong client and stakeholder relationships