eftaxiaskostas@gmail.com
+44 744 5035 645
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Manchester, United Kingdom
Kostas Eftaxias
Senior Wastewater Modeller
1D / 2D network modelling, model verification and optioneering for wastewater and urban drainage networks.
Modelling Lead of the following projects:
250
Davyhulme flow monitorsUnited UtilitiesFlow Survey Management & Model Verification
206
Plymouth flow monitorsSouthwest WaterFlow Survey Management & Model Verification
18
Thames Water projectsDevelopment Services · Modelling Lead
01 / Project portfolio
From survey to solution.
ArupCURRENT
Senior Wastewater Modeller (Contract)
April 2026 – Present
Manchester, United Kingdom
Current projects
Severn Trent Secondment
Treborth WWTW Final Design Modelling
Arcadis
Principal Wastewater Modeller (Contract)
May 2025 – April 2026
Manchester, United Kingdom
Southwest Water Storm Overflows Program
Plymouth Flow Survey
206flow monitors
- Modelling Lead of Plymouth Flow Survey Scoping and Management, Model Build and Verification (206 monitors).
- Automation of Interim Data Assessment using Python.
Heathfield STW
- Modelling of Primary Treatment Works Stream.
Exmouth
- Model Build, Verification and Optioneering.
Dittisham
- Optioneering.
Thames Water
Development Services Support
18modelling projects
- Modelling Lead for 18 Modelling Projects including: Model Build and Verification, Model Calibration, Flow Survey Scoping and Control, Model Updates, Detriment Analysis, Optioneering.
Stantec
Senior Wastewater Network Modeller
June 2024 – May 2025
Warrington, United Kingdom
United Utilities
Davyhulme Strategic Study
250flow monitors
- Modelling Lead of 250 monitors flow survey.
- Model Build and Verification.
- 5 weeks of site visits to assist installation.
AMP8 CSOs and Better Rivers Program
- Tintwistle & Middleton (Davyhulme): Asset Surveys, Model Updates and Model Calibration.
Arup
Urban Drainage Modeller
April 2022 – June 2024
Manchester, United Kingdom
DCWW (Welsh Water) AMP7 Framework
Denbigh TEN Scheme
- Modelling Lead of Model Build, Verification and Optioneering.
Bangor Beach Road Shellfish
- Detriment Analysis, Optioneering and Design Modelling.
Treborth WTW Optioneering
- Optioneering, Nature Based Solution Modelling (Reedbed).
Chester Catchment
- Model Verification and Strategic Optioneering.
FHO studies
- Jacksons Bay and Bretton.
Stantec
Wastewater Network Modeller
July 2016 – April 2022
Warrington, United Kingdom
United Utilities
AMP7 Water Quality Conversions
- Model conversions and WQ model updates.
- WQ Model Calibration against measured data.
SOAF / Bathing Waters
- EDM vs Model Spills comparison and Spills assessment.
- Surface Water Separation Assessment.
- CSO Performance Assessment.
Scottish Water
Flood Risk Heat Maps Phase 2
- Flood Risk Assessment, based on the water level in a sewer relative to a property and/or cellar level and on the water depth on the ground at properties.
- Joint probability assessment for ICS catchments, for combination of Urban and River worst case return periods.
- Automation of assessment and heatmap production using FME.
Southern Water
AMP6 DAP and PR19
- Wateringbury and Sittingbourne Catchments: Model Build and Verification.
- Needs assessment, Solution Providing, Optioneering.
- Model updates, Future design horizon updates.
- Flow survey scoping, on-site visits during installation.
United Utilities
2020 Model Updates
- Historical rainfall manipulation.
C.S. Consultants
Civil Engineer | Urban Drainage Modeller
October 2015 – July 2016
Athens, Greece
Stormwater & river modelling
Kareas – Ilioupoli storm network final design (2015–2016)
- Detail design of storm water network.
- Catchment hydrological calculations (Giandotti and Kiprich methods).
- Hydrological / Hydraulic calculations, Model Build and Optioneering.
Stalida river flooding zone assessment (2015–2016)
- Hydrological study, river catchment calculations.
- River Flood Zones Analysis.
- Model Build & Optioneering.
Agrinio’s rivers arrangement and drainage system design (2016)
- Catchment hydrological calculations.
- Rainfall calculations using Rainfall Hydrograph.
- Model build, Hydraulic calculations and Optioneering.
Bardakis Ioannis & Co.
Graduate Civil Engineer
October 2014 – June 2015
Athens, Greece
Civil engineering & surveying
Traffic volume assessment for “Ionia Odos” highway
- Managing a team of 14 people in two remote cities of Greece (Agrinio and Ioannina) that were undertaking traffic volume measurements for “Ionia Odos” (highway maintenance company).
- Site visit for equipment installation and training the team members.
- Collecting data from all the 14 surveyors and managing their shifts.
“Drama – Paranesti” railroad survey and mapping
- Railroad survey and mapping.
Urban survey and mapping in Ano Voula, Athens
- Urban survey and mapping covering an area of 3.6 km².
02 / Education
Engineering foundations.
National Technical University of Athens
MEng in Water Resources and Environmental Engineering
BSc in Civil Engineering
Thesis
“Modelling of coastal aquifers using FeFlow software”
Thesis grade9.5 / 10.00
Academic modules
- Fluid mechanics
- Applied hydraulics
- Hydrology for engineers
- Environmental engineering
- Urban drainage networks
- Free surface flow mechanics
- Coastal engineering
- WwTW engineering
- Groundwater flow
- Water resources engineering
- Wastewater engineering
- Hydraulic experiments
University GPA
6.71 / 10.00
National Technical University of Athens
1st General Lyceum of Zografou
High School Certificate
September 2001 – July 2004
Athens, Greece
GPA: 18.98 / 20.00
03 / Professional experience
Career.
April 2026 – Present
ArupCURRENT
Senior Wastewater Modeller (Contract)
Manchester, United Kingdom
May 2025 – April 2026
Arcadis
Principal Wastewater Modeller (Contract)
Manchester, United Kingdom
June 2024 – May 2025
Stantec
Senior Wastewater Network Modeller
Warrington, United Kingdom
April 2022 – June 2024
Arup
Urban Drainage Modeller
Manchester, United Kingdom
July 2016 – April 2022
Stantec
Wastewater Network Modeller
Warrington, United Kingdom
October 2015 – July 2016
C.S. Consultants
Civil Engineer | Urban Drainage Modeller
Athens, Greece
October 2014 – June 2015
Bardakis Ioannis & Co.
Graduate Civil Engineer
Athens, Greece
July – August 2005 and 2006
Hellenic Ministry for the Environment and Public Works
University Summer Placement as Trainee Civil Engineer
Athens, Greece
2-month placements in the Hellenic Ministry of Environment, Planning and Public Works.
04 / Skills & software specialisation
Technical expertise.
- 1D / 2D Network Modelling
- Model Build and Verification
- Wastewater Treatment Works Modelling
- Flow Survey Scoping, Management and Data Assessment
- Flood Risk Assessment
- Flood Risk Heat Mapping
- Final Design Modelling
- Model updates
- Optioneering
- Solution Providing
- Nature Based Solutions Modelling
- Automations
Engineering software
- ICM InfoWorks v2026
- MapInfo
- ArcGIS
- qGIS
- Global Mapper
- FME Data Analysis
- PowerBI
- AutoCAD
- EPAnet
- EPA SWMM 5.0
- DHI Mike
- FeFlow
- HEC-RAS
- HEC-HMS
Scripting · Coding
- Python
- Ruby
- Visual Basic 6.0
- Excel Macros scripting
- Fortran
Office suites · General computer knowledge
Advanced computer knowledge in hardware, software and networks
Microsoft Office Suite (Word, Excel, Power Point, Access, Outlook, Project, Teams)
Windows, Linux OS
LLM and AI Applications in projects
05 / Memberships
Professional credentials.
Chartered membership
Chartered Civil Engineer with TEE
Technical Chamber of Greece
September 2014 – Present
Greece
Professional membership
Member of CIWEM
April 2017 – Present
United Kingdom
06 / Right to Work
Right to work in the UK.
Settlement status
Settled Status
Permanent Right to Live and Work in the UK