KOSTAS EFTAXIAS

Principal Wastewater Modeller
1D/2D Network Modelling Flood Risk Assessment Flow Survey Management Optioneering Python & AI Automations Treatment Works Modelling Nature Based Solutions GIS & FME 10+ Years Experience
Manchester, United Kingdom
+44 744 5035 645
eftaxias.uk
linkedin.com/in/eftaxiaskostas
Settled Status — Right to Work in UK

Core Skills

01
1D / 2D Network Modelling
Model Build & Verification
Flow Survey Scoping & Management
Flow Survey Data Assessment
Flood Risk Assessment
Nature Based Solutions
Final Design Modelling
Optioneering & Solution Providing
Treatment Works Modelling
Model Updates & Calibration
Python & AI Automations
Storm Overflow Analysis

Professional Experience

02
Arcadis
Principal Wastewater Modeller (Contract)
May 2025 – Present
Manchester, UK
Southwest Water — Treatment Works Modelling Program
  • Plymouth Strategic Model Update: Modelling Lead of Plymouth Flow Survey Scoping and Management, Model Build and Verification (206 monitors). Automation of Interim Data Assessment (Volume Balance Assessment and Rainfall Assessment) using Python
  • Heathfield STW — Modelling of Primary Treatment Works Stream
  • Maer Lane STW - Exmouth Catchment: Model Updates, Model Verification (18 monitors), Design Horizon Updates, Optioneering
  • Dittisham STW: Optioneering and Infiltration Assessment
Thames Water — Development Services Support
  • 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 Urban Drainage Modeller
June 2024 – May 2025
Warrington, UK
United Utilities
  • Davyhulme Strategic Study: Modelling Lead of 250 monitors flow survey (Flow Survey and Asset survey Scoping, Pre-installation site visits, Flow Survey control). 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, UK
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, Bretton
Stantec
Urban Drainage Modeller
July 2016 – April 2022
Warrington, UK
United Utilities AMP7 Framework
  • AMP7 Water Quality Conversions: Model conversions, WQ model updates, and calibration.
  • SOAF / Bathing Waters: EDM data collection, spills assessment, CSO performance assessment.
Scottish Water — Flood Risk Heat Maps Phase 2
  • Flood Risk Heat Maps Phase 2: Flood Risk Assessment, Joint probability assessment for more than 100 catchments in Scottish Water Region.
  • 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 on installation
United Utilities — 2020 Model Updates
  • Historical rainfall manipulation
ICM Representative for the Warrington office in the ICM Europe & India Group (Dec 2016 – Apr 2022). Managed simulation resource distribution, troubleshooting and inter-office communication.
C.S. Consultants
Civil Engineer, Hydraulic Modeller
Oct 2015 – July 2016
Athens, Greece
Kareas – Ilioupoli Storm Network Final Design (2015–2016) (link)
  • 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 and river catchment calculations
  • River Flood Zones Analysis
  • Model Build & Optioneering
Agrinio Rivers Arrangement & Drainage System Design (2016)
  • Catchment hydrological calculations
  • Rainfall calculations using Rainfall Hydrograph
  • Model build, Hydraulic calculations and Optioneering
Bardakis Ioannis & Co.
Graduate Civil Engineer
Oct 2014 – June 2015
Athens, Greece
Traffic Volume Assessment — "Ionia Odos" Highway
  • Managed a team of 14 across two remote cities (Agrinio and Ioannina) undertaking traffic volume measurements for the highway maintenance company
  • Site visits for equipment installation and training of team members
  • Collecting data from all 14 surveyors and managing their shifts
"Drama – Paranesti" Railroad Survey & Mapping
  • Survey and mapping works for the railroad project
Urban Survey & Mapping — Ano Voula, Athens
  • Urban survey and mapping covering an area of 3.6 km²
Hellenic Ministry for the Environment
Trainee Civil Engineer — University Summer Placement
Jul–Aug 2005 & 2006
Athens, Greece
Ministry for the Environment, Planning and Public Works
  • Two 2-month placements during university studies, becoming familiar with several kinds of engineering studies
  • Road Works construction preliminary studies
  • Road Work Environmental Impact studies

Education

03
National Technical University of Athens
Oct 2004 – Feb 2014 · Athens, Greece
MEng in Water Resources & Environmental Engineering
BSc in Civil Engineering
GPA: 6.71 / 10.00
Thesis: "Modelling of coastal aquifers using FeFlow software" — Grade 9.5/10.00

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
1st General Lyceum of Zografou
Sep 2001 – Jul 2004 · Athens, Greece
High School Certificate
GPA: 18.98 / 20.00

Software & Tools

04
Engineering Software
ICM InfoWorks v2026 HEC-RAS EPA SWMM 5.0 EPAnet DHI Mike FeFlow HEC-HMS ArcGIS qGIS MapInfo Global Mapper FME Data Analysis AutoCAD PowerBI
Scripting & Coding
Python Ruby Excel Macros Visual Basic 6.0 Fortran
Office & General
Microsoft Office Suite Windows Linux LLM / AI Tools

Memberships

05
CIW
EM
Member of CIWEM
Chartered Institution of Water and Environmental Management
April 2017 – Present · United Kingdom
TEE
Chartered Member of TEE
Technical Chamber of Greece
September 2014 – Present · Greece

Settlement Status

06
UK
Permanent Settled Status
Right to Live and Work in the United Kingdom
Granted · United Kingdom

Tweaks