Environmental Engineering
Fiord Group
Water Resources · Hydrology · Flood Impact
Western Australia
Bridging the gap
between approvals and construction.
Hydrology and environmental engineering, focused on surface water — flood studies and modelling, river and creek diversions, hydraulic design, and mine water infrastructure for works approvals. Based in Denmark, Western Australia; servicing Albany and the Great Southern.
Time to construction is the number that matters. One calibrated model carries each project from first assessment through approvals to construction — no duplicated studies, no rebuilt evidence, no lost months.
Founded
2026
Principal
Blake Marxsen, MIEAust
Practice
Environmental engineering focused on surface water: river and creek diversions, flood resilience and hydraulic design — survey data to engineering sign-off, including approvals and compliance.
An engineering practice rooted in water. We model catchments, map flood behaviour and design the structures that manage both — data, design and sign-off under one roof, working closely with pilots, surveyors and civil engineers. From Pilbara mine sites to Gulf Coast LNG terminals, every study is built to hold: to the regulator, to the review panel, and to the flood itself.
Endorsements
Dedicated and relentless, bringing boundless positivity, enthusiasm and a 'can-do' mindset. A pleasure to work alongside.
Engineer · Iron ore producer
Hydrology expertise, and a key contribution to the project's drainage studies. Even remotely, communication was flawless.
Engineer · Global engineering group
Enthusiasm, a personable approach and dedication to the work — an invaluable asset.
Director · Engineering consultancy
Credentials
Engineers Australia — MIEAust
Member
BEng (Environmental), Honours
Murdoch University
Projects to US$26B capital value
WA · NT · QLD · NSW · International
Sectors
Mining & Resources
Iron ore, gold, copper, lithium — open cut, underground, tailings
Energy & LNG
Export terminals, hydrogen, solar
Infrastructure & Government
Councils, rail, land development
Agriculture & Land
Irrigation, drainage, farm water security
Environmental engineering, focused on surface water — river and creek diversions and flood resilience, carried through approvals to construction.
Services
River & Creek Diversions
Mine sites · Realignment
Hydraulic and geomorphic channel design, concept to construction
Flood Resilience of Infrastructure
Rail · Roads · Assets
Immunity assessments and protection works for critical assets
Flood Impact Assessment
1% AEP · Development
Assessments that hold up under EPA and council scrutiny
Flood Hydrology & Modelling
1D/2D modelling
Calibrated catchment and floodplain models, ARR16/19
Hydraulic Structure Design
Culverts · Levees · Basins
Concept through IFC drawings and engineering sign-off
Surface Water Management
Mine sites · Catchments
SWMPs, drainage design, sediment and erosion control
Hydrology for Approvals
EPA WA · Part IV
Part IV evidence, Inland Waters and Ministerial conditions
Water Design for Works Approvals
DWER Part V · Mine sites
Surface water design for DWER Part V works approvals
From Ground to Model
Survey data is distilled into calibrated models — terrain, rainfall and flow resolved into one defensible picture.
From Ground to Model
Every study starts with the ground as it actually is. LiDAR terrain, ground truthing and gauge records feed calibrated hydrologic and hydraulic models. Assumptions are documented, sensitivity is tested, and the model is built to be interrogated — by the reviewer, the regulator, and the next engineer who opens it.
Toolset
Industry-standard 1D/2D hydrologic, hydraulic and terrain modelling platforms — calibrated, documented and reviewed
Precision in Delivery
Reports, figures and drawings issued to engineering sign-off. Cartographic-grade flood mapping, clear exceedance tables, and recommendations a client can act on.
Selected Projects (8)
Delivered by the principal across prior roles and The Fiord Group.
Rail Yard Stormwater
Pilbara, WA
Gold Mine Expansion
Northern Territory
LNG Export Terminal
Louisiana, USA
Lithium Brine PFS
Salta, Argentina
Copper-Gold Feasibility
Sumbawa, Indonesia
Gold Mine TSF
Victoria
Urban Canal FRMS&P
Sydney, NSW
Regional Flood Assessments
Northern NSW
Defensible
by Design
Modelled, Mapped
& Signed
Practice
Built on evidence — every number traceable, every map defensible, nothing modelled twice.
2026 Year
of Foundation
Modelling, approvals and sign-off under one roof — working closely with pilots, surveyors and civil engineers.
No handover between consultancies, no remodelling, no second pass. Approved once, built from the same numbers.
What clients and colleagues say
Played a pivotal role in one of the world's largest LNG projects. The technical and communication skills were crucial to its success.
Gifted engineering, with exceptional problem-solving and communication skills, evident in the AI platform designed and built.
Outstanding technical skills and deep knowledge in environmental engineering and hydro-technical analysis, significantly enhancing the quality and depth of our dam break analysis.
Principal's delivery record — prior roles and The Fiord Group
9+
Years of technical consulting across water resources and environment
US$26B
Largest project as lead engineer — stormwater, drainage and hydraulic structures
40+
Major studies delivered across mining, energy, infrastructure and government
4
Continents — Australia, North America, South America and Asia-Pacific