what we do

Hyd2o is a leading specialist consultancy providing personalised professional services in hydrology, drainage, and urban water management to urban and regional areas of Western Australia.  

Clients benefit from our technical expertise and strategic skills to simplify complex problems and approval processes, and achieve excellence in water management outcomes.


Surface Water Hydrology

Conceptual Design of Urban Stormwater Systems

Surface Water Modelling

Surface Water Resource Assessment

Flooding Management Studies and Strategy Development

Environmental Hydrology

Water Sensitive Urban Design

Wetland Assessments

Best Management Practice Design and Performance Monitoring

Pre and Post Development Monitoring Programs and Implementation

Water Quality Sampling and Data Analysis

Urban Water Management

Implementing Better Urban Water Management

District Water Management Strategies

Local Water Management Strategies

Urban Water Management Plans

Government Agency Approval Negotiations

Water Resource Planning and Management

Groundwater and Surface Water Resource Planning

Divertible and Sustainable Yield Estimation

Review of Existing Water Supply Scheme Performance

Groundwater Hydrology

Groundwater Mapping

Groundwater Monitoring Bore Installation

Infiltration Modeling

Licence Applications

Licence Compliance Reporting

who we are

Sasha Martens

Principal Engineering Hydrologist, B Eng (Civil Hons) MIEAust CP Eng

Sasha established Hyd2o as a specialist consultancy in 2011, and has over 30 years experience in engineering hydrology and water resources engineering, with particular expertise in surface water hydrology, flood management, and water resources planning.

He has extensive experience in both urban and regional areas having been involved in the development of water management strategies and policy across WA, and has established key relationships with state and local government. His experience in the application of Better Urban Water Management (2008) is considerable and applies not only to the strategic elements of the documentation, but also to delivering a strong engineering and environmental focus toward practical solutions for stormwater management.

Sasha is a former Chair of the Hydrology and Water Resources Panel of Engineers Australia WA Division on which he has been a contributing member over many years. He was also a member of the UDIA’s Urban Water Management Committee from 2011-2017.

Sean O’Sullivan

Engineering Hydrologist, B Eng (Env. Hons)

Sean is an Engineering Hydrologist who is continuously growing his skill base at Hyd2o. He graduated from Murdoch University in 2019, where he was a recipient of the Rose and Stan de Pierres Scholarship.

Sean became familiar with project research and design in the areas of environmental hydrology and urban water management during his studies, and completed his undergraduate experience at the Water Corporation where he managed a research and development project which ultimately formed the basis of this final year honours thesis.

Since joining the Hyd2o team, Sean has been involved in a wide range of development projects, undertaking field investigations, monitoring, groundwater mapping and data interpretation, stormwater modelling, and the analysis of hydrological data using GIS.

Brian (Sie Loong) Lau

Environmental Hydrologist, B Sc (Geographical Sciences)

Brian is an Environmental Hydrologist who has been with Hyd2o since August 2022. Graduating from the University of Western Australia with a Bachelor of Science degree in Geographical Sciences, his familiarity with spatial sciences and local geology has been useful particularly in areas of groundwater mapping, analysis of hydrological data using ArcGIS, and continues to show excellent proficiency with stormwater modelling (XP-STORM, PONDS) and data interpretation.

Prior to joining Hyd2o, Brian had been with Rio Tinto as part of an industry placement program where he conducted a groundwater quality assessment and management report for a staff accommodation area based around one of the Rio Tinto mining sites in the Pilbara region.

Brian continues to further his studies at the University of Western Australia, currently undertaking a Master of Hydrogeology.

Andre Righetti

Engineering Hydrologist/ Environmental Engineer

Andre is an Environmental Engineer who recently joined the Hyd2o team. He graduated from the Piracicaba School of Engineering in Brazil with an Environmental Engineering Honours degree in 2010 and post graduated in Environmental Management from the University of Sao Paulo (Brazil) in 2018.

In Australia since 2019, Andre has acquired further skills graduating at South Metropolitan TAFE (Certificate III in Conservation and Land Management) in 2021 and at North Metropolitan TAFE (Diploma in Environmental Monitoring and Technology) in 2022.

Andre has substantial experience in working for environmental consultancies and in Brazil held roles as a Senior Environmental Engineer and Environmental Department Coordinator.

At Hyd2o, he has been involved in monitoring activities, licence applications, design and modelling of hydrology projects and interpretation of data using GIS.