Perth Gateway WA – Design groundwater level determination

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Main Roads Western Australia engaged GHD to advise on the Perth Gateway WA – Design Groundwater Level determination.

The Gateway WA Project included a major upgrade of road infrastructure in the area around Perth Airport. Due to a relatively shallow depth to groundwater within the project area, development of a project-wide design groundwater level was key in allowing the design and specification of pavement structures and several large bath structures that required dewatering.

The approach in defining design groundwater levels for road design purposes involved achieving a balance between high additional costs associated with conservatism in prediction of high groundwater levels and the risk that these groundwater levels would be exceeded.

GHD identified various areas where groundwater level data was lacking, and developed a groundwater monitoring network to provide project wide groundwater level data. An algorithm was developed to allow the calculation of historic maximum groundwater levels for those areas where historic data was lacking.

A final design groundwater level surface was developed and incorporated into the infrastructure design. This allowed road planning and design to be completed with confidence that the infrastructure would not be impacted by groundwater, and that construction costs were minimized through prevention of excessive ground-filling.

Geology

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GHD's Geology team applies geological principles to the civil engineering, and mining and resources development industries. We work with our clients to deliver tailored solutions that optimise the negotiation of prevailing geological conditions, with the aim of minimising project cost and risk.

Our geological services are fully integrated with the diverse skills base across the GHD network. As an international professional services provider, we deliver the following geology services:

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Hydrogeology

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With you, our hydrogeologists work alongside our engineers, environmental consultants, planners, surveyors and GIS consultants to arrive at integrated solutions.

GHD has global hydrogeological experience in groundwater resource assessment, aquifer storage and recovery (ASR), mine dewatering, aquifer depressurisation, groundwater management and environmental assessment, salinity, acid sulfate soils (ASS) and acid and metalliferous drainage (AMD).

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Pavement Engineering

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Your single most valuable asset is arguably the pavement system within your network. We understand that pavements are subjected to static and dynamic loads as well as exposure to the elements; only sound engineering judgment, informed by experienced and qualified staff, can provide cost concious and appropriate solutions to your pavement challenges.

We demonstrate an innovative, sustainable approach through our relationships with research centres of excellence at Delft (Holland) Wisconsin (USA) Stellenbosch (South Africa) Transit New Zealand UWA (Western Australia) and ARRB (Australia).

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