JMG’s Hydraulics team provide full service engineering capabilities across the common areas of hot & cold water, sanitary drainage, sewer and stormwater and wastewater design.

The team also offer specialist expertise in the following areas:

  •  Sanitary drainage and water reticulation

  • Central hot water plant

  • On-site sewerage systems

  • Trade waste

  • Hydronic Heating and solar systems

  • Gas and medical gas reticulation

Grant Atherton
Principal – Civil, Structural, Hydraulics

Grant heads the Construction and Industry division by overseeing technical quality throughout a multitude of simultaneous projects.

With over thirty years of experience in civil and structural engineering, Grant has industry leading skills which includes design, contract administration, project management and construction supervision.  His expertise includes roads, bridges, railways, planning, reservoirs, pipelines, pump stations, water and waste water treatment, precast concrete, subdivisions, industrial and commercial works.

Significant projects Grant has worked on include the Abt Railway, Cambridge Park and the South East Irrigation Scheme.

Grant is the primary contact for any civil, structural and hydraulics enquiries and oversees all related projects. Contact him at:

Adam Johnston
Principal Technical Officer – Hydraulics

As head of the Hydraulics division Adam and his team design industry leading Hydraulic and Fire Protection services. Prior to working as a hydraulic designer for the last 10 years, Adam worked as a plumbing, drainage and gas fitting contractor. This technical experience gives Adam extensive knowledge of hydraulic systems including:

  • sewer
  • sanitary
  • stormwater
  • reticulation
  • wet fire services

Significant projects Adam has worked on include the Royal Hobart Hospital Redevelopment, ICON (Myer redevelopment) and Parliament Square.

Adam is the primary contact for building hydraulics enquiries and oversees all related projects. Contact him at:

Feature Projects