Technical requirements

Information to help you understand our requirements where it is not possible to work outside the Prescribed Proximities of our assets.

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Where it is not possible to work outside the Prescribed Proximities of our assets, we may identify specific requirements that apply to your work.

Review Section 8 of our guidelines to find out about our technical requirements for different types of work.

Please read and understand all sections of the guideline that apply to your work – there may be more than one section that is relevant.

The ground cover (depth from ground level to top of pipe) over buried assets provides support and protection from excessive loads and damage.

The table below provides a guide to our minimum cover requirements for different types of assets depending on their location.

 Type of asset Location Minimum cover 
Trunk and distribution water mains Road reserves, car parks and other trafficable areas 750 mm 
Parklands, private property and other non-trafficable areas  600 mm
Water reticulation Road reserves, car parks and other trafficable areas 600 mm
Parklands, private property and other non-trafficable areas 600 mm
Sewer reticulation and sewer mains Road reserves, car parks and other trafficable areas 900 mm 
Parklands, private property and other non-trafficable areas  750 mm 
Sewer and drainage pressure mains Freeways and other primary distributor roads  900 mm 
Other trafficable areas as well as parklands, private property and other non-trafficable areas  900 mm 
Main drains Road reserves, car parks and other trafficable areas 900 mm 
Parklands private property and other non-trafficable areas  750 mm 

Maintaining adequate clearance distances to other services is essential to ensure adequate access for future maintenance, repairs or replacement. Some of our requirements for access include:

  • an access way of at least 1.0m wide is to be maintained around the edge of sewer and drain maintenance structures at all times
  • a headroom of at least 2.4m is to be maintained at all times between ground level and the underside of an overhanging structure such as a roof.

Where other underground services (such as gas mains, power cables, telecommunication cables) cross our assets, the following clearances shall apply:

Diameter of our asset Minimum clearance for services installed by open excavation Minimum clearance for service crossings installed by trenchless excavation 
 Less than 300mm  At least 150 mm At least 150 mm + equipment accuracy (mm) 
 300 mm or greater At least 300 mm  At least 300 mm + equipment accuracy (mm)

All services should cross at, or close to right angles to our assets.


More information 

If you need further advice on how to apply the requirements, or if you need additional information not covered in the guidelines, please email us at pos_enquiries@watercorporation.com.au.

Find out more

Working near our assets?

Refer to our technical guidelines
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