Guidelines on residential drainage systems

Efficient residential drainage systems are essential for safeguarding properties against water damage and maintaining structural integrity. In this guide, we’ll explore key principles and best practices for designing, installing, and maintaining effective drainage systems tailored to residential settings. From understanding soil composition to implementing proper slope and runoff management, these guidelines aim to empower homeowners and professionals alike in mitigating water-related issues and ensuring the longevity of residential structures.


Australian standards

In Western Australia, drainage systems must adhere to relevant Australian standards and guidelines to ensure effective management of stormwater runoff and prevent issues such as erosion, subsidence, and flooding.

Some of the key standards and guidelines include:

  1.  AS/NZS 3500.3: Plumbing and Drainage

    Part 3: Stormwater Drainage: This Australian standard provides requirements and guidelines for the design, installation, and maintenance of stormwater drainage systems, including the sizing and layout of pipes, as well as the design of surface water drainage systems.

  2. AS 3798: Guidelines on Earthworks for Commercial and Residential Developments

    This standard offers guidance on earthworks, including drainage, for both commercial and residential developments. It covers aspects such as site preparation, grading, and drainage design to ensure the stability and functionality of the development.

  3. Local Government Regulations and Guidelines

    In addition to national standards, local governments in Western Australia may have their own regulations and guidelines pertaining to drainage systems. These may include requirements for stormwater management plans, drainage easements, and compliance with specific local conditions and constraints.

  4. Building Codes and Standards

    Various building codes and standards, such as the National Construction Code (NCC), contain provisions related to drainage systems and waterproofing requirements for buildings. Compliance with these codes is essential to ensure the structural integrity and safety of buildings.

  5. Water Corporation Guidelines

    The Water Corporation, which manages water supply and drainage infrastructure in Western Australia, may provide additional guidelines and requirements for drainage systems, particularly in urban areas served by public utilities.


Property owners, developers, and contractors involved in the design, installation, and maintenance of drainage systems in Western Australia should consult these standards and guidelines to ensure compliance and the effective management of stormwater runoff. Additionally, seeking guidance from local authorities and professional engineers can help ensure that drainage systems are designed and implemented to meet the specific needs and conditions of the site.

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