Victoria’s Stormwater Drainage Regulations: What You Need to Know

If you are a property owner or a builder in Victoria, it is crucial to understand the stormwater drainage regulations in the state. These regulations are in place to ensure that stormwater is collected and disposed of in a way that protects public health, safety, and the environment.

The Building Regulations 2018 outline the general requirements for stormwater drainage systems in Victoria. The regulations state that the appropriate disposal of stormwater is a shared responsibility between the property owner and the local municipal council. This means that property owners and builders must work with their local council to ensure that stormwater is disposed of in an appropriate manner.

When designing a stormwater drainage system, your plumber will consider various factors such as collection systems, storage options, treatment requirements, and distribution methods. It is important to note that the design of every stormwater drainage system to the point of discharge from an allotment must be approved by the relevant building surveyor. This ensures that the system is designed to meet the relevant standards and regulations.

Fundamentals of Stormwater Drainage

When it comes to building or renovating a property, stormwater drainage is an essential consideration. Proper stormwater drainage ensures that rainwater is efficiently collected and disposed of, preventing damage to your property and the surrounding environment. In Victoria, there are regulations in place to ensure that stormwater drainage systems are installed correctly and meet specific standards. In this section, we will discuss the its fundamentals and what you need to know to ensure compliance with Victoria’s regulations.

Stormwater Drainage System

A stormwater drainage system is a network of pipes, channels, and other structures that collect and transport rainwater from a property to a suitable discharge point. The system should be designed to handle the expected volume of water and prevent overflow or flooding. The local council is responsible for approving the design of the system and ensuring that it meets the relevant standards.

Pipes

Pipes are an essential component of a stormwater drainage system. They transport rainwater from the collection point to the discharge point. The pipes should be installed at the correct gradient to ensure that water flows smoothly and efficiently. It is essential to choose the right pipe material for your system, as different materials have different strengths and weaknesses. PVC pipes are a popular choice for stormwater drainage systems due to their durability and ease of installation.

Overflow

Overflow occurs when the volume of water exceeds the capacity of the stormwater drainage system. Overflow can cause damage to your property and the surrounding environment, so it is essential to design your system to prevent overflow. One way to prevent overflow is to install an overflow relief gully (ORG) in your system. The ORG acts as a safety valve, allowing excess water to escape before it causes damage.

Rainwater

Rainwater is the primary source of water for a stormwater drainage system. The system should be designed to collect rainwater efficiently and transport it to the discharge point. Rainwater can also be collected and reused for irrigation purposes, reducing your reliance on mains water.

Irrigation

Irrigation is the process of applying water to plants and crops to help them grow. A stormwater drainage system can be designed to collect rainwater and reuse it for irrigation purposes. This not only reduces your reliance on mains water but also helps to conserve water resources.

Construction and Installation

When it comes to stormwater drainage systems, there are several things to keep in mind during the construction and installation process. Here are some key factors to consider:

Building Requirements

Before starting any building work, it is important to obtain the necessary permits and approvals from your local council. In Victoria, Regulation 133(2) of the Plumbing Regulations 2018 requires that a report from the relevant council be obtained for a building permit where building work includes a stormwater drainage system. This report identifies the location of the legal point of discharge (LPOD) for the allotment.

Plumbing and Excavation

When installing a stormwater drainage system, it is important to hire a licensed plumber to ensure the work is done correctly. Excavation and trenching must also be done carefully to avoid damage to existing pipes and utilities.

Design and Planning

Proper design and planning are crucial for ensuring that a stormwater drainage system functions effectively and meets compliance requirements. This includes factors such as grading, surface water runoff, and compliance with AS/NZS 3500.3.

Complying with Regulations

All stormwater drainage systems must comply with relevant regulations and standards, including the Plumbing Regulations 2018 and the Building Act 1993. The Victorian Building Authority (VBA) regulates plumbing practitioners and plumbing work, and offers units of competency and Certificate II in Drainage.

Victoria’s Specific Regulations

In addition to national regulations and standards, Victoria has its own specific regulations related to stormwater drainage systems. These include the Water Act 1989 and the VBA’s Explanatory Information for Plumbing Regulations 2018.

Understanding Legal Points of Discharge

It is important to understand the legal point of discharge (LPOD) for your property, as this is the location where stormwater must be discharged. The LPOD is determined by the relevant council and is identified in the council report required for building permits.

Maintenance and Troubleshooting

Regular maintenance of stormwater drainage systems is important for preventing blockages and flooding. This includes ensuring downpipes and gutters are clear of debris, and regularly checking for blockages and pollutants. If issues arise, it is important to troubleshoot and address them promptly to prevent loss of amenity and damage to property.

Environmental Considerations

When designing and installing a stormwater drainage system, it is important to consider environmental factors such as rainfall events and the impact of runoff on surrounding areas. The use of greywater and garden watering can also help reduce demand on the system.

Additional Information

For more information on stormwater drainage regulations in Victoria, consult the VBA’s website and the relevant regulations and standards. It is also important to work with a qualified and experienced plumber and building surveyor to ensure compliance with all requirements.

Frequently Asked Questions

What is the minimum fall required for stormwater pipes in Victoria?

In Victoria, the minimum fall required for stormwater pipes is 1:100 or 1%. This means that for every 1 metre of pipe, there should be a 1cm drop in height.

What are the standards for stormwater drainage in Australia?

The standards for stormwater drainage in Australia are set out in the Australian Rainfall and Runoff (ARR) guidelines. These guidelines provide a framework for designing, constructing and maintaining stormwater drainage systems.

Who is responsible for stormwater drains in Victoria?

In Victoria, local councils are responsible for the maintenance and management of stormwater drains on public land. Property owners are responsible for the maintenance and management of stormwater drains on private property.

What is the legal point of discharge for stormwater in Victoria?

The legal point of discharge for stormwater in Victoria is determined by the local council. Property owners are required to connect their stormwater drainage system to the legal point of discharge.

Do downpipes need to be connected to stormwater in Victoria?

Yes, downpipes need to be connected to the stormwater drainage system in Victoria. This is to ensure that rainwater is collected and directed to the legal point of discharge.

What are the regulations for stormwater drainage on private property in Victoria?

In Victoria, property owners are required to ensure that their stormwater drainage system does not cause damage to neighbouring properties or the environment. The system must be designed, constructed and maintained in accordance with the relevant regulations and guidelines. Property owners may be required to obtain a permit from their local council before undertaking any works on their stormwater drainage system.

Wrapping Up

Stormwater drainage regulations in Victoria play a vital role in managing and mitigating the impacts of stormwater runoff. These regulations are designed to protect our environment, prevent flooding, and ensure the sustainable use of water resources.

If you have any questions regarding stormwater drainage regulations in Victoria or need assistance with your specific project, we encourage you to contact SQM Architects. Our team of experts specializes in navigating these regulations and can provide valuable guidance to ensure that your project complies with the necessary requirements.