How to Select the Right Material for Your Stormwater Attenuation Tank?

February 16, 2024

Are you looking for a stormwater attenuation tank to manage the excess rainwater on your site? If so, you might be wondering what material to choose for your tank. After all, the material of your tank will affect its performance, lifespan, maintenance, and cost. Additionally, the right material can significantly impact the environmental sustainability of your project.

This post will help you compare the different materials available for stormwater attenuation tanks and guide you to make the best decision for your project and provide you high-quality stormwater attenuation tanks.

What is a Stormwater Attenuation Tank?

A stormwater attenuation tank is a type of underground storage system that collects and temporarily holds the excess rainwater that falls on your site. The tank then releases the water at a controlled rate into the drainage network or the natural environment, preventing flooding and erosion.

Stormwater attenuation tanks are essential for sites that have limited space, or high rainfall intensity. They can also help you comply with the local regulations and standards for stormwater management and reduce the environmental impact of your development.

What are the Common Materials for Stormwater Attenuation Tanks?

There are several materials that can be used to construct stormwater attenuation tanks, each with its own advantages and disadvantages. Here are some of the most common ones:


Concrete is a strong and durable material that can withstand high loads and pressures. It is also resistant to corrosion, fire, and chemicals. However, concrete is also heavy, expensive, and difficult to install. It requires a lot of excavation, reinforcement, and curing. It can also crack or leak over time, requiring frequent inspection and repair.


Plastic is a lightweight and flexible material that can be easily transported and installed. It is also cheaper than concrete and requires less maintenance. However, plastic is also less robust and more prone to deformation, puncture, and UV damage. It can also degrade over time, releasing harmful chemicals into the soil and water.


Steel is a metal alloy that is strong and resilient. It can withstand high temperatures, pressures, and impacts. It is also easy to fabricate and customise. However, steel is also prone to corrosion, rust, and oxidation. It requires protective coating and regular painting to prevent deterioration. It can also be noisy and conductive, posing safety risks.


Fibreglass is a composite material that is made of glass fibres and resin. It is lightweight, strong, and corrosion-resistant. It can also be moulded into various shapes and sizes. However, fibreglass is also brittle and can crack or shatter under stress. It can also be expensive and difficult to repair. It can also pose health hazards if the fibres are inhaled or ingested.

How to Choose the Best Material for Your Stormwater Attenuation Tank?

The best material for your stormwater attenuation tank will depend on several factors, such as:

The size and shape of your tank

The size and shape of your tank will determine how much material you need and how easy it is to install. For example, if you need a large or irregular-shaped tank, you might prefer a material that is flexible and customizable, such as plastic or fibreglass. If you need a small or standard-shaped tank, you might prefer a material that is strong and stable, such as concrete or steel.

The location and soil conditions of your site

The location and soil conditions of your site will affect how well your tank can handle the external forces and stresses. For example, if your site is in a high water table or acidic soil, you might prefer a material that is corrosion-resistant, such as fibreglass or plastic. If your site is in a seismic or frost-prone area, you might prefer a material that is resilient and crack-resistant, such as steel or concrete.

The budget and timeline of your project

The budget and timeline of your project will influence how much you can afford and how fast you can install your tank. For example, if you have a tight budget or a short deadline, you might prefer a material that is cheap and easy to install, such as plastic or fibreglass. If you have a generous budget or a long-term plan, you might prefer a material that is durable and low-maintenance, such as concrete or steel.

Secure Your Project's Success with Expert Stormwater Solutions – Contact Resolute Civils Today!

To wrap up, choosing the right material for your stormwater attenuation tank is pivotal, impacting its efficiency, longevity, and environmental compliance. The decision should be informed by your project's unique needs, considering factors like site conditions, budget, and timeline. Whether it's concrete's durability, plastic's ease of installation, steel's robustness, or fibreglass's resistance to corrosion, each material offers distinct advantages. To make these choices and ensure your stormwater management system is effective and sustainable, partner with Resolute Civils.

Our expertise in providing tailored solutions will help you select the ideal material for your tank, aligning with your project's goals and regulatory requirements. Contact Resolute Civils for professional guidance and high-quality stormwater solutions, and secure the success of your project with confidence.

Frequently Asked Questions

How does the ease of installation vary between different materials?

Plastic and fibreglass tanks are generally lighter and easier to install, requiring less heavy machinery and labour. In contrast, concrete and steel tanks are heavier, potentially increasing installation time and costs.

Can the material of a stormwater attenuation tank affect its environmental compliance?

Yes, materials like recycled plastic can offer environmental benefits and help projects meet sustainability goals. Compliance with environmental regulations also depends on the material's ability to prevent unwanted leakage, chemical resistance, and potential for leaching.

What are the advantages of using concrete for stormwater attenuation tanks?

Concrete is highly durable, has a long lifespan, and is capable of supporting large volumes of water, making it suitable for areas with high traffic loads or where structural integrity is a priority.

Why might someone choose a plastic stormwater attenuation tank?

Plastic tanks are lightweight, resistant to corrosion, and easy to install, making them a cost-effective option for sites with limited access or where rapid installation is required.

What makes steel a strong choice for stormwater attenuation tanks?

Steel is known for its strength and durability, making it suitable for harsh environments. It can also be coated to resist corrosion, extending its lifespan even in challenging conditions.

How does fibreglass compare to other materials for stormwater attenuation tanks?

Fibreglass is corrosion-resistant, lightweight, and strong, offering a long service life with minimal maintenance. It's an excellent choice for aggressive environments where chemical resistance is necessary.


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