What Is An Underground Water Tank? | ACO StormBrixx

Managing water efficiently is an important part of sustainable urban development, especially in environments where space is limited. Underground water tanks offer a smart solution for collecting and storing water without impacting surface space. In this article, we explore what underground water tanks are, their benefits and types, and how modular systems can support more effective water management.

What is an underground tank?

An underground water tank is designed to store a property’s stormwater runoff. It acts as a buffer during periods of low rainfall or high water usage, helping maintain consistent access to reusable water. It supports efficient and sustainable water use.

Underground tanks are a common feature in commercial properties and are also used in civil and urban settings where space is limited, or surface installation isn’t suitable.

Benefits of an underground water storage tank

Storing water underground offers several practical and environmental benefits:

• Space-saving — No above-ground footprint means more room for landscaping or built structures.
• Visually discreet — Tanks are hidden from view, ideal for projects with aesthetic or planning constraints.
• Temperature stability — Water stays cooler underground, reducing the risk of algae growth.
• Reduced contamination risk — Being below the surface protects the tank from UV exposure and environmental debris.
• Stormwater management — Tanks can capture runoff, reducing pressure on drainage infrastructure.

Types of underground water tanks

There are several types of underground tanks available in the market, each with different advantages depending on the application and site conditions.

• Concrete tanks

Known for their strength and durability, concrete tanks are ideal for large-scale storage and high-traffic areas. They are resistant to fire and can last for decades with minimal maintenance. However, they are expensive, heavy and typically require specialised equipment for installation.

• Steel tanks

Steel tanks, often made from stainless or galvanised steel, offer a balance between strength and weight. They are commonly used in rural and industrial projects, but may require protective coatings to avoid corrosion over time.

• Polyethylene (plastic) tanks

Lightweight and corrosion-resistant, plastic tanks are a popular choice. They’re easier to install than concrete and resistant to deterioration.

One standout example is a geocellular plastic-based system designed for demanding applications is ACO StormBrixx®. Built specifically for surface water infiltration, detention and retention, its modular design and structural strength makes it suitable for use across various types of construction environments.

Improve water management outcomes with ACO StormBrixx

For projects that demand an adaptable, high-performance underground water storage tank, ACO StormBrixx offers a reliable solution. It supports a wide range of layouts and load conditions, including installation under trafficable surfaces. ACO StormBrixx is ideal for rainwater harvesting, stormwater detention and long-term water storage. It also simplifies maintenance with an open design that allows easy inspection and maintenance. By integrating storage into the ground, it maximises land use while supporting sustainable water practices.

Learn more how ACO StormBrixx can support your water storage and drainage goals. Reach out to us to discuss design considerations and risk mitigation strategies for integrating underground water tanks.

Explore our complete range of ACO StormBrixx solutions, featuring comprehensive product specifications, system capabilities and installation guides to support smooth and efficient on-site implementation. For expert guidance, our team offers personalised technical project support to help you streamline your workflow and minimise errors.