DETENTION TANKS
Searching for a reliable solution to manage stormwater runoff and prevent flooding on your property? As a trusted water tank supplier, our range of detention tanks offers advanced water management solutions that protect your property while complying with local regulations.
Protect your property.
From compact home systems to large-scale commercial stormwater detention tanks, we manufacture custom-made AQUAPLATE® corrugated steel water tanks to capture and control stormwater during heavy rainfall. Whether you’re a homeowner looking for flood protection or an engineer specifying stormwater solutions, we have the right rainwater detention tank for you.
Meet your regulatory obligations.
Explore our storm detention tank range below or contact our team of experts to discuss your unique needs. All of our tanks can be made as detention, retention or dual purpose (retention & detention), so we have you covered.
SLIMLINE TANKS
Perfect for narrow spaces, usually to fit alongside houses or in limited access areas. Capacity 500 to 10,000 litres.
MODLINE TANKS
Flat ends offer a modern look and smaller footprint than the equivalent capacity Slimline tank. Capacity 770 to 10,000 litres.
SQUARE TANKS
Space saving smaller footprint than the equivalent capacity Slimline or Modline tanks. Capacity 530 to 9,000 litres.
ROUND TANKS
A popular choice for larger properties where access is unobstructed. Capacity 550 to 24,500 litres.
ACCESSORIES
Browse our range of tank fittings, water pumps, water filters, tank level gauges and more.
NEED HELP OR A CUSTOM-MADE TANK?
of experts
Why install a stormwater detention tank?
A stormwater attenuation tank, also known as a detention tank, is essential for property protection and environmental compliance. It prevents flooding by capturing excess rainwater during heavy downpours and gradually releasing it into the drainage system, protecting your property and downstream areas from water damage and erosion.
Beyond compliance, detention tanks reduce infrastructure costs by minimising the size requirements of other drainage components. They are vital in preventing waterway contamination and maintaining natural water cycles.
Additionally, local councils, like Auckland Council, often require a stormwater detention tank for new builds and renovations, making them crucial for resource consent approval.
There’s a lot to like about our above-ground water tanks.
PEACE OF MIND
Our water tanks are backed by a 20-year corrosion and 10-year construction warranty.
NZ MADE
Our water tanks are made with pride by our passionate team dedicated to helping you from specifying through to delivery and installation.
SUSTAINABLE
We use AQUAPLATE® corrugated steel which is fully recyclable and has the lowest overall environmental impact compared to plastic or concrete tanks.
BEAUTIFUL
Our water tanks are loved by architects and homeowners who appreciate that functionality can look great too.
COST EFFECTIVE
Buying a beautiful tank in the exact size that meets your requirements reduces installation and landscaping costs.
CUSTOM MADE
Get a water tank that fits perfectly in your available space to meet your unique water storage needs.
Fire resistant
Corrugated steel is a non-combustible material so our tanks can be placed beside dwellings or against boundaries.
Safe
Our water tanks meet AS/NZS 4020 standards for storage of drinking water. They do not contain the BPA and UV stabilisers.
Nationwide delivery
Talk to us to get the water tank you need, delivered when and where you want it.
Our commitment to you.
Since 2008, we’ve been manufacturing standard and custom-made water tanks to meet our customers’ unique needs across New Zealand. Whether you’re a homeowner, plumber, drainlayer, architect, civil/hydraulic engineer, quantity surveyor, or property developer, you can trust us to deliver. Our attention to detail, use of quality materials, and exceptional customer support set us apart and demonstrate why we are a unique and reliable Kiwi-owned water tank company.
FAQ's
How do detention tanks differ from retention tanks?
While both detention and retention tanks manage stormwater, they serve different purposes. A stormwater detention tank temporarily stores excess rainwater during heavy rainfall before releasing it gradually into the drainage system. The primary function is controlled release over time.
Retention tanks store water permanently for reuse around your home for things like garden irrigation, toilet flushing and washing machines. Unlike detention tanks, retention tanks don’t release water into the drainage network but instead keep it for later use.
When is a stormwater attenuation tank required?
Attenuation tanks are typically required for new builds, major renovations, or when adding significant impervious surfaces to your property, such as driveways or large paved areas.
The specific requirements for a storm water attenuation tank depend on several factors, including:
Property location and size
Properties in flood-prone zones or near sensitive environmental areas may face stricter requirements. Larger properties with extensive impervious surfaces typically need larger stormwater detention tanks or additional mitigation measures.
Impervious surface area
The greater the area covered by non-permeable materials, the more stormwater runoff your property generates, increasing the need for effective stormwater management solutions.
Local regulations
Regional and local councils set guidelines for attenuation tanks. These regulations ensure compliance with environmental standards and help manage the cumulative effects of urban development.
Flood risk assessment
Areas with high flood risks may require more robust storm water attenuation tanks to reduce potential damage during heavy rainfall events.
What maintenance is required for a storm water detention tank?
Regular maintenance keeps your storm water tank performing properly. We recommend having your system professionally inspected annually and after major storm events to check for debris buildup, sediment accumulation, and proper function of inlet and outlet structures. Typical maintenance tasks include:
- Removing debris from screens and filters
- Checking and cleaning inlet/outlet pipes
- Checking and ensuring the slow-release orifice is clear and unobstructed
- Removing accumulated sediment
What is the difference between a retention tank and a detention tank?
A retention water tank is designed to capture and store stormwater runoff for later use. It retains the water on-site, preventing it from immediately entering the drainage system. This stored water can be used for irrigation, landscaping, or other non-potable purposes, contributing to sustainable water management practices. Retention tanks help reduce the demand on municipal water supplies and mitigate the impact of urban development on local water resources.
A detention water tank is primarily focussed on controlling the flow and release of stormwater to prevent flooding and erosion. Detention tanks temporarily hold and slowly release stormwater into the drainage system at a controlled rate. This helps manage peak flows during heavy rainfall, reducing the risk of downstream flooding and erosion.
What is the lead time on water tanks?
We can turn around your tank order in 7 to 10 working days, excluding delivery. Contact us to discuss your requirements and we will confirm your lead time.
Where do you deliver and how much does it cost?
We deliver tanks to metropolitan Auckland for free and can arrange nationwide delivery. Contact us to discuss your requirements and we will prepare an estimate.
What is a seismic restraint?
Seismic restraints are designed to secure water tanks and prevent them from tipping, sliding, or overturning during an earthquake. The ground shaking during seismic events can pose a significant risk to the stability of structures, including water tanks, and securing them is essential to ensure public safety and the integrity of water supply systems. Seismic restraints also help minimise the risk of damage to the tank itself and reduce the potential for water contamination or loss.
