DETENTION 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. 

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.

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:

1. Removing debris from screens and filters
2. Checking and cleaning inlet/outlet pipes
3. Checking and ensuring the slow-release orifice is clear and unobstructed
4. Removing accumulated sediment

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.

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.

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.

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.