Detention tanks are an essential part of modern stormwater management systems, especially in urban and developed environments. Designed to temporarily store stormwater and release it slowly, detention tanks help reduce the pressure on public infrastructure, minimise flooding risks, and support environmentally responsible water management.
In cities and suburbs, impervious surfaces like roads, roofs, and driveways prevent water from soaking into the ground. This increases surface runoff, which can overwhelm stormwater networks. Detention tanks are used to slow the release of this runoff and manage peak flow rates effectively.
Local councils often require detention tanks for new residential or commercial buildings to meet consent and compliance standards. These tanks help prevent overloading the existing drainage systems, particularly in high-density areas.
Sites with poor drainage, steep slopes, or flood risk benefit from detention tanks. They control the flow of water and reduce the likelihood of erosion and property damage during heavy rainfall events.
When multiple properties share drainage infrastructure, detention tanks help regulate the collective outflow and maintain stormwater compliance at a catchment-wide level.
Slowing stormwater discharge protects pipes, culverts, and public waterways from sudden surges of water, which can cause damage and long-term wear to community infrastructure.
Detention tanks do not store water for reuse—that’s the role of a retention tank. Instead, they temporarily hold stormwater and discharge it at a controlled rate back into the stormwater system.
We offer engineered detention tank solutions that meet council regulations, are designed for New Zealand conditions, and are easy to install. Whether it’s a StormLite®, StormSlab®, or a custom build, our team can support your project from design to delivery.
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