Stormwater Detention vs Retention: What’s the Difference?

Stormwater detention and retention are two distinct approaches to managing runoff, and ModuTank systems are engineered to support both. Whether your project requires short-term water control or long-term storage, our modular tanks provide a flexible, scalable solution that adapts to your specific site conditions and regulatory needs.

Detention systems are designed to temporarily store stormwater and release it gradually to prevent downstream flooding, erosion, and overloading of municipal drainage systems. ModuTank’s modular containment units are ideal for this application. Their above-ground, bolt-together design allows for rapid installation on construction sites, industrial properties, and other areas prone to heavy runoff.

Retention systems, by contrast, are built to permanently hold water. This allows for infiltration into the ground, evaporation, or repurposing for non-potable uses such as irrigation or dust control. ModuTank systems are all configured with impermeable liners and fitted with various ancillaries to support retention goals. These setups are particularly beneficial for projects focused on sustainability, groundwater recharge, or water conservation.

The advantage of ModuTank’s modular approach lies in its adaptability. The same tank system can be modified with different membranes, baffles and weirs, valves, and drainage features to serve either detention or retention purposes. Capacity can be scaled as needed, and systems can be relocated or repurposed for future projects, making them a cost-effective long-term investment.

From managing storm surges on active job sites to supporting green infrastructure initiatives, ModuTank delivers containment systems that align with both environmental goals and regulatory standards. Whether your project demands rapid runoff control or sustainable water management, our tanks offer the versatility and performance to accomplish your application’s goals.

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