Underground stormwater management
Regulate rainwater with efficient underground retention and infiltration tanks
The Nidaplast EP, AZbox and Optibox systems make it possible to build underground retention or infiltration basins designed for sustainable stormwater management.
These lightweight yet robust storage modules temporarily hold rainwater or stormwater, then release it gradually into the soil or the drainage network.
Fully buried, they free up surface space for other uses (roads, car parks, landscaped areas) while helping to prevent flooding risks.
A reliable, long-lasting solution for municipalities, engineering consultancies and contractors involved in hydraulic and urban development projects.
Our products for underground stormwater management
AZbox
The AZbox system, with a 95% void ratio, ensures the temporary storage of rainwater and allows for the creation of public or private underground structures that are controllable and hydro-cleanable.
Nidaplast EP
The underground rainwater storage modules nidaplast EP and nidaflow EP are polypropylene honeycomb blocks belonging to the SAUL family (Ultra-Light Honeycomb Structures).
Product comparison table
Product
Structure
Water diffusion type
Inspectability
Compression resistance
Nidaplast EP
Lightweight, rigid polypropylene cellular blocks
External diffuser
Inspection possible via drain
400 - 500 - 600 kPa
View product sheet
AZbox
Modular crates assembled by clipping
Internal three-dimensional diffusion
Access facilitated through inspection corridors
>300 kPa
View product sheet
Optibox
Modular crates with integrated fastenings
Internal three-dimensional diffusion
Integrated inspectability, easy maintenance
>300 kPa
View product sheet
Related case studies
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At a glance
Underground storage
Frees up surface space for other uses while regulating stormwater.
Flood prevention
Retains or infiltrates rainwater to reduce overflow and flooding risks.
Full modularity
Systems adaptable to any site configuration and storage volume.
Frequently asked questions
What is the difference between an infiltration basin and a sealed retention basin?
An infiltration basin allows water to gradually infiltrate into the soil, helping recharge groundwater bodies.
A sealed retention basin, equipped with a geomembrane, stores rainwater for later use (a pump will be required).
Both approaches regulate rainwater and stormwater while helping to prevent flooding.
Why choose an underground basin instead of an open one?
Underground storage offers a major land-use advantage: the surface remains available for car parks, roads or public spaces.
Nidaplast underground tanks also provide better landscape integration, improved safety and no visible standing water.
Are Nidaplast structures suitable for traffic loads?
Yes. EP, AZbox and Optibox modules can be covered by traffic areas or car parks.
Their high-strength cellular design enables them to withstand significant loads while ensuring structural durability.
Do these systems require specific maintenance?
Basins must be equipped with a pre-filtration device to limit sediment and debris.
An access chamber must also be installed for inspection and periodic maintenance, according to engineering specifications.
Interested in becoming a distributor?
Become a distributor of Nidaplast stormwater management solutions, renowned for their reliability and modularity.
Our Nidaplast EP, AZbox and Optibox ranges are manufactured in France and delivered with dedicated technical support for hydraulic projects.
Our engineering department provides layout plans and technical calculations based on information from the design office or project owner.
We offer personalised commercial support to facilitate your product listing.
Offer your clients underground retention and infiltration systems compliant with sustainable stormwater management standards, urban planning requirements and current water regulations.
Proven technical solutions
Our products are developed to meet real on-site requirements: performance, reliability and durability are at the core of every solution.
Committed to reducing environmental impact
At Nidaplast, we design recyclable products that incorporate recycled materials and are manufactured through a controlled industrial process with a low carbon footprint.
Tailored support
Whether technical experts, design office engineers or sales teams, our teams support professionals throughout their projects, both in the UK and internationally.
