PolyStorm Modular Crates

SPACE AND STYLE: PolyStorm Modular Crates 500mm x 400mm x 1000mm

Polystorm modular geocellular crates provide underground stormwater storage, attenuation, and infiltration by creating large subsurface voids that capture rainwater runoff before it overwhelms drainage networks or causes surface flooding. With a 95% void ratio, each crate stores significantly more water per cubic metre than traditional stone or gravel soakaway systems, while the modular interlocking design allows engineers to configure storage volumes of virtually any shape or footprint to suit constrained urban sites, narrow service corridors, or shallow excavation depths. The system is BBA approved and engineered for a design life of 50 years under creep-limited conditions, with compressive strength rated at 44 tonnes/m², making it suitable for installation beneath trafficked surfaces including car parks, access roads, and commercial developments. As Kenyan cities face increasing flood risk from urbanisation and changing rainfall patterns, Polystorm offers a proven sustainable drainage (SuDS) solution that manages stormwater at source rather than transferring the problem downstream.

Technical Specifications

• Product type: Modular geocellular stormwater management crate
• Void ratio: 95%, providing maximum water storage capacity per unit volume
• Compressive strength: 44 tonnes/m² (per Kenya distributor data); manufacturer range across variants: 20 to 83 tonnes/m²
• Design life: 50 years creep-limited life expectancy (BBA certified); manufacturer states 60+ years for current range
• Certification: BBA Approved; SuDS compliant
• Material: 100% recyclable polypropylene
• Weight: Lightweight modular units (specific unit weight varies by variant)
• Functions: Retention (permanent storage), attenuation (temporary storage with controlled release), and infiltration (soakaway to ground)
• Applications: Car parks, housing developments, commercial developments, road infrastructure, sports facilities, and restricted-access urban sites
• Configuration: Modular cells interlock to form any plan shape; suitable for shallow, deep, and narrow excavation profiles
• Range variants available: Polystorm R, Polystorm Access, Polystorm Inspect, Polystorm Deep, Polystorm Xtra, Polystorm Biomat, Polystorm Catchpit, Polystorm Silt Trap, Polystorm Low-Flow Control Unit
• Accessories: Full range of geotextile wraps, connectors, inspection ports, and silt management components
• Design support: Polypipe provides hydraulic design and technical support services
• Supplier in Kenya: Space & Style Ltd (www.spaceandstyle.co.ke)

Sustainability Features

• 100% recyclable: Manufactured from polypropylene that can be fully recycled at end of life, supporting circular material use
• Reduced excavation volumes: The 95% void ratio means substantially smaller excavation pits compared to traditional gravel soakaways (which typically achieve only 30 to 40% void ratio), reducing spoil disposal, truck movements, and associated carbon emissions during construction
• Stormwater management at source: Captures and controls runoff before it enters the wider drainage network, reducing downstream flood risk, combined sewer overflow events, and the environmental contamination associated with uncontrolled surface water discharge
• Groundwater recharge: When configured for infiltration, the system returns captured rainwater to the water table, replenishing groundwater reserves rather than diverting all runoff to surface water systems
• Long design life: 50+ year creep-limited service life reduces the frequency of replacement and the environmental impact of repeated civil engineering works
• Lightweight modular construction: Lower unit weight compared to concrete tanks reduces transport fuel consumption and enables installation with smaller plant equipment, lowering on-site energy use and emissions
• Flood risk reduction: Directly addresses the increasing urban flood risk caused by impermeable surfaces in Kenya’s rapidly developing cities, protecting property, infrastructure, and livelihoods from water damage