Full-Bore Performance, Engineered Certainty
High quality performance with no compromises
HydroStorm work from the principle – exclude air, run full-bore and delivers it as a BBA-approved, standards-aligned system engineered for predictable performance, verified installation, and long-term maintainability.
1. Performance that comes from eliminating air (not oversizing pipe)
At design rainfall, the system is engineered to transition from priming flow to stable full-bore operation, using roof outlets designed to limit air ingress and maintain hydraulic continuity through the pipe network. That’s what unlocks siphonic capacity without the sprawl of conventional gravity pipework.
2. Designed against the right rulebook (today’s, not yesterdays)
HydroStorm designs and verification sit in the UK/European framework for roof drainage:
- BS EN 12056-3 sets the overall roof drainage design context and performance expectations
- BS 8490:2025 provides current UK guidance for siphonic roof drainage systems covering design parameters, installation, verification, and maintenance
3. BBA approval: confidence you can specify
When you say BBA-approved, the subtext to architects, specifiers, insurers, and building control is: this isn’t brochure-physics; it’s been independently assessed, audited, and certified against defined performance and quality processes.
- Independent third-party certification to support specification confidence
- Risk mitigation through assessment, testing, and audit-backed certification
- Third Party certification – TUV Rhineland Wurzburg, Germany
- Third Part Testing – CRM, United Kingdom
4. Engineered deliverables clients actually buy
Position HydroStorm as a complete system delivery, not “pipes and outlets”:
- Project-specific hydraulic design (roof zones, outlet strategy, tailpipes, collector routing, downstream interface)
- Verification & commissioning intent aligned to BS 8490 guidance (design checks, installation checks, and maintainability expectations)
- Maintainable-by-design: access strategy, debris management at outlets, and clear inspection points—because a siphonic system’s brilliance is only valuable if it stays brilliant
5. The headline benefits
- Higher capacity per diameter because the system is designed for full-bore flow, not partially full gravity flow
- Fewer penetrations / downpipes (typical outcome of higher-capacity routing, subject to roof geometry)
- Flatter, high-level horizontals that preserve headroom and simplify coordination
- Cleaner building design: less underground drainage congestion and fewer clashes with structure/services
