When it comes to infrastructure performance, drainage systems are not just important – they’re essential. At Fowler & Holden, we manufacture FastFlow™: the UK’s only Kitemark-certified Type-I D400 bridge drainage system. This blog outlines why FastFlow™ is the smart, certified, and future-ready choice for bridge deck applications.
Understanding the D400 Bridge Drainage System
Engineers design the D400 bridge drainage system to handle heavy traffic loads of up to 400 kN. The term D400 refers to the load classification under EN1433, the standard required for roadways, highways, and bridge installations.
FastFlow™ meets all requirements for D400 load class and goes beyond by providing added performance, reliability, and installation flexibility. It’s not just compliant – it’s engineered for excellence.
What Is a Type-I Drainage System?
Type-I systems are the highest standard under EN1433. They transfer all load through the frame and cover directly to the surrounding concrete, ensuring maximum strength and stability.
FastFlow™ is a true Type-I solution. That means you can install it without relying on the channel body to take the load, making it safer and more robust – especially critical in bridge deck applications.
As a UK Type-I drainage supplier, Fowler & Holden guarantees product integrity backed by full traceability and third-party testing.
Key Features of FastFlow™
1. EN1433 Compliant with Kitemark Certification
FastFlow™ is independently certified to meet EN1433 standards, and is the only UK-made Type-I D400 system with the BSI Kitemark.
2. D400 Load Class
Ideal for bridge decks and highways, handling repeated 400kN axle loads without deformation.
3. Bespoke Engineering
Units can be designed to accommodate specific gradients, curvatures, and expansion joint requirements.
4. Manufactured in the UK
No overseas shipping delays. Reliable lead times and lower carbon footprint.
5. Full Support from Fowler & Holden
We offer CAD drawings, load data, and installation guidance.
Solving Real Challenges in Highway Drainage
FastFlow™ solves multiple challenges civil engineers and contractors face:
- Weight-bearing: Proven under heavy vehicle traffic.
- Bridge movement: Accommodates thermal expansion with flexible units.
- Debris clearance: Features rodding units for easy maintenance.
- Tight timelines: Manufactured and delivered quickly from our UK facility.
Whether for new builds or infrastructure upgrades, FastFlow™ delivers long-term value and safety.
Trusted for Infrastructure Castings Across the UK
Fowler & Holden has supplied infrastructure castings for over a century. Our castings deliver strength, reliability, and compliance for everything from municipal bridges to national highways.
FastFlow™ is designed for:
- Major road and bridge networks.
- Public infrastructure projects.
- Civil engineering schemes.
- Transport agency contracts.
FAQs
What does D400 mean in drainage?
It refers to the load class (400kN) for heavy-duty drainage systems used in roads and bridges.
Is FastFlow™ certified?
Yes. FastFlow™ is the only UK-manufactured D400 bridge drainage system with a Kitemark and EN1433 compliance.
What is the benefit of Type-I over Type-M?
Type-I systems distribute loads more safely and don’t rely on the channel body for strength.
Can you supply CAD files and installation data?
Absolutely. We provide full technical support.
Is FastFlow™ made in the UK?
Yes. It is manufactured in-house by Fowler & Holden in Grimsby.
Why Choose FastFlow™ and Fowler & Holden?
When selecting a D400 bridge drainage system, you need proven quality, engineering reliability, and ongoing support. FastFlow™ delivers all three.
As a Type-I drainage supplier and infrastructure casting specialist, we understand the importance of standards, deadlines, and structural safety.
To specify FastFlow™ for your next project:
Contact us
Call: +44 (0)1472 355 316
Email: admin@fowlerandholden.co.uk
