Channel Drainage Technical Guides
Looking for a quick answer? Browse 32 basic drainage questions →Practical guidance for selecting, comparing, specifying and installing channel drainage systems. Covering EN 1433 load classifications, material selection, installation requirements and application-specific advice — written to help you choose the right product and ask the right questions, not to replace project-specific engineering assessment.
Most Read Guide
A15 vs B125 — Which Channel Drain Do You Need?
The most common domestic drainage question: patio or driveway? Pedestrian or vehicle? Full comparison table, 6 selection scenarios and 8 FAQs covering the cases where it is not immediately obvious.
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Help choosing the right system
A15 vs B125 — Which Do You Need?
The most common domestic drainage selection question. Pedestrian or driveway — full comparison table, selection scenarios and FAQs.
C250 vs D400 — Which Load Class?
Commercial car park or road? When C250 is sufficient and when D400 is required — comparison table and FAQs.
How to Choose a Channel Drain
A practical eight-step selection guide covering application, traffic type, load class, material, grate finish, layout and accessories.
Slot Drain vs Grated Channel
When a discreet slot drain is better — and when a grated channel is the right choice. Comparison table and FAQs.
Technical Reference
Standards, classification and materials
Channel Drain Load Classes Explained
A15, B125, C250, D400 and F900 — what each EN 1433 classification means, where each applies, and when to step up to a higher class.
What is a Heelguard Grate?
What heelguard means, when it is required, and which Forti Nova products include heelguard grating.
Plastic vs Polymer Concrete Channel Drainage
Material differences, strength, weight, cost, chemical resistance and typical applications — when each material is the right choice.
Installation
How to specify and install correctly
Channel Drainage Installation Guide
Key installation considerations — concrete surround specification, fall, outlet connection, bedding and manufacturer requirements.
Common Installation Mistakes
The eight most common channel drain installation errors — wrong load class, no fall, no sump unit — and how to avoid them.
Application Guides
Project-type specific guidance
Driveway Drainage Guide
Positioning, load class selection (B125 vs A15), material choice, accessory planning and surface water regulatory requirements.
Driveway Drainage Regulations UK
When planning permission is required for impermeable driveway surfacing in England, and how channel drainage relates to compliance.
Browse by Topic
Load Classes
A15 · B125 · C250 · D400 · F900
Driveway Drainage
B125 products and selection
Domestic Drainage
A15 products for patios and paths
Threshold Drainage
Bi-fold door and patio transitions
Commercial Drainage
C250 products and applications
Industrial Drainage
D400 and F900 heavy-duty systems
Frequently Asked Questions
Which guide should I read first?
If you are unsure whether you need an A15 or B125 channel — the most common domestic question — start with the A15 vs B125 guide. If you are selecting a channel for a project from scratch, the How to Choose a Channel Drain guide walks through the full selection process. If you need to understand load classifications before specifying, read Load Classes Explained.
Do these guides replace professional engineering advice?
No. The guides are designed to help you understand drainage terminology, ask the right questions and narrow down product options — they are not a substitute for professional engineering assessment. For projects involving highways, adopted drainage, structural loads, or commercial and industrial applications, you should engage a qualified drainage engineer or civil engineer. Forti Nova does not provide engineering design services.
What is EN 1433 and why does it matter?
EN 1433 is the European standard for drainage channels for traffic and pedestrian areas. It defines load classifications (A15 through F900), testing methods and marking requirements for linear drainage products. When a channel is described as B125 or D400, those designations refer to EN 1433 load classes. The standard matters because it allows products from different manufacturers to be compared on a consistent basis and gives specifiers a framework for selecting the appropriate product for the loading conditions of their project.
Is there a guide for commercial or industrial drainage?
The Load Classes Explained guide covers C250 (commercial) and D400 (road/heavy vehicle) classifications. The How to Choose a Channel Drain guide includes commercial selection considerations. For specific D400 or F900 project enquiries, contact our technical team directly — commercial and industrial drainage is typically specified with engineering input and our team can support the specification process.