Understanding Slot Channel Drainage

The newest addition to the United Civils Supplies channel offering is the DekDrain Vela A15 Edge Slot Channel Drain. It’s a high performing, discreet drainage solution designed for modern landscaping. In this guide, we will explain what it is, where to use it and how to install it – making sure you choose the right system for your project.

What is the Deks Vela Edge Slot Drain?

The Vela Edge is a linear drainage channel with a narrow asymmetric slot opening, designed to sit flush against block paving or a door threshold. There are 2 upstand heights 87mm to suit block pavior and 20mm to suit porcelain paving applications. Instead of the common visible grate, it uses a narrow stainless steel edge, making it ideal for a sharp, contemporary finish. It forms part of the Deks A15 system, making it suitable for pedestrian and light weight applications. Check our article ‘Understanding Manhole Cover Weight Ratings’ for a break down on weight classifications.

Key Features

• Discrete appearance – slim slot design blends into paving
• Stainless steel edge – durable and corrosion-resistant
• Modular system – 1m lengths for easy layout and cutting
• DIY-friendly installation – lightweight and simple to connect
• Flexible build options – multiple depths and upstand heights
• A15 load rating – suitable for domestic use (pedestrian + light vehicles)

Available Options

The system is designed to work with different paving builds:

• Channel depths:

1. 50mm (shallower installations)
2. 84mm (standard installations)

• Upstand heights:

1. 20mm – ideal for porcelain paving
2. 87mm – suited for block paving or deeper builds

Typical Applications

The Vela Edge Slot Drain is commonly used in:

• Garden patios and terraces
• Porcelain paving installations
• Domestic driveways
• Garage entrances and thresholds
• Around house perimeters

It is particularly popular amongst customers looking for a modern look to their project due to the stainless-steel finish of the slot.

How It Works

Water flows into the narrow slot at the surface and is directed into the drainage channel below. The system is designed to:

• Efficiently capture surface water
• Reduce visible debris build-up
• Provide a cleaner look than traditional grated drains

Installation Overview

The system is designed to be simple to install with a few steps to follow. These basic steps include:

1. Excavate a trench to accommodate the channel and concrete base
2. Lay a concrete bed to support the channel
3. Position and connect channels using the interlocking ends
4. Set the correct level so the slot sits flush with paving
5. Connect to drainage using a bottom outlet  
6. Haunch with concrete and complete paving up to the edge

Important: Always ensure a slight fall towards the outlet to allow proper drainage flow.

Compatibility & Accessories

The Vela Edge system works with a range of accessories, allowing full system builds:

• End caps
• Bottom outlets
• Sump units with debris traps
• Connectors for corners and junctions

These components help adapt the system to different layouts and drainage requirements.

When Should You Choose a Slot Drain?

A brick slot drain like the Vela Edge is ideal when:

• You want a clean, almost invisible finish
• You are installing porcelain or premium paving
• Safety is important (heel-safe narrow opening)
• You prefer a low-maintenance drainage solution

Key Things to Consider

• Ensure the correct depth and upstand for your paving type
• Check that the system connects to a suitable drainage outlet
• Follow drainage regulations where applicable
• Not suitable for heavy vehicle traffic (beyond A15 rating)

Summary

• The Deks Vela Edge Brick Slot Drain offers a balance of performance, durability, and modern design. It’s a strong choice for DIY projects where both appearance and effective drainage are important.
• If you’re upgrading a patio or installing a new driveway, this system provides a professional finish without complex installation requirements.