Do Channel Drains Have A "Built In" Slope Or Fall?

Domestic Channel Drains do not have a built in fall, they are made level. Some commercial (heavier load capacity) channel drains do come with built in falls, and we can order these in specially if required.

For domestic channel drainage though you should create a fall of 1 in 200, which equates to 5mm over a 1m length of channel. Most people using channel drain around their homes tend to use it on a driveway, often in front of a garage. Our garage packs are put together with this purpose in mind, and contain 3 x 1m lengths plus an outlet and a blank end. When using channel drain in front of a standard 3m wide single garage you would need to create a fall of approximately 15mm towards the outlet, assuming the outlet is at one end.

The table below shows exactly what depth of fall is required for straight runs of domestic channel drainage.

Length of Run

Fall Required (mm) - Outlet at One End

2.5m

12.5mm

3m

15mm

4m

20mm

5m

25mm

6m

30mm

8m

40mm

10mm

50mm

For further information on installing channel drainage, please watch our video which gives a basic overview of this product range.

Items you will need