Surface Channel Drainage

[Uno Hoo!]

Having decided to drain my new patio properly by tapping into an underground rainwater drainpipe, I've been looking at channel drainage systems.

This one here:

that you can connect it directly to the drain, presumably without the use of a tick or bottle gulley. They appear to be making this claim on the basis that there is a built in debris trap at the end of the channel. Is this permitted? I would have thought that drainage regulations would have stipulated some sort of a gully - if only to provide a sort of 'P' trap to prevent drain odours from reaching the surface.

Any comments?

Kev

[BigWallop]

If anything small enough gets through the debris catcher, but is sticky enough to attach itself to the inside of pipework, then you're going to have problems. Leaves and grasses are the worst culprits for this. It's always advisable to place an inline trap on these things, and not rely solely on basket weaving to stop things going down the drain.

The normal technique is to have a TEE connector placed in the main rainwater pipe with it's branch sticking out at the top, or slightly to an angle toward the new pipework. Then attach pipework to this that will shape the end in to a U type trap shape. It doesn't have to be huge, but enough to stop gases from blowing back up through the water seal and out in to the garden. Nothing worse than stinking vegetable / plant matter rotting away and smelling the patio out.

[Uno Hoo!]

I agree - despite what they claim I will put some form of trap/gulley into the system!

Kev