Connecting downpipe direct to land drain

[prologica]

Hi

Several of my 68mm downpipes currently dump water into individual cemented gullies where the water rises until it flows into a 60mm pipe which runs either to an outlet in the garden wall or (I think) into a land drain.

I'm a bit concerned some cracking in the walls and want to rule out failure of the gullies asa cause. I was thinking I could connect the downpipes directly to the 60mm pipe (would need an angled or flexible connector, or a trap of some description (but space is limited if I want to avoid demolishing the bricked gully surround).

Is there any reason I shouldn't connect up in this way?

Thanks
D

 

[Ian H]

Have you got a photo of the cemented gullies?