Installing drainage channel - Break out footing?

[dig dug dan]

I am trying to re landscape my small garden at home, and have a small paving area running along the length of a large conservatory.
At present, the slabs slope towards the conservatory, and drain into a 4" wide shingle channel.
I want to remove the shingle when i repave, and replace it with a drainage channel. I am sick of pulling weeds out of the shingle all the time, and it will make it easier to drain water from the surface when i pressure wash .
Problem is, that the shingle is 4" deep, then i hit the concrete footing of the conservatory. I need 5" for the drainage channels.
At the moment. this is 6" below damp, so no room to lift up the paving.
How structural is it if i break out this concrete all the way along??

[lutonlagerlout]

ringing you now mate
LLL

[jonnyboyentire]

the resin channels are lower depth i recall

[Pablo]

Acco do a 50mm black plastic channel which is perfect for these jobs and not to pricey either.

[GB_Groundworks]

can get the resin ones in 50mm depth as well

[Dave_L]

Yep, go for the slimline aco resin channels, about £8/unit.

[dig dug dan]

Yep, go for the slimline aco resin channels, about £8/unit.

i like the sound of that! can someone also advise me how you punch out the hole without the whole thing shattering??

[DNgroundworks]

Very carefully lay on flat hard surface like concrete, tarmac etc, and then tap away gently untill it pops out. Ive had some of the resin ones crack on me but not the plastic

[GB_Groundworks]

have core cut the £70 resin sump boxes before, out of fear of cracking them

[jonnyboyentire]

core drill all the way

[Dave_L]

Stihl saw and cut neat square where outlet req'd, tap out centre with small hammer