Patio area - Run off areas

[diymark]

Hi Everyone,

I have to drop my exisiting patio area 6 " from around the back off my house.

There is only one grid which is at the opposite end to the patio door.

The patio area seperates a lawn from the house, so by dropping the patio area 6" I am going to have to build a small retaing wall in front of the lawn.

My question is about run off areas.

Do I try and create slopes so that the water from the patio door runs along the front of the extension, around the corner and down the grid or do I insert drilled drainage channels so that the run off areas are not far.

Also, do I have to make sure the water runs away from the retaining wall. And should I put in a drainage hole or two in the retaining wall for the lawn water?

If I'm not making myself clear, I'll answer any questions you have.


Please help - Thank you.

[Tony McC]

If I've mentally pictured this correctly, I'd be tempted to slope the patio away from the house, towards the lawn/retainer structure, and then install a linear channel along that retainer, connecting it to the existing SW system via underground pipes.