Where to situate drain channels ?

[Bilabonic]

Hi

I am in the process of removing tonnes of earth since my garden slopes with house on lower level.

I will be putting in french doors and new patio which will be on the lower level.

Where is the best place to put drainage gulleys ?

On the house side or retaining wall side ?

Also how do you know how many to have.

Here are the prelim plans - http://ext.pavingexpert.com/cgi-bin....;t=6914

I was thinking a long channel the length of the property along the horizontal grey line with the patio sloping towards it ?

This would also lead to a manhole drain as well.

Any thoughts ?

Cheers

[Dave_L]

That's what I'd do - run the channels around the building as/where required. Make sure your 150mm below DPC is maintained.