I'm in my second year of business now, and I've done quite a few retaining walls, but I'm just starting my first wall which will require geogrid. The question I have is about which direction to roll out the geogrid behind the wall, as I've read opposite things. I've attached a picture below of the geogrid I'll be installing, and I'm hoping that someone can tell me if the side I labelled X should be running parallel or perpindicular to the wall face. I also want to install perforated pipe as a drain which I've never had to do before, and I was just wondering where I can buy it from?? Or does anyone have any different suggestions on what to use as a drain? Thanks in advance for any replies.