Hi
I’d like to install a channel drain but I have a few queries I’m hoping to get some advice about. My drive has a slight decline for approx. 20 feet before it levels out for another 10 feet. The drive is approx. 25 feet wide. It has a layer of asphalt that is crumbling away. Underneath, is approx. 3 inches of concrete. I’m planning to remove the asphalt. What I’m not sure about is if I need to make a channel the same as I would if there was no concrete?