There are many different kinds of channel drains. They vary in size, shape, color and material depending the use case. The narrowest we install is about an inch and a half, and the widest is about 6 inches. The install process for channel drains is the trickiest of all of our drainage systems, as there is many variables, like cautious demo, color matching, proper grading, proper concrete pours and the usual limited amount of space we are working with. That being said, the possibilities for channel drains are never ending, they are incredibly customizable and end up complimenting the outdoor space visually, on top of solving any existing drainage issues.