So I need help with my gutters and my first problem is I'm having a hard time discussing them because I don't know what they're called. I have a low slope torch down roof that doesn't have attached gutters, but rather the drainage is built in to the edge of the roof. I can't seem to figure out what this type of gutter is called. It's basically just a shallow valley that runs the length of the roof edge and has a downspout at both ends that goes through the eave to a downspout. Does anyone know what these are called?