I am running my downspouts to buried pipe to be piped away from my house. T he side I am working on has two downspouts. I am also adding about 5 small atrium drains. The underground pipe that will lead to daylight will be abou t 70 feet long. (This is not a straight run, there are curves as I am going parallel to the front of my house, turning, then going parallel to the sid e of my house.)
In that 70 feet, there will be approximately 17 inches of drop.
What size/how many underground pipes would you recommend?