I am running my downspouts to buried pipe to be piped away from my house. The   
   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 about 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 side of my house.)   
      
   In that 70 feet, there will be approximately 17 inches of drop.   
      
   What size/how many underground pipes would you recommend?   
      
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