A 2 inch pipe for each? Is that what you mean?   
      
      
   On Wednesday, October 21, 2015 at 9:52:52 AM UTC-5, Rich. wrote:   
   >  wrote in message   
   > news:0ced4da4-6539-42f5-b122-331d998c9a34@googlegroups.com...   
   > >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?   
   >   
   > Bigger is not better in these cases, a 2" pipe will be more than sufficient.   
      
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