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Old 08-28-2006, 01:45 PM   #1
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Minimum Fall

I am running (burying) 4" PVC from the downspout away from the house. What is the minimum fall I should have in the pipes. Thanks.
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Old 08-28-2006, 05:27 PM   #2
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Minimum Fall

What will the rainwater be dumping into at the end of the pipe if it's underground? Is there just one downpipe?
As for the slope of the pvc, I would say 1/4" for every one foot.
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Old 08-28-2006, 06:22 PM   #3
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Minimum Fall

Depends on what code you use, hear as long as there is no backgrade it can be flat, but slope is always best, 1/8 for rain drains.
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Old 08-29-2006, 09:00 AM   #4
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Minimum Fall

Ron: Thanks. The pipe will be draining onto the front lawn which slopes pretty steeply away from the house.
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