Quote:
Originally posted by John LaPointe
One other note is that PVC is a much more reliable drain pipe especially if you have the opportunity for flushing. Flexible, corrogated pipe encourages sediments to fall out of suspension, which is the opposite of what we would want. Also, corrogated pipe can not be flushed.
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It sounds like your referring to what we call ADS, 4" black corrugated pipe available in coils. It is more economical than PVC and is easier to work with in some cases where the trench is not straight, but I agree that PVC will function better. Each of the ridges cast into the ADS serves as a point for debris and sediment to lodge. It also restricts water flow to an extent. If you aren't careful in laying it in the trench, you can end up with high spots along the length of the trench, also affecting performance.
ADS is more likely to collapse under the weight of the stone than PVC as well. I've seen it happen to my surprise.