I respectfully disagree. If anybody's interested, I opined about "positive drains" ten years ago, and the column is here: http://www.nashvillescene.com/1998-06-1 ... s/swamped/ Note: The old links at the bottom of the story don't work anymore. WJ I agree for the most part with your article from the Nashville Scene. The 2006 IRC (R401.3) does not call for a positive drain from inside the crawl space. However you see what happens when water does get into the crawl space, for whatever reason. When done right they will drain. Gravity works good. It's just good practice and is required in some juridictions, even though it isn't fancy or high tech. Portland, TN is one of them. The inspector actually looks for them. Thanks for disagreeing, no offense taken.