This is a link to a some good building info. Most people have no idea what is needed to drain trails of water. A few of the modules spell it out pretty well.
A great resource for information
Posted by: heckler
there's one free Trail Academy course in North Van left this year - learn it direct from the builders of GSM & Penny Lane - two of the driest trails on Seymour!
I can't open the link, is it still up?