we've edited together some footage we shot last winter into a 1 minute video to give a quick overview of how a basic rainwater catchment system works.
the amount of rain you can harvest will, of course, vary according to the area of your roof. there are formulas for this, but the basic gist is that a 1000 square feet of roof can provide 600 gallons of water for every inch of rain. there are also ways to use swales and berms to slow down and direct the flow of water on your land in order to create areas of higher moisture where trees and croplands can flourish. we learned so much from brad lancaster's book rainwater harvesting for drylands - one of our favorite reference materials.