How do I create a complete Rainwater Collection System? The image below shows a complete rainwater collection system. While some of the components shown are absolutely necessary, not all of the components listed are required.
How to calculate how much water you can harvest from your roof: Collection area (total square footage of your roof) x x (the number assigned to the collection efficiency of a tile roof) x rainfall (in actual or averaged inches) = gallons/year.
This is great since we don't have any outdoor hose hookups! How to Build a Rain Barrel. A dual barrel system that uses atmospheric pressure to equalize the water volume in both rain barrels. Use the water from your rain barrels to water your plants.