Article provided by www.watercache.com (Innovative Water Solutions)
We believe that rainwater harvesting is a viable technology in an urban setting. All that is necessary to take advantage of this resource is to capture the free water falling on your roof and direct it to a rainwater storage tank. By doing this, you can take control of your water supply and replace all or at least a substantial portion of your water needs. Rainwater harvesting systems can be configured to supply your whole house and/or your landscape needs.
Read this comprehensive article here:
https://www.watercache.com/education/rainwater-harvesting-101