Water harvesting is the practice of capturing rainwater (rooftop) runoff and storing it in a tank or cistern for use around a home or business. This has wider application for agriculture as well, such as providing water for livestock and having a water source for cleaning.
NC State Extension has several resources with important information and guidance for setting up a rainwater harvesting system. These documents provide details for non-human consumption.
Publications:
Rainwater Harvesting: Guidance for Homeowners
Choosing a Pump for Rainwater Harvesting
Texas A&M's Agrilife Extension Website provides guidance for making rainwater potable for humans: Rainwater Harvesting
The Town of Cary has produced an overview video featuring Mitch Woodward, Area Environmental Agent:
