A Microsoft Excel workbook has been created and is available for download to aid in sizing your water harvesting system based on the demand of your livestock and the catchment area available for collecting water. An instructional tab is provided within the workbook to provide guidance on use and interpretation of the water harvesting system–sizing tool.
Water storage structures are the most expensive component of the system. Storage structures in a rainwater harvesting system may include tanks, cisterns, ponds, bladders, or a variety of other options. The storage volume can be equal to or slightly exceed the normal water demand between rainfall events, if the catchment area can provide it. The volume in gallons provides the producer an idea of how long livestock can utilize a specified area based on herd size and water requirements.