Rainwater collection on high tunnels can reduce irrigation costs significantly. This video and seven-page fact sheet from the Leopold Center for Sustainable Agriculture shows just how to do it.
High tunnels look like those small hoop houses that gardeners use in their backyards to protect crops from the extremes of weather. On larger farms, the hoop houses just get larger, too.
A half-inch of rain will produce approximately nine hundred gallons of water from a 30′ by 96′ high tunnel, making it well worth the effort and expense to install this system.
The video below shows the installation of the system. The seven-page report is available here in pdf format. The report includes a list of components for the system.