Rainwater Harvesting for Drylands And Beyond, by Brad Lancaster. Go beyond the cistern - learn new ways to welcome rainfall into your landscape and live a little lighter on the planet.
Find Brad's book here
Texas Manual on Rainwater Harvesting. Start here for components beyond your metal rain tank. Reviews basic design questions.
This will take you to the PDF
Rainwater Harvesting: System Planning. This manual is designed for the professional and reviews every aspect of rainwater harvesting systems. Includes site planning, good design, installation, and maintenance.
Here is a link to buy the manual
Metal Rain Tanks, LLC