System manuals: The Texas Manual on Rainwater Harvesting (PDF)
Rainwater Harvesting - Free listings
Wahaso - Water Harvesting Solutions, is a design-build firm specializing in custom commercial systems for harvesting rainwater, greywater (graywater) and other on-site water sources for non-potable uses like toilet flushing, irrigation and evaporative cooling system make-up. Wahaso provides consulting and system design services to engineers and architects and then delivers systems that are preassembled and tested on skids for installation by local contractors. The company was founded in 2008 and has designed systems for nearly 400 projects in the US and Canada.