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A rain garden for the purposes of stormwater management for a proposed land development is something that can be designed by a civil engineer. However, there are also rain gardens that can be designed and installed by individual homeowners as a way to collect and use rainwater.
The following are two rain garden books that I would recommend.
1) Rain Gardens: Sustainable Landscaping for a Beautiful Yard and a Healthy World by Lynn M. Steiner and Robert W. Domm
2) Creating Rain Gardens by Cleo Woelfle-Erskine and Apryl Uncapher
This is good reference regarding the design of rain gardens for the back yard of individual homes.