A rain garden is a planted depression that allows rainwater runoff from impervious urban areas like roofs, driveways, 
walkways, and compacted lawn areas the opportunity to be absorbed (wikipedia). This article will take you to a brochure contains materials about how to create a rain garden you can download.
What you will see in this brochure are sections described What Is a Rain Garden, Where Are The Best Places to Locate Rain Gardens, Where Are Rain Gardens Not Beneficial, Step by step for how to create, Why Plant a Rain Garden, How Do Rain Gardens Work, and Tips for finding well-suited plants you should use in their common and scientific names (trees, shrubs, perennials, grasses and groundcovers).
Further details on Creating Rain Garden for DIY Homeowner can be download here in how-to guide brochure of pdf filetype (source: epa.gov)
