EMSWCD » About EMSWCD » Program Resources » Resources – In Your Yard » Resources – Rain Gardens Resources – Rain Gardens Resources and guides related to building a rain garden. You may also want to check out our Maps and Tools section for map tools that provide detailed area information on soil drainage and stormwater. Resources Rain Gardens Guide Rain Garden Brochure Maintaining Rain Gardens, Swales and Stormwater Planters – this document contains more technical information for landscaping and maintenance, particularly for bioswales and green street features. Links to other Resources How to Build a Rain Garden video – from BES Online Rainfall Volume Calculator – this online tool can help you figure out how much runoff your roof (or other impermeable surface) receives. It provides results in English, metric and other types of units.