Stormwater becomes a serious problem in increasing flooding in urban areas and polluting watershed. Quantity and quality of stormwater runoff are two main concerns in stormwater management. Currently, LEED and Greenroads systems provide credits and requirements relevant to the stormwater design in quantity and quality control to help projects success in managing stormwater. The method used to control volume or treat pollutants of stormwater runoff are called stormwater best management practices (BMPs).
This research examined necessary details in planning and established a procedure for stormwater design. It analyzed manuals, guidelines and case studies from the U.S. Environmental Protection Agency and LEED’s projects to determine factors affecting BMP selection process and propose the common BMPs used in green buildings. The data and equations needed to calculate quantity and quality of runoff to meet the credits were provided according to the requirements of LEED and Greenroads. The procedure for planning in stormwater design was established based on the previous results in factors, common BMPs and data required. Three case projects in North Carolina, Washington and Taiwan were used to examine the procedure. Projects can earn the relevant credits in LEED if they follow four steps of the procedure and have needed data and guidelines.
The research also proposed the difficulties in data availability and lack of knowledge in design after using the procedure on three cases. The solutions to these difficulties were also proposed. The government should play the lead role in directing research to collect data and provide guidelines about stormwater management. In addition, education is a good solution to improve awareness for project participants.

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