GSI City Details and Specifications



Lotus worked closely with a leading team of consultants and the SFPUC Urban Watershed Management Program to develop typical plans and specifications for Green Infrastructure (GI) facilities that manage stormwater within the City and County of San Francisco. The Typical GI Details and Specifications aim to assist public and private sector design teams in developing construction level GI designs that meet regulatory standards. These guidance documents incorporate the latest national best practices, while taking into consideration San Francisco’s two types of collection systems (combined and separate storm sewer systems) and the City’s varied physical and environmental conditions. The first two phases of the details and specifications focus on the most common technologies used in the City’s urban conditions: bioretention, permeable pavement, and subsurface infiltration systems. The specifications were developed in coordination with various City agencies, industry experts, local contractors, and regional suppliers. Version 2, released in 2016, is a comprehensive and user-friendly manual that is now serving as a new national model for green infrastructure design in metropolitan areas. Several Bay Area municipalities are using this set of typical details and specifications as the key reference point in the development of their own details, specifications, and designer guidance manuals.

Due to previous and current involvement with other SFPUC programs such as the Stormwater Design Guidelines, BMP Fact Sheets, the Sewer System Improvement Program Early Implementation Projects, and GI Construction Training, Lotus Water was able to apply their expertise in the creation of the typical plans and details that are consistent with City regulations, practices, and goals, while considering lessons learned of early GI construction projects within the City.