The Flood Management Design Manual (FMDM) is intended to be used to guide public agencies and private entities in Sonoma County that are planning, designing, constructing or maintaining waterways, channels, closed conduits or culverts. It provides methods and criteria for analyzing storm drain systems and facilities that are necessary to convey rainfall run-off due to large storm events. The FMDM will replace the current Sonoma County Water Agency Flood Control Design Criteria (FCDC) last revised in 1983 and has been a reference tool used throughout the County since 1966.
Sonoma Water plans to implement the new FMDM on January 1, 2020.
