Pictured is Whittier Narrows Dam, a flood-risk management and water-conservation project that serves as a central element of the Los Angeles County Drainage Area flood control system. With the help this dam and three others in the Los Angeles District’s inventory, stakeholders in Southern California captured approximately 30,000-acre feet of stormwater runoff valued at $25 million for local groundwater replenishment during heavy rainfall in December 2021.