NATURAL RESOURCES DEFENSE COUNCIL, INC.; Santa Monica Baykeeper, Plaintiffs–Appellants, v. COUNTY OF LOS ANGELES; Los Angeles County Flood Control District; Michael Antonovich, in his official capacity as Supervisor; Yvonne Burke, in her official capacity as Supervisor; Gloria Molina, in her official capacity as Supervisor; Zev Yaroslavsky, in his official capacity as Supervisor; Dean D. Efstathiou, in his official capacity as Acting Director of Los Angeles County Department of Public Works; Don Knabe, in his official capacity as Supervisor, Defendants–Appellees.