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OROVILLE DAM SPILLWAY INCIDENT — HYDROLOGIC AND HYDRAULIC ENGINEERING ACTIVITIES TO INFORM OPERATION AND DESIGN* Ganesh Pandey Supervising Engineer, State of California, Department of Water Resources David FORD Oroville Spillway Restoration Hydrology Team Lead, David Ford Consulting Engineers, Inc. Ted Craddock Oroville Spillways Project Manager, State of California, Department of Water Resources Molly White Supervising Engineer, State of California, Department of Water Resources Mark Fortner Oroville Spillway Restoration Hydraulic Team Lead, GEI Consultants, Inc. John Leahigh Principal Engineer, State of California, Department of Water Resources Mike Anderson State Climatologist, State of California, Department of Water Resources UNITED STATES OF AMERICA 1. INTRODUCTION Oroville Dam is located on the Feather River in northern California (USA). At 234.7 m (770-ft) tall, this earth embankment is the tallest dam in the United States. With its 4.3 billion m3 (3.5 million acre-feet) of storage, Lake Oroville is the second largest reservoir in California, supplying water to cities as far south as Los Angeles. The Oroville Dam, reservoir (Lake Oroville), and hydropower plant facility is the flagship of the State Water Project (SWP), which is owned and operated by the State of California, Department of Water Resources (DWR). *OROVILLE BARRAGE RÉPONSE D'URGENCE ET RESTAURATION DE DÉVERSEMENT - ACTIVITÉS D'INGÉNIERIE HYDROLOGIQUE ET HYDRAULIQUE POUR INFORMER LE FONCTIONNEMENT ET LA CONCEPTION 124