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7. CONCLUSION Oroville Dam, the FCO structure, the Emergency Spillway, and the operations plan were designed, developed, and constructed following or exceeding the standard of practice 60 years ago. While the Oroville Project had operated successfully for 49 years, failure of the FCO Spillway chute in 2017 created a need for a new design and an associated operations plan for that design as it was to be constructed in phases. To inform the design and operations, a variety of hydrologic engineering, hydraulic engineering, and reservoir operation analyses were completed during the incident and later as part of the recovery. Conceptual and empirical numerical and physical models were used for the analyses. Analysts encountered problems throughout the analysis, but always found solutions as the models were configured, calibrated, and applied to provide information to design staff and influence interim operation decisions required throughout the response and continuing recovery efforts. REFERENCES [1] United States Army Corps of Engineers (USACE). Oroville Dam and Reservoir report: Reservoir regulation for flood control, August 1970, Sacramento District, Sacramento, CA. [2] TRANSTRUM, L.O. Hydraulic modeling studies of the Oroville Dam spillway, Feather River Project, March 1955. [3] THAYER, D.P., STROPPINI, E.W. “Hydraulic design for Oroville Dam spillway.” Proc., ASCE Hydraulic Conference, Tucson, Arizona, August 25-27, 1965. [4] United States Bureau of Reclamation (USBR). Hydraulic modeling studies of the flood control outlet and spillway for Oroville Dam California, Report No. Hyd-510, 1965, Hydraulic Laboratory, Denver, Colorado. [5] California Department of Water Resources (DWR). “2008 Oroville Dam spillway inspection and condition assessment,” office memorandum, Operation and Maintenance Division, Dam Surveillance Section, April 2008. [6] USACE Hydrologic Engineering Center. River Analysis System (HEC- RAS), 2016, Version 5.0.3, Davis, CA. [7] FLO-2D Software. FLO-2D, 2014, Nutrioso, AZ. 141