Page - 69 - in Book of Full Papers - Symposium Hydro Engineering

Fig. 2 2017 Oroville Spillway Recovery design objectives projected onto an aerial view of the damaged spillways at Oroville Dam 2.4. EXPEDITED ALTERNATIVE ANALYSES On March 6, 2017, less than one month after the beginning of the incident, an all-day alternatives workshop was conducted by DWR at the California Natural Resources Building in Sacramento. The purpose of the workshop was to develop reinforcement and replacement alternatives to restore the FCO Spillway chute and the Emergency Spillway to meet the 2017 design objectives by November 1, 2017. Several restoration concepts were proposed for the FCO Spillway chute and for the Emergency Spillway. 2.4.1. FCO Spillway Chute Alternatives The FCO Spillway chute is a reinforced-concrete spillway approximately 54.5 m (179 ft) wide and 914 m (3000 ft) long. Alternatives for the relatively undamaged 488 m (1600 ft) long FCO Spillway upper chute above the scour holes included:  Repair-in-place  Remove and replace  Construct new FCO Spillway upper chute 69