The earth dam is located within one quarter mile of the active Hayward Fault. Based on seismic hazard studies, EBMUD worked with the State Department of Water Resources (DWR), Division of Safety of Dams (DSOD) to implement a seismic upgrade to the dam and outlet works structure to improve the performance of the facility during a large earthquake. The project included the construction of a cement deep soil mixing (CDSM) toe buttress and seepage collection trench across the downstream face of the dam in order to stabilize the earthen structure against the large seismic forces expected during the design earthquake. In addition, EBMUD successfully improved the operational reliability of the outlet works by demolishing the seismically vulnerable tower and pavilion, retrofitting the existing access shaft, and replacing the knife gate valves and intake piping needed to manage the water levels within the reservoir. EBMUD also installed new instrumentation to augment the un-going dam monitoring program at the facility. Construction was completed in October 2017.
Laura Luong, Community Affairs Representative
For after-hours, call EBMUD at 866-403-2683.
|Chabot Dam Seismic Upgrade Project Flyer||<1 MB|
|Final Environmental Impact Report; Chabot Dam Seismic Upgrade||8.3 MB|
|Seismic Evaluation of Chabot Tower - Final Report||14.0 MB|
|Draft Environmental Impact Report; Appendices A-C||12.2 MB|
|Draft Environmental Impact Report||16.8 MB|
|Notice of Preparation||<1 MB|
|Dynamic Stability Analysis of Chabot Dam; Volume 2||13.4 MB|
|Notice of Availability||<1 MB|
|Chabot Dam Site Map||<1 MB|
|Map and Cross Section - Chabot Dam||<1 MB|
|Draft Environmental Impact Report; Appendices D-I||25.0 MB|
|Dynamic Stability Analysis of Chabot Dam; Volume 1||17.0 MB|