On June 27, 2017, Governor Brown signed SB 92 into law, which set forth new requirements focused on dam safety. Part of these new requirements mandate that owners of dams in California develop and submit an emergency action plan, containing certain components and based upon the inundation map or maps approved by the Department of Water Resources. (Gov. Code, § 8589.5.) The owner must submit updated plans every 10 years, or sooner under certain conditions. Cal OES will review and approve the emergency action plans. This legislation set forth additional provisions for emergency action plans including compliance requirements, exercises of the plan, and coordination with local public safety agencies.
More information will be provided as it becomes available
The Cal OES Dam Inundation Mapping & Emergency Procedure (DIMEP) Program was established by Government Code §8589.5 in 1972 following a near failure of the Lower San Fernando Dam during the Sylmar Earthquake. The program provides assistance and guidance to local jurisdictions on emergency planning for dam failure events by:
· Collecting and reviewing dam failure inundation maps · Evaluating waivers from the inundation mapping requirementsThe DIMEP Program coordinates with the California Division of Safety of Dams and other state and federal agencies in activities to assure effective dam incident emergency response procedures and planning.The DIMEP Program is also the designated repository of the official dam failure inundation maps used in California’s Natural Hazard Disclosure statement as specified in Civil Code § 1103 for real estate transactions.
Most dam owners are required to prepare inundation maps as part of the dam permitting process. These maps are prepared by civil engineers on behalf of dam owners, as required under California law. State law requires dam owners to submit inundation maps for approval by Cal OES. Inundation maps are developed from the best available information using reasonable assumptions and standardized methods. The maps are an approximation of the maximum water flow resulting from a complete dam failure. The maps portray a catastrophic failure of the dam, as opposed to the failure a critical appurtenant structure, such as a spillway. This map represents a worst-case scenario contemplating a complete failure of the Oroville Dam. Depending upon actual circumstances, appropriate alert and evacuation areas could be more or less extensive than the simulated zones shown on the maps.
Inundation Map for Oroville Dam 2016
To request dam inundation data, please submit a Public Records Act request. Please contact Jennifer Plescia, Attorney, at (916) 845-8815, or Alex Pal, Attorney, at (916) 845-8973, or send an email to: PRA@caloes.ca.gov.
For other information on the Dam Inundation Mapping & Emergency Procedure Program, contact Lori Newquist at: