Dam Inundation Areas in Napa County as required by the California Office of Emergency Services (Cal OES). Data obtained from California Department of Water Resources (DWR) Division of Safety of Dams (DSOD). DSOD maintains a Dam Breach Inundation Map dataset with links to third party engineering and hydrologic modeling of dam failure scenarios for dams across the state. As required by California Water Code section 6161, DSOD reviews and approves inundation maps prepared by licensed civil engineers and submitted by dam owners for extremely high, high, and significant hazard dams and their critical appurtenant structures. Inundation maps approved by DSOD are a tool used to develop emergency action plans, and the maps are intended to provide general information for emergency planning.