This shapefile (polygon feature) contains the boundary of the July 1, 2019 100-Year Storm Flood Risk Zone, one of the layers of the July 1, 2019 100-Year Storm Flood Risk Map. The latest adoption FRRM flood map was adopted on July 2020. This adoption was also based on the July 2019 100-Year Storm Flood Risk Map analysis because this represents the latest analysis of the floodplain. No changes have occurred in the geographic extent of the flood plain map since 2019.
Areas within this boundary are highly likely to experience “deep and contiguous” flooding during a 100-year storm. A 100-year storm is a storm that has a 1% chance of occurring in a given year. “Deep and contiguous flooding” means flooding at least 6-inches deep spanning an area at least the size of half an average City block. The 100-Year Storm Flood Risk Zone does not provide the exact depth of flooding at a given location. It also does not show areas in the City that may experience shallower and/or more localized flooding in a 100-year storm, or areas of the City that may flood in storms larger than a 100-year storm. Finally, the 100-Year Storm Flood Risk Zone shows flood risk from storm runoff only. It does not consider flood risk in San Francisco from other causes such as inundation from the San Francisco Bay or Pacific Ocean. In addition to the 100-Year Storm Flood Risk Zone, the 100-Year Storm Flood Risk Map shows other layers. The layer “Areas not served by the Combined Sewer and Stormwater Collection System” shows where data for rainfall driven storm runoff is not available. A group of historical hydrology layers illustrate the general topography of low-lying areas in the City – “Historical Shoreline”, “Historical Creeks”, and “Historical Waterbodies”.
This data originates from San Francisco Bay Conservation and Development Commission's Adapting to Rising Tides Program which performed extensive modelling of expected sea level rise impact across the entire 9-county bay area. This data shows inundation from 24 inches of sea level rise combined with a 100-year storm event (equaling 66 inches of total water level)
This data originates from San Francisco Bay Conservation and Development Commission's Adapting to Rising Tides Program which performed extensive modelling of expected sea level rise impact across the entire 9-county bay area. This data shows inundation from 66 inches of sea level rise combined with a 100-year storm event (equaling 108 inches of total water level)
This map shows the relative likelihood of deep landsliding based on regional estimates of rock strength and steepness of slopes. On the most basic level, weak rocks and steep slopes are more likely to generate landslides. This shows the distribution of one very important component of landslide hazard. It is intended to provide infrastructure owners, emergency planners and the public with a general overview of where landslides are more likely. The map does not include information on landslide triggering events, such as rainstorms or earthquake shaking, nor does it address susceptibility to shallow landslides such as debris flows. This map is not appropriate for evaluation of landslide potential at any specific site.
If gridcode is 8,9,10 than area is High Susceptibility for landslides
This represents projected ground shaking in the City and County of San Francisco during a M7.8 earthquake on the San Andreas fault. The map updated in 2013 by USGS and ABAG. The specific scenario is: M7.8 San Andreas (All Northern Sections). This was used for the 2019 HCR update process.
This dataset displays areas of the city vulnerable to damage from likely tsunami scenarios and displays what can be considered hazard zones of inundation. This data was created by SFDEM in 2015 based on data provided by the following agencies, and imforms evacuation procedures: California Geological Survey and California Governor’s Office of Emergency Services.This was used for the 2019 HCR update process.
Map delineation of the different types and ages of Quaternary deposits supports evaluation of susceptibility to liquefaction. These areas can be expected to experience increased damage from ground shaking during an earthquake. The dataset displays where high and very high liquefaction hazard areas are found. This was used for the 2019 HCR update process.
This represents projected ground shaking in the City and County of San Francisco during a M7.8 earthquake on the San Andreas fault. The map updated in 2013 by USGS and ABAG. The specific scenario is: M7.8 Hayward (North/South Sections). This was used for the 2019 HCR update process.
This data was originally created by FEMA to show the expected extent of coastal flooding expected from a 100-Year storm event. This data was provided to ORCP through DEM. Mapping shows areas determined to be "VE" code by FEMA, meaning: Areas subject to inundation by the 1-percent-annual-chance flood event with additional hazards due to storm-induced velocity wave action. This point in time analysis does NOT consider the influences of Sea Level Rise (SLR)
This map shows the inundation hazard zones from dam and reservoir failure, based on modelling. The analysis was done by SFPUC in partnership with DEM and includes analysis of potential flooding from the following structures: Stanford heights - Agua Way and Teresita Blvd, Summit - La Avanzada St. and Palo Alto Ave., Sunset North - 28th ave and Ortega, Sunset South - 28th ave and Quintara, Sutro - Clarendon ave and Olympia Way, University Mound North - University St and Bacon St., University Mound South - University St. and Bacon St.