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Sea Level Rise: Threatened Areas Map


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Map Controls
Use these buttons to control the map.
Zoom to the full extent of California
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Switch between area selection types
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Map Animation
Use these buttons to watch the map overlay reflect over time.
  • Click the Play button to begin the animation.
  • Click the Toggle button to alternate between the beginning and end of the available years. The beginning year displays temperature averages projected into the past, and the end year displays temperature averages projected into the future.
  • Use the Slider to control the speed of the animation.
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Timeline
The timeline displays which decade you are currently viewing on the map. You can manually drag the handle to change the year in view.
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Map Legend
The Legend displays the range of values visible on the map overlay for the variable being displayed (temperature degrees, inches of rainfall, area burned, etc).
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Map Magnifier
Click the toggle button on the bottom left corner of the map to view a magnified map. You can drag the magnified map or the magnifying glass on the larger map to explore the region.
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Tool Charts
Click anywhere on the map to see a chart for this area.

Using the Area Selection Type Menu to the left, edit types of selection areas:

  • grid cells, where each cell is an area of 12km x 12km
  • predefined county boundaries

Then click anywhere on the map to automatically change the area described in the chart.

Select various chart options in the dropdown menus to the right, which can include Month, Model, and Temperature ranges (High, Low, or Average).

Note: The first set of chart options control the variables being viewed on the map.

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Add a Chart for comparison

Click "Add Chart" to create an additional chart to compare with. After creating the new chart, click on a new area of the map to view a chart for the same options in another location. Or change an option in the dropdown menu to view the chart for the same location, with different settings.

To edit the first chart again, either directly edit the dropdown menus, or click on the Location Name and then click on a new location on the map.

Click "Predefined boundaries" in the Area Selection Type Menu to the left before clicking on an area of the map, if you'd like to compare counties to one another.

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Lock Location

Fix the locations of the graphs to one area by clicking this toggle.

Elevation:

Sea Level Rise

Global models indicate that California may see up to a 55 inch (140 cm) rise in sea level within this century given expected rise in temperatures around the world.  The following map tool displays areas that may be in threat of inundation during an extreme flood event (100 year flood).  

These data were developed by scientists from the USGS (Bay Area) and Pacific Institute (Coast).  Blue color indicates areas already in threat today, while the lighter shades are area projected to also be in threat given the expected sea level rise.  

These maps do not currently take into account protective structures, such as levees.  New maps are currently being developed by reseachers to include these structures. 

Take a Tour

Additional Sea Level Rise Tools & Resources

A number of tools and models are available for the California coast. A comparison of these tools is available here. The links below connect to externally developed resources.

Create a chart by clicking a location on the map and altering one of the dropdown option boxes.

Uncertainty

The data presented in this tool represent a projection of potential future climate scenarios, they are not predictions. These data are meant to illustrate how the climate may change based on a variety of different potential social and economic factors. The default visualizations in this tool are comprised of the average values from a variety of scenarios and models. Find out more about climate change data.

Disclaimer

This information is being made available for informational purposes only. Users of this information agree by their use to hold blameless the State of California, and its respective officers, employees, agents, contractors, and subcontractors for any liability associated with its use in any form.

This work shall not be used to assess actual coastal hazards, insurance requirements, or property values and specifically shall not be used in lieu of Flood Insurance Studies and Flood Insurance Rate Maps issued by the Federal Emergency Management Agency (FEMA).

Climate Tools


screen shot for the Local Climate Snapshots tool
icon for the Local Climate Snapshots tool
screen shot for the Temperature: Decadal Averages Map tool
icon for the Temperature: Decadal Averages Map tool
screen shot for the Temperature: Degrees of Change Map tool
icon for the Temperature: Degrees of Change Map tool
screen shot for the Temperature: Monthly Averages Chart tool
icon for the Temperature: Monthly Averages Chart tool
screen shot for the Temperature: Extreme Heat Tool tool
icon for the Temperature: Extreme Heat Tool tool
screen shot for the Snowpack: Decadal Averages Map tool
icon for the Snowpack: Decadal Averages Map tool
screen shot for the Precipitation: Decadal Averages Map tool
icon for the Precipitation: Decadal Averages Map tool
screen shot for the Sea Level Rise: Threatened Areas Map tool
icon for the Sea Level Rise: Threatened Areas Map tool
screen shot for the Wildfire: Fire Risk Map tool
icon for the Wildfire: Fire Risk Map tool

Sea Level Rise: Threatened Areas Map

Climate data provided by:

Sea Level Rise logo

U.S. Geological Survey (USGS)

Sea Level Rise

Data Set Contributed: Bay Area Inundation

These layers represent areas around San Francisco Bay at risk of inundation, and correspond to varying amounts of long-term sea level rise (varying over decades) in conjunction with various return levels corresponding to shorter-term variability (hours to years). Most of these areas are currently behind levees or other protective structures, and would only be inundated if those structures were to fail. These data are described in detail in the reference: Knowles, Noah. 2010. Potential Inundation Due to Rising Sea Levels in the San Francisco Bay Region. San Francisco Estuary and Watershed Science, 8:1. Available at

http://escholarship.org/uc/search?entity=jmie_sfews;volume=8;issue=1.

Pacific Institute logo

Pacific Institute

Data Set Contributed: Pacific Institute Coastal Data

These data include areas inundated by 100-year unimpeded Pacific coastal flooding under baseline (year 2000) conditions for the California Coastline, as well as areas inundated by 100-year unimpeded Pacific coastal flooding under a scenario of 1.4-meter (55-inch) sea-level rise.  These data are available for download via the Pacific Institute.

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Shrinking Beaches

2011 April 13

Many of California’s beaches may shrink in the future because of rising seas and increased erosion from winter storms. Currently, many beaches are protected from erosion through manmade sand replenishment (or “nourishment”) programs, which bring in sand from outside sources to replace the diminishing supply of natural sand. In fact, many of the wide sandy beaches in southern California around Santa Monica, Venice, and Newport Beach were created and are maintained entirely by sand nourishment programs. As sea levels rise, increasing volumes of replacement sand will be needed to maintain current beach width and quality. California beach nourishment programs currently cost millions of dollars each year. As global warming continues, the costs of beach nourishment programs will rise, and in some regions beach replenishment may no longer be viable.

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