Community exposure in Los Angeles County to coastal flooding hazards

based on storm and sea level rise scenarios

Nathan Wood Jeanne Jones Peter Ng Kevin Henry Jamie Jones Jeff Peters Nina Abdollahian USGS Western Geographic Science Center

U.S. Department of the Interior U.S. Geological Survey

www.usgs.gov/apps/hera

Community Exposure to Coastal Hazards in California

Maps of Flood Hazard Zones

Maps of Flood Hazard Zones

Providing Guidance on SLR Scenarios

Demography

Source - 2010 Census blocks Attributes: • Total residential population • Age – < 5 years and > 65 years • Ethnicity – Hispanic • Race – American Indian, Asian, Black or African American, Native Hawaiian or Pacific Islander, White, Other

• Occupancy – renters, homeowners • Group quarters – institutionalized, non-institutionalized

Current conditions (i.e., no storm)

Economic assets

• Employees: Government, Manufacturing,

Natural Resources, Services, Trade

• Parcel values – improved, land

• Building replacement value: Agriculture,

Commercial, Education, Government, Industrial,

Religious facility, Residential

Current conditions (i.e., no storm)

Infrastructure

• Roads – highways, secondary streets, surface streets

• Railroads • Critical facilities

• Fire stations, Hospitals, Medical facilities, Medical clinics, Medical services, Police stations, Schools

Current conditions (i.e., no storm)

Land Cover

Developed land (NLCD)

Wetlands (NLCD)

Current conditions (i.e., no storm)

Los Angeles County

Uncertainty extent: maximum minimum

Comparative Metrics – number vs. community percentage of asset in hazard zone

Malibu 765 residents 6% in zone

Long Beach 15,676 residents 3% in zone

Comparative Metrics – impact of sea level rise

100 year storm, no SLR 100 year storm, 100 cm SLR

Data tables

• Provides the user with the ability to: • Examine flooding hazard exposure for an individual community • Explore changes in community exposure given multiple coastal storm and SLR scenarios • Compare the exposure of multiple communities

• Interactive maps , charts, and graphics visualize exposure in hazard zones of:

• Populations • Economic assets • Land cover • Infrastructure

• For more information

• Jeanne Jones (lead HERA developer) – jmjones@usgs.gov • Nathan Wood (principal investigator) – nwood@usgs.gov • HERA web application - www.usgs.gov/apps/hera • Project background - https://geography.wr.usgs.gov/science/vulnerability/HERA.html

Summary for HERA