Wildland Urban Interface
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We have been studying the WUI in the U.S. for more than 10 years, looking at where WUI areas were once located, where they are now, and where we expect them to be in the coming decades. Our new data set provides the first high-resolution data on WUI change from 1990 to 2010, revealing how housing growth and wildland vegetation have combined over time. We developed new algorithms that converted the decennial Census standalone data into a consistent dataset on housing growth across the conterminous U.S.
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The WUI in the United States grew rapidly from 1990 to 2010 in terms of both number of new houses (from 30.8 to 43.4 million; 41% growth) and land area (from 581,000 to 770,000 km2; 33% growth), making it the fastest-growing land use type in the conterminous United States. The vast majority of new WUI areas were the result of new housing (97%), not related to an increase in wildland vegetation. Within the perimeter of recent wildfires (1990–2015), there were 286,000 houses in 2010, compared with 177,000 in 1990. Furthermore, WUI growth often results in more wildfire ignitions, putting more lives and houses at risk. Wildfire problems will not abate if recent housing growth trends continue.
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This study found evidence of a gap between risk perceptions of WUI residents and wildfire professionals. On average, residents underestimated the overall risk of their property. One third of the study participants reported having a neighbor that they think is increasing their risk. Perceived likelihood of fire reaching the property and causing damages was positively correlated with perceiving a neighbor is not taking action. The only consistent predictor of defensible space was the level of defensible space on neighboring properties. Our results suggest that programs that are effective in getting single homeowners to mitigate risk may have benefits that spillover to neighboring properties, and risk neutral/tolerant individuals lived on parcels that were rated by the professional as having less defensible space and more ignitable structure materials.
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Becoming a fire-adapted community that can live with wildfire is envisioned as a continuous, iterative process of adaptation. Miranda Mockrin, a research scientist with the Forest Service combined national and case study research to examine how experience with wildfire alters the built environment and community- and government-level wildfire mitigation, planning, and regulations. Research suggests that adaptation to wildfire through WUI regulations depends on multiple factors, including past experience with fire and the geographic extent and scale of the fire event relative to the local community and its government. While communities did not often pursue changes in WUI regulations, experience with wildfire was frequently cited as the impetus for other adaptive responses, such as improving emergency response or fire suppression, and expanding education and interaction with homeowners, such as Firewise programs or government support for fuel mitigation on private lands.
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In 2004, the Communities Committee of the Seventh American Forest Congress, Society of American Foresters, National Association of Counties, and the National Association of State Foresters sponsored and developed a handbook entitled Preparing a Community Wildfire Protection Plan. (Communities Committee of the Seventh American Forest Congress; Society of American Foresters; National Association of Counties; National Association of State Foresters, 2004) This guide is intended to supplement that handbook, with special considerations for local fire service leaders in communities identified as at-risk of wildfire. While adjacency to public lands (forests, brushlands and grasslands) can impact wildfire risk, there are ways to impact and reduce wildfire risk from within the community as well. This includes a focus on local codes and ordinances, home ignition Zones, defensible space, ignition-resistant construction and design standards, as well as hazardous fuels reduction in parks, common-owned areas, and open spaces within the local jurisdiction.
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Conditions such as dense vegetation and drought have resulted in more severe wildland fires in recent years, and some communities are experiencing the devastating effects of these fires. Federal agencies can collaborate with nonfederal stakeholders to reduce the risk of wildland fires. This is a key aspect of the National Cohesive Wildland Fire Management Strategy. The Government Accountability Office recommends that federal agencies work with the Wildland Fire Leadership Council—which provides oversight and leadership for the strategy—to develop measures to assess progress toward achieving the strategy’s goals.
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This study suggests that policy and management have focused primarily on specified resilience approaches aimed at resistance to wildfire and restoration of areas burned by wildfire through fire suppression and fuels management. These strategies are inadequate to address a new era of western wildfires. In contrast, policies that promote adaptive resilience to wildfire, by which people and ecosystems adjust and reorganize in response to changing fire regimes to reduce future vulnerability, are needed.
Key aspects of an adaptive resilience approach are:
- recognizing that fuels reduction cannot alter regional wildfire trends;
- targeting fuels reduction to increase adaptation by some ecosystems and residential communities to more frequent fire;
- actively managing more wild and prescribed fires with a range of severities;
- incentivizing and planning residential development to withstand inevitable wildfire.
These strategies represent a shift in policy and management from restoring ecosystems based on historical baselines to adapting to changing fire regimes and from unsustainable defense of the wildland–urban interface to developing fire-adapted communities. We propose an approach that accepts wildfire as an inevitable catalyst of change and that promotes adaptive responses by ecosystems and residential communities to more warming and wildfire.
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The Community Planning Assistance for Wildfire (CPAW) program provides communities with expertise in land use planning, forestry, risk assessment, and research to identify and reduce local wildfire risks and costs. Learn even more background and access other tools at Headwaters Economics.
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The Sage Grouse Initiative Interactive Web App is a tool to catalyze and improve habitat conservation efforts across the western United States. It presents cutting-edge geospatial data covering 100 million acres, which helps visualize, distribute, and interact with information about the sagebrush-steppe ecosystem.
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This study proposes using the principles of risk analysis to provide land management agencies, first responders, and affected communities who face the inevitability of wildfires the ability to reduce the potential for loss. Overcoming perceptions of wildland urban interface fire disasters as a wildfire control problem rather than a home ignition problem, determined by home ignition conditions, will reduce home loss.