Posts Tagged: Yana Valachovic
Last week, Governor Gavin Newsom signed a series of bills aimed at improving California's wildfire prevention, mitigation and response efforts. AB 38, a bill aimed at reducing wildfire damage to communities, incorporates University of California research to help protect California's existing housing.
“Prior to AB 38, the State's wildfire building policy focus was centered around guiding construction standards for new homes and major remodels,” said Yana Valachovic, UC Cooperative Extension forest advisor for Humboldt and Del Norte counties. “How do we help incentivize homeowners to upgrade and retrofit the 10 million or more existing homes in California to help them become more resilient to wildfire? AB 38 is an attempt to start that important work and to protect Californians.”
AB 38, introduced by Assemblymember Jim Wood (D-Santa Rosa) provides mechanisms to develop best practices for community-wide resilience against wildfires through “home hardening,” defensible space and other measures based on UC ANR research. This bill is especially important to Wood because wildfires in 2017 destroyed lives and hundreds of homes in his district and because of his work as a forensic dentist following the Santa Rosa and Paradise wildfires.
“AB 38 was a huge effort by many partners as we sought the best policy solutions to address what is today one of our state's biggest challenges,” said Assemblymember Wood. “I could not have accomplished it without the support and guidance of the people at UC Cooperative Extension Humboldt-Del Norte, especially Dr. Steve Quarles and Yana Valachovic. Their expertise proved invaluable as we worked through this process.”
Studies conducted by Steve Quarles, emeritus UC Cooperative Extension advisor, and his continued work at the Insurance Institute for Business and Home Safety have identified building materials and designs that are more resistant to flying embers from wildfires. Embers are small, fiery pieces of plants, trees or buildings that are light enough to be carried on the wind and can rapidly spread wildfire when they blow ahead of the main fire, starting new fires on or in homes.
Evaluating the homes lost in wildfires that ravaged Paradise, Redding and Santa Rosa have also informed Valachovic and Quarles' recommendations.
Hardening a home to withstand wildland fire exposure does not have to be costly, but it does require an understanding of the exposures the home will experience when threatened by a wildfire.
Their recommended best practices for hardening homes against wildfire can be found in UC ANR Publication 8393 “Home Survival in Wildfire-Prone Areas: Building Materials and Design,” which can be downloaded for free. More information is also at the ANR Fire website https://ucanr.edu/fire.
Shades of brown and grey cast over bricks, cement, remnants of metal roofs and steel beams from manufactured and modular homes, collapsed stucco walls, BBQs, shells of washers and driers, along with an occasional tea pot — that is what you can see in and amongst living, but singed Ponderosa pine and California black oak trees where the Camp Fire burned. How did California's most deadly fire happen and what might be done differently to ensure a better outcome? These are difficult questions that California will wrestle with for a long time to come.
Last week I was able to tour some of the burned area in Paradise and Magalia to evaluate why some homes survived and others did not. This gave me a chance to look at homes that survived largely on their material selection, design details, the owner's maintenance efforts, and not necessarily with the aid of a fire crew or resident that stayed. Many of the buildings that were burned were lost on the first day or two of the fire while emergency response was focused on evacuating the communities. It will take months to make sense of this mess and tragedy, but during my tour some conditions rang true to me.
Wildfire is not uniform
Not all fires are the same and not all houses experience the same type of fire. When you are looking at home losses and survivors, keep in mind that each home may not have had the same fire exposure. Some homes experienced significant ember exposure, while others ignited because their neighbor's home succumbed to fire and the heat of their neighbor's house caught their house on fire, while others were protected from the wind and its deadly embers. Paradise and Magalia have blocks and blocks of nothing but foundations, but amongst these bleak conditions are a few intact or partially damaged homes that have a story to tell.
California building code
Wood mulch and landscape plants
Our tour also confirmed that landscaping plants and wood mulch placed right next to the house creates vulnerability. While looking at the rubble of a home, it can be difficult to tell what happened; however, we saw several surviving houses with broken glass or otherwise damaged dual-pane windows that experienced heat exposures sufficient to crack glass in the windows, but the home still survived during these first two days when fire crews were rightly focused on community evacuation and not structure protection. For the houses that did not survive, we can interpret that in addition to the vulnerabilities in vents or a roof, heat can easily break glass in windows, especially if those windows are single pane, and can likely created a pathway for fire to enter the houses.
Home placement makes a difference
A home at the top of a canyon or gulch can easily be overwhelmed by wildfire by taking on additional heat as the fire approaches and being blasted with embers. This is not a new concept, but the homes in the broader Paradise region were especially vulnerable when they were located above these gulches and canyons. Enhanced vegetation management is highly recommended that includes a 5-foot non-combustible zone immediately adjacent to the home.
For me, thinking about Paradise in the abstraction was easy. Visiting it was different. The name says it all. After my visit I could understand why someone would choose Paradise or Magalia; the views are awesome, the air is clear, the forest and woodlands are amazing. I can only imagine that the community was (almost) perfect. Rebuilding a more resilient community will take considerable thought, effort, and some radical new ideas.
The California Natural Resources Agency released California's Fourth Climate Change Assessment today (Monday, Aug. 27), at http://www.ClimateAssessment.ca.gov. UC Agriculture and Natural Resources scientists contributed substantially to the report.
The Fourth Assessment is broken down into nine technical reports on the following topics:
- Biodiversity and habitat
- Forests and wildlife
- Ocean and coast
- Projects, datasets and tools
- Public health
The technical reports were distilled into nine regional reports and three community reports that support climate action by providing an overview of climate-related risks and adaptation strategies tailored to specific regions and themes.
The regional reports cover:
- North Coast Region
- Sacramento Valley Region
- San Francisco Bay Area Region
- Sierra Nevada Region
- San Joaquin Valley Region
- Central Coast Region
- Los Angeles Region
- Inland South Region
- San Diego Region
The community reports focus on:
- The ocean and coast
- Tribal communities
- Climate justice
All research contributing to the Fourth Assessment was peer-reviewed.
UC Cooperative Extension ecosystem sciences specialist Ted Grantham – who works in the Department of Environmental Science, Policy and Management at UC Berkeley – is the lead author of the 80-page North Coast Region Report. Among the public events surrounding the release of the Fourth Assessment is the California Adaptation Forum, Aug. 27-29 in Sacramento. For more information, see http://www.californiaadaptationforum.org/. Grantham is a speaker at the forum.
Other UC ANR authors of the North Coast Region Report are:
- Lenya Quinn-Davidson, UC Cooperative Extension area fire advisor for Humboldt, Siskiyou, Trinity and Mendocino counties
- Glenn McGourty, UC Cooperative Extension viticulture and plant science advisor in Mendocino and Lake counties
- Jeff Stackhouse, UC Cooperative Extension livestock and natural resources advisor for Humboldt and Del Norte counties
- Yana Valachovic, UC Cooperative Extension forest advisor for Humboldt and Del Norte counties
UC Cooperative Extension fire specialist Max Moritz contributed to sections of the main report on Forest Health and Wildfire and to the San Francisco Bay Area Report.
UC ANR lead authors of technical reports were:
- Economic and Environmental Implications of California Crop and Livestock Adaptations to Climate Change, Daniel Sumner, director of UC ANR's Agricultural Issues Center
- Climate-wise Landscape Connectivity: Why, How and What Next, Adina Merenlander, UC Cooperative Extension specialist
- Visualizing Climate-Related Risks to the Natural Gas System Using Cal-Adapt, Maggi Kelly, UC Cooperative Extension specialist
Preventing embers from getting inside may save homes
Photos and video of the Northern California communities that have been hit by wildfires this week show buildings reduced to ash. How could so many homes and businesses burn so quickly in Wine Country fires? Many houses that burned to the ground in the Northern California fires likely burned from the inside out, says Yana Valachovic, UC Cooperative Extension forest advisor for Humboldt and Del Norte counties.
Red hot embers carried on the wind can enter the attic via the venting. “In the case of the wind-driven fires on October 8, these fires created ember storms that blasted little coals into everything in their pathway,” Valachovic said. These embers also create small spot fires near the home that fuel new sources of embers.
Weather played a large role in these fires and generated a fire storm of embers that ignited grass, shrubs, trees and anything in its path. “While the landscape can be the fuse, the homes really can be the most burnable part of the landscape,” Valachovic said. “These embers likely lodged in the small spaces and openings of homes and buildings. A common location is for the embers to enter via attic venting or HVAC systems distributing little fires into the buildings.
“Embers also landed on receptive leaves, outside furniture, and other flammable materials outside the buildings that created fires adjacent to the buildings. Once enough buildings were engulfed in fire, the radiant heat of each building fire led to exposures on the neighboring buildings, creating a house-to-house burn environment.”
Residents can reduce the risk of embers setting their house on fire by removing dry plants around the structure.
“These fires remind us that everyone in California could help the fire situation by managing the vegetation, leaves in the gutters and decks, newspaper piles, brooms and other flammable sources near to their houses now before they get the evacuation call,” Valachovic said. “If you are likely to have to evacuate soon, temporarily covering or sealing up the vents with metal tape or plywood can help harden your home to an ember storm.”
Steve Quarles, UC Cooperative Extension advisor emeritus, who spent his career studying fire behavior on building materials and around homes, created an online Homeowner's Wildfire Mitigation Guide at http://ucanr.edu/sites/Wildfire. Quarles, who now does research for the Insurance Institute for Business and Home Safety, demonstrates how embers can ignite and quickly engulf a house in flames in a video https://www.youtube.com/watch?v=IvbNOPSYyss. After the 3-minute mark, video shows embers drifting up and flying through a screened vent into the house, where they could ignite combustible materials in the attic resulting in fire starting on the inside of the home.
“If you have time to prepare your home, use the wildfire last-minute check list at http://disastersafety.org/wp-content/uploads/2016/07/IBHS-Wildfire-Last-Minute-Checklist.pdf,” Valachovic said.
Valachovic has co-authored publications in home survival in wildfire prone areas http://anrcatalog.ucanr.edu/pdf/8393.pdf and how landscape plants near homes can create more vulnerability to wildfire http://anrcatalog.ucanr.edu/pdf/8228.pdf.
Once these fires are extinguished, a more detailed analysis will be possible.
“Past wildfire events have shown that this is the common way homes in the wildland urban interface (WUI) burn, and this scenario was likely translated to the urban environment,” she said.
Foresters, landowners, managers, community and conservation groups, land trustees, scientists and policymakers will meet Sept. 13 to 15 in Eureka for the 2016 Coast Redwood Science Symposium.
The symposium, which first convened in Humboldt County in 1996, will feature 70 speakers, 25 poster presentations and three field trips to explore the redwood forests of the North Coast.
“The general public may be interested in attending this conference because it provides a look at the current state of redwood forest management,” said Yana Valachovic, University of California Cooperative Extension forest advisor for Humboldt and Del Norte counties. “This symposium will allow attendees to learn more about how forests are managed today and see the tremendous changes in both private and public land management.”
From Brookings, Ore., to Big Sur, redwoods grow in a variety of habitats and conditions. On the field trips, participants will get to see both conservation and industrial aspects of old growth and timber forests.
A lot can be learned from both private and public land-management strategies and it is critical that the policies and strategies guiding use and management within the redwood region be reviewed and updated based on objective, scientific information, said Valachovic.
“We will discuss changes in milling, manufacturing and energy-producing facilities within the redwood range,” said Valachovic. “Over the last 20 years, there has been a great reduction in these facilities and this comes with a cost because the same infrastructure that supports lumber manufacturing also supports restoration activities.”
In the wake of several catastrophic wildfires this summer, it has been widely publicized that drought, disease and insects have killed more than 66 million trees in California. One place to dispose of dead trees is biomass power plants, which burn low-value forest materials to generate energy for homes and businesses. At the symposium, participants will discuss the impact of recent closures of bioenergy or biomass power plants.
On Wednesday, Sept. 14, three full-day tours are offered:
- North Tour. Redwood National and State Parks and Green Diamond Resource Company will highlight redwood thinning practices. The tour will travel north to the Orick area of Redwood National and State Parks to look at restoration forestry practices designed to enhance structural diversity of younger even-aged forests. The afternoon will be spent walking in the Korbel area, viewing Green Diamond's commercial thinning of third-growth forests and wildlife management strategies in managed landscapes.
- South Tour. The tour with Humboldt Redwood Company looks into conservation planning on industrial timberland. In the historic lumber town of Scotia, participants will tour a mill and visit Humboldt Redwood Company's 40,000 gallon freshwater aquarium. In the afternoon, the tour will hear about active forest management and habitat conservation strategies for the protection of endangered species such as the marbled murrelet, northern spotted owl, and coho, chinook and steelhead salmon.
“This symposium will build on the scientific underpinnings from the first redwood symposium held in Arcata in 1996 and the subsequent 2004 symposium in Rohnert Park, and the 2011 symposium in Santa Cruz,” said Valachovic. “Bringing the symposium back to Humboldt is a great homecoming. Much has changed over the last 20 years.”
The 2016 Coast Redwood Science Symposium, sponsored by UC Agriculture and Natural Resources, will be held at the Red Lion Inn in Eureka. For more information or to register, visit http://ucanr.edu/sites/Redwood2016.