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These data were developed to meet requirements stipulated in Oregon Revised Statute (ORS) 477.015 that Oregon State University develop a map of statewide... |
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These data were developed to meet requirements stipulated in Oregon Revised Statute (ORS) 477.015 that Oregon State University develop a map of statewide... |
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Data developed by Chris Dunn and Andy McEvoy at Oregon State University (andy.mcevoy@oregonstate.edu). |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 11 0;"><SPAN STYLE="font-weight:bold;text-decoration:underline;">Overview</SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN>ORS 477.490 requires Oregon Sate University (OSU) and the Oregon Department of Forestry (ODF) to develop a statewide wildland-urban interface (WUI) map that will be used in conjunction with the statewide wildfire hazard map (ORS 477.490) by the Oregon State Fire Marshal to determine on which properties defensible space standards apply (ORS 476.392) and by the Building Codes Division to determine to which structures home hardening building codes apply (ORS 455.612). </SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN>Rules directing development of the WUI are listed in OAR-629-044-1011 and 629-044-1016. A comprehensive description of datasets and geospatial processing is available at </SPAN><A href="https://hazardmap.forestry.oregonstate.edu/understand-map" STYLE="text-decoration:underline;"><SPAN>https://hazardmap.forestry.oregonstate.edu/understand-map</SPAN></A><SPAN>. The official statewide WUI map is available on the Oregon Wildfire Risk Explorer at </SPAN><A href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftools.oregonexplorer.info%2Fviewer%2Fwildfire&data=05%7C02%7Candy.mcevoy%40oregonstate.edu%7Cf5f0c77c89784a743e9a08dced2e4b4a%7Cce6d05e13c5e4d6287a84c4a2713c113%7C0%7C0%7C638646030280288795%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=5l1Ty51v4J5SOF51IlHyVEW79uKsO1zZbc8NEkmVloc%3D&reserved=0" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>https://tools.oregonexplorer.info/viewer/wildfire</SPAN></SPAN></A><SPAN>. </SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN>Following is an overview of the data and methods used develop the statewide WUI map. </SPAN></P><P><SPAN STYLE="font-weight:bold;text-decoration:underline;">Wildland-Urban Interface</SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN>Creating a statewide map of the WUI involved two general steps. First, we determined which parts of Oregon met the minimum building density requirements to be classified as WUI. Second, for those areas that met the minimum building density threshold, we evaluated the amount and proximity of wildland or vegetative fuels. Following is a summary of geospatial tasks used to create the WUI. </SPAN></P><OL><LI><P><SPAN STYLE="font-weight:bold;">Develop a potential WUI map of all areas that meet the minimum density of structures and other human development - </SPAN><SPAN>According to OAR 629-044-1011, the boundary of Oregon’s WUI is defined in part as areas with a minimum building density of one building per 40 acres</SPAN><SPAN><SPAN>, the same threshold defined in the federal register </SPAN></SPAN><SPAN><SPAN>(Executive Order 13728, 2016)</SPAN></SPAN><SPAN>, and any area within an Urban Growth Boundary (UGB) regardless of the building density. Step One characterizes all the locations in Oregon that could be considered for inclusion in the WUI on building density and UGB extent alone. The result of Step One was a map of potential WUI which was then further refined into final WUI map based on fuels density and proximity in Step Two. </SPAN></P><OL><LI><P><SPAN>Compile statewide tax lots. </SPAN></P></LI><LI><P><SPAN>Map all eligible structures and other human development. </SPAN></P></LI><LI><P><SPAN>Simplify structure dataset to no more than one structure per tax lot</SPAN></P></LI><LI><P><SPAN>Calculate structure density and identify all areas with greater than one structure per 40 acres</SPAN></P></LI><LI><P><SPAN>Add urban growth boundaries to all the areas that meet the density requirements from the previous step.</SPAN></P></LI></OL></LI><LI><P><SPAN STYLE="font-weight:bold;">Classify WUI based on amount and proximity of fuel. </SPAN><SPAN>The WUI is also defined by the density and proximity of wildland and vegetative fuels (“fuels”). By including density and proximity of fuels in the definition of the WUI, the urban core is excluded, and the focus is placed on those areas with sufficient building density </SPAN><SPAN STYLE="font-style:italic;"><SPAN>and </SPAN></SPAN><SPAN>sufficient fuels to facilitate a WUI conflagration. Consistent with national standards, we further classified the WUI into three general classes to inform effective risk management strategies. The following describes how we refined the potential WUI output from step one into the final WUI map.</SPAN></P><OL><LI><P><SPAN>Intermix WUI: </SPAN><SPAN><SPAN>Areas that met the minimum building density threshold in step one </SPAN></SPAN><SPAN STYLE="font-style:italic;"><SPAN>and </SPAN></SPAN><SPAN><SPAN>which had at least 50% vegetative or wildland fuel cover were classified as Intermix WUI</SPAN></SPAN></P></LI><LI><P><SPAN><SPAN>Interface WUI: </SPAN></SPAN><SPAN><SPAN>Interface WUI includes areas that met the minimum building density threshold in step one, </SPAN></SPAN><SPAN STYLE="font-style:italic;"><SPAN>and </SPAN></SPAN><SPAN><SPAN>which had less than 50% vegetative and/or wildland fuel cover but were within 1.5 miles of a large patch (≥ 2 sq. miles) of at least 75% vegetation and/or wildland fuels</SPAN></SPAN></P></LI><LI><P><SPAN><SPAN>Occluded WUI includes areas that met the minimum building density threshold in step one, </SPAN></SPAN><SPAN STYLE="font-style:italic;"><SPAN>and </SPAN></SPAN><SPAN><SPAN>which had less than 50% vegetative and/or wildland fuel cover but were within 1.5 miles of a moderate patch (1 – 2 sq. miles) of at least 75% vegetation and/or wildland fuels.</SPAN></SPAN></P></LI></OL></LI></OL><P><SPAN /></P><P STYLE="margin:0 0 11 0;"><SPAN>Detailed geospatial processing steps are described in the technical guide available at </SPAN><A href="https://hazardmap.forestry.oregonstate.edu/understand-map" STYLE="text-decoration:underline;"><SPAN>https://hazardmap.forestry.oregonstate.edu/understand-map</SPAN></A></P><P /><P><SPAN /></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>This data release represents an official regulatory map for implementing Oregon Revised Statutes (ORS) 476.392 and 455.612. The data were developed by Oregon State University and the Oregon Department of Forestry as required by and in accordance with ORS 477.027 and 477.490. Additional rules guiding development of this data are described in Oregon Administrative Rule (OAR) 629-044-1011 and 626-044-1016 and specific geoprocessing steps are provided in the accompanying report. </SPAN></SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN>Wildland-urban interface boundaries and extents are subject to change if an appeal is successful (see OAR 629-044-1041). </SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>This representation of the wildland-urban interface (WUI) was developed for the specific purpose of supporting statewide defensible space (ORS 476.392) and building code (ORS 455.612) standards for wildfire hazard mitigation. This data was developed to meet the needs of the application described in the previously stated Oregon rules and statues and may not be appropriate for all wildfire hazard planning applications. The user assumes all responsibility for the appropriate use of the information with respect to possible errors, possible omissions, data collection methodology, data currency and other conditions specific to contributing data sources.</SPAN></SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN /></P><P STYLE="margin:0 0 11 0;"><SPAN /></P><P STYLE="margin:0 0 11 0;"><SPAN /></P></DIV></DIV></DIV> |
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Oregon Wildland-Urban Interface (WUI) |
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["Oregon Senate Bill 80","Oregon Senate Bill 762","Oregon Wildfire Hazard Map","Wildfire Hazard Assessment","Wildland-Urban Interface","WUI"] |
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en-US |
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50000000 |
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