20201024
07181300
1.0
FGDC CSDGM Metadata
TRUE
Priority properties for debris flow management in 2020 Holiday Farm Fire area.<div><br /></div><div><div>EWEB desired a prioritization analysis for private taxlots in (and near) the Holiday Farm Fire burn area in order to help guide their efforts to do on the ground assessments for erosion control/stabilization work (and other assessments) related to minimizing impact to water quality from the fire.</div><div><br /></div><div>The details of the model that produced this layer are given below. Basically, the model selects eligible (mostly private) properties that are within the Holiday Farm Fire burn area plus a one mile buffer and also in the McKenzie River watershed above the EWEB drinking water intake. These properties are evaluated against the following layers: the USGS post-fire debris flow likelihood/volume combined risk dataset <a href='https://landslides.usgs.gov/hazards/postfire_debrisflow/detail.php?objectid=339' rel='nofollow ugc' target='_blank'>https://landslides.usgs.gov/hazards/postfire_debrisflow/detail.php?objectid=339</a>), distance from the McKenzie River and tributary streams, lot size, burn severity, and presence of structures and burned structures in a weighted model to derive the priority value (1 – 17, with 1 being highest priority to assess).</div><div><ul><li>Industrial forest lands (F1 zoning) and public lands, with the exception of Lane County Parks, were excluded.<br /></li><li>Priority was calculated using a raster analysis.</li><li>Priority is based on a weighted average of factors by taxlot. The highest weighted average is given the highest priority (lowest priority number).</li><li>Four factors were calculated as index grids with values that ranged from 1 to 3, with 3 being the greatest impact.</li><ul><li>Impact of USGS post-fire debris flow likelihood/volume combined risk (substituting burn severity where debris flow risk values were not available)</li><ul><li>(Weight = 2)</li><li>1: Low</li><li>2: Moderate</li><li>3: High</li></ul><li>Impact of distance from NHD tributary stream or larger water body (i.e. the river)</li><ul><li>(Weight = 3)</li><li>1: Low/Farther (> 120’)</li><li>2: Moderate/Near (60’-120’)</li><li>3: High/Very Near (0’-60’)</li></ul><li>Impact of lot size</li><ul><li>(Weight = 1)</li><li>1: Low/Farther (> 120’)</li><li>2: Moderate/Near (60’-120’)</li><li>3: High/Very Near (0’-60’)</li></ul><li>Impact of presence of structures or burned structures from OSFM 1st pass assessment</li><ul><li>(Weight = 1)</li><li>1: Low/No Structure Present</li><li>2: Moderate/Structure Present</li><li>3: High/Burned Structure Observed</li></ul></ul></ul><div><br /></div></div></div>
Priority
properties
debris flow
Priority properties for debris flow management in 2020 Holiday Farm Fire area.
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