watervulnerability

Umatilla National Forest Watershed Vulnerability Assessment, Pacific Northwest Region (R6)
Value-Risk Matrix
Low Risk/Value High
Rank L ML M MH H Rank
High 7 M MH H H H 7 High
Vulnerability
6 ML M MH H H 6
5 ML ML M MH MH 5
4 L L ML M MH 4
217 Assessing the Vulnerability of Watersheds to Climate Change
Vulnerability
Low 3 L L L ML M 3 Low
Rank L ML M MH H Rank
Low Risk/Value High
Exposure was ranked from 3 to 7 and categorized as follows: 0-3=L; 4=ML; 5=M; 6=MH; 7=H.
Data were categorized into 5 categories for values, sensitivity, and exposure, but were simplified into 3
categories for the composite relative watershed vulnerability using the matrix.
The composite analysis included all resource values and sensitivity and climate factors, to produce a
composite relative watershed vulnerability rating. Two individual coarse-scale analyses were also
performed to assess relative vulnerability of individual values for aquatic species and infrastructure in a
similar process; however, only individual values and stressors and climate variables that could affect
those individual values were included in the analysis.
Individual Value Ranking: Infrastructure Vulnerability
Infrastructure vulnerability (see figure below) was assessed using high-value developments
(campgrounds, guard stations, and other buildings) as the value metrics. Sensitivity and vulnerability
factors included in the analysis were similar to those used in composite analysis, with the exclusion of
roads and developments. Change in SWE was the only climate factor used to assess exposure; changes in
summer and winter temperature are not expected to have a direct effect on infrastructure and
development.