A. Wildfire Hazard
Zone Map Adoption.
1. A Wildfire Hazard
Zone Map (WHZM) has been developed for the City of Portland through a review
of topography, weather, type vegetation and fuel density. This map is dated
October 11, 2002.
2. The WHZM dated
October 11, 2002, is hereby adopted by reference and incorporated into this
3. The Chief shall provide the Director with a copy of the official map adopted in Subsection one of this Section. Copies of the map shall be available for review in the Development Services Center, First Floor 1900 SW 4th Avenue, Portland Oregon.
B. Revisions to the
Wildfire Hazard Zone Map.
1. The WHZM may be
amended from time to time to either include or exclude properties as the facts
2. The Chief shall
have the authority to revise the Wildfire Hazard Zone Map.
3. All Wildfire
Hazard Zone map revisions shall be determined using the criteria set forth
below. Any site having a cumulative hazard value of five (5) or more shall be
included in a wildfire hazard zone.
Hazard Factor Value. The topography hazard value shall be calculated as
site slope using the appropriate 7.5 minute quadrangle map published by
the U.S. Geological Survey, USDI.
appropriate hazard value using Table
Vegetative Fuel Hazard Factor Value. The natural vegetative fuel hazard
value shall be calculated as follows:
(1) Divide the
jurisdiction into geographic areas which best describe the natural
vegetation expected to occupy sites for the next 10 to 15 years.
(2) Select the
appropriate hazard value from Table
Vegetative Fuel Distribution Hazard Factor Value . To determine the natural
vegetative fuel distribution hazard factor value:
the percentage of each individual area that is covered by vegetation.
(2) Using the
calculated percentage, assign a value using Table