POL Government Elected Officials Auditor Mary Hull Caballero Charter, Code & Policies City Code & Charter Online Code & Charter Title 24 Building Regulat Chapter 24.51 Wildfire Hazard Zones
24.51.020 Definitions

(Amended by Ordinance No. 180917, effective May 26, 2007.)  The definitions contained in this Section relate to Wildfire Hazard zones and considerations outlined in this Chapter.
A.   Chief means the Chief of Portland Fire & Rescue or the Chief’s duly authorized representative.
B.  Department of Forestry (DOF) means the State of Oregon Department of Forestry.
C.  Wildfire Hazard Zone means those areas of the City as determined by the Chief that rate a minimum score of 5 or higher using the following criteria developed by DOF:
1.  Topography hazard factor value
2.  Natural vegetative fuel hazard factor value
3.  Natural vegetative fuel distribution hazard factor value
D.  Wildfire Hazard Zone Map means the WHZM attached to Ordinance No. 177433 and as it may be amended from time to time based on the criteria herein.
E.  Hazard Factor. Hazard Factors are topography, certain natural vegetative fuels and natural, vegetative fuel distribution.  Any of these factors, or a combination thereof, may cause an area of the City to be included within a Wildfire Hazard Zone.
F.  Topography Hazard Factor Value means the hazard value as determined by DOF associated with site slope which effects the fire spread velocity.
G.  Natural Vegetative Hazard Factor Value means the numerical value assigned by DOF, extrapolated from the “Aids to Determining Fuel Models for Estimating Fire Behavior” published by the Forest Service, USDA Intermountain Forest and Range Experiment Station in 1982 as General Technical Report INT-122, for various common vegetation.
H.  Natural Vegetative Fuel Distribution Hazard Factor Value means the numerical value assigned by DOF for the percentage of site that is covered by vegetation described in 24.51.020 G.

Title 24 Building Regulat
Chapter 24.10 Administration and Enforcement
Chapter 24.15 Definitions
Chapter 24.20 Special Inspections
Chapter 24.25 Movings of Buildings
Chapter 24.30 Home Occupations
Chapter 24.35 Historical Buildings
Chapter 24.40 Use of and Projections Over Public Streets and Property
Chapter 24.45 Parking and Driveway Surfaces
Chapter 24.50 Flood Hazard Areas
Chapter 24.51 Wildfire Hazard Zones
Chapter 24.55 Building Demolition
Chapter 24.60 Fences
Chapter 24.65 Sidewalk Vault Openings
Chapter 24.70 Clearing and Grading
Chapter 24.75 Uniform Building Address System
Chapter 24.80 (Repealed)
Chapter 24.85 Seismic Design Requirements for Existing Buildings
Chapter 24.90 Manufactured Dwelling Installation and Accessory Structures, Manufactured Dwelling Parks, Recreation Parks, Recreational Park Trailer Installation and Accessory Structures
Chapter 24.95 (Repealed)