SMP Ordinance Exhibits - Laserfiche WebLink

Home Browse Search

Kittitas County Shoreline Master Program Chapter 5 79 March 7, 2016 g. Areas that show evidence of, or are at risk from snow avalanches; h. Areas located in a canyon or on an active alluvial fan, presently or potentially subject to inundation by debris flows or catastrophic flooding; and i. Any area with a slope of forty percent (40%) or steeper and with a vertical relief of ten (10) or more feet except areas composed of bedrock. A slope is delineated by establishing its toe and top and measured by averaging the inclination over at least ten (10) feet of vertical relief. 3. Classification: Erosion hazard areas – areas containing soils that may experience significant erosion, including: a. Slopes forty percent (40%) or steeper with a vertical relief of ten (10) or more feet, except areas composed of consolidated rock. b. Concave slope forms equal to or greater than fifteen percent (15%) with a vertical relief of ten (10) or more feet, except areas composed of consolidated rock. c. Channel migration zones: Areas within which the stream channel can reasonably be expected to migrate over time as a result of normally occurring hydrological and related processes when considered with the characteristics of the river and its surroundings. Such hazards are characterized by abandoned channels, ongoing sediment deposition and erosion, topographic position, and changes in the plant community, age, structure and composition. 4. Classification: Seismic hazard areas – lands subject to severe risk of damage as a result of earthquake induced ground shaking, slope failure, settlement, soil liquefaction, or surface faulting the following classifications shall be designated as seismic hazard and are subject to the requirements of this Section. 5. Classification: Volcanic hazard areas – areas subject to pyroclastic flows, lava flows, debris avalanche, inundation by debris flows, mudflows, or related flooding resulting from volcanic activity. There are no active or dormant volcanoes located within Kittitas County; however Mount Rainer and Mount St. Helens are relatively near. Hazards to Kittitas County residents from these volcanoes are limited to ash deposition. 6. Classification: Mine hazards areas – areas underlain by abandoned mine shafts, secondary passages between shafts tunnels, or air vents. Mine hazards include subsidence, which is the uneven downward movement of the ground surface caused by underground workings caving in; contamination to ground and surface water from tailings and underground workings; concentrations of lethal or noxious gases; and underground fires. 7. Mapping: The approximate location and extent of geologically hazardous areas are shown on maps maintained by the County. These maps shall be advisory and used by the Administrator to provide guidance in determining applicability of the standards to a property. These maps shall be updated periodically as new information becomes available.