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Kittitas County Shoreline Master Program <br />g. Areas that show evidence of, or are at risk from snow avalanches; <br />h. Areas located in a canyon or on an active alluvial fan, presently or potentially <br />subject to inundation by debris flows or catastrophic flooding; andi. Any area with a slope of forty percent (40o/o) or steeper and with a vertical relief <br />of ten (10) or more feet except areas composed of bedrock. A slope is delineated <br />by establishing its toe and top and measured by averaging the inclination over at <br />least ten (10) feet of vertical relief. <br />3. Classification: Erosion hazard areas - areas containing soils that may experience <br />signifi cant erosion, including : <br />a. Slopes forty percent (a0%) or steeper with a vertical relief of ten (10) or more <br />feet, except areas composed of consolidated rock. <br />b. Concave slope forms equal to or greater than fifteen percent (15%) with a vertical <br />relief of ten (10) or more feet, except areas composed of consolidated rock. <br />c. Channel migration zones: Areas within which the stream channel can reasonably <br />be expected to migrate over time as a result of normally occurring hydrological <br />and related processes when considered with the characteristics of the river and <br />its surroundings. Such hazards are characterized by abandoned channels, <br />ongoing sediment deposition and erosion, topographic position, and changes in <br />the plant community, ?g€, structure and composition. <br />4. Classification: Seismichazard areas - lands subject to severe risk of damage as a <br />result of earthquake induced ground shaking, slope failure, settlement, soil <br />liquefaction, or surface faulting the following classifications shall be designated as <br />seismic hazard and are subject to the requirements of this Section. <br />5. Classification: Volcanichazard areas - areas subject to pyroclastic flows, lava flows, <br />debris avalanche, inundation by debris flows, mudflows, or related flooding resulting <br />from volcanic activity. There are no active or dormant volcanoes located within <br />Kittitas County; however Mount Rainer and Mount St. Helens are relatively near. <br />Hazards to Kittitas County residents from these volcanoes are limited to ash <br />deposition. <br />6. Classification: Mine hazards areas - areas underlain by abandoned mine shafts, <br />secondary passages between shafts tunnels, or air vents. Mine hazards include <br />subsidence, which is the uneven downward movement of the ground surface caused <br />by underground workings caving in; contamination to ground and surface water from <br />tailings and underground workings; concentrations of lethal or noxious gases; and <br />underground fires. <br />7. Mapping: The approximate location and extent of geologically hazardous areas are <br />shown on maps maintained by the County. These maps shall be advisory and used <br />by the Administrator to provide guidance in determining applicability of the standards <br />to a property. These maps shall be updated periodically as new information <br />becomes available. <br />Chapter 5 <br />March 7,2016 <br />79