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Kittitas County,WA <br /> § 17A.06.020 CRITICAL AREAS § 17A.06.020 <br /> X. Areas that show past sloughing or calving of sediment or rocks resulting in a steep slope <br /> that is poorly vegetated; <br /> xi. Deep-seated landslide areas characterized by one or more of the following features: <br /> scalloped ridge crests at the top of the slope,crescent shaped depressions,head scarps,side <br /> scarps, ponds or sag areas on mid slopes, benches and scarps on mid slope areas, <br /> hummocky ground, linear fractures in the ground. These features may be evident in aerial <br /> images,topographic maps,LiDAR imagery or on the ground; <br /> xii. Areas below unstable slopes or that have been identified as landslide hazard areas that <br /> could be impacted by landslide run out; and <br /> xiii. Areas above or adjacent to unstable slopes that could be impacted if the landslide area <br /> expands. <br /> b. Potential erosion hazard areas.Erosion hazard areas shall include areas containing soils that may <br /> experience significant erosion, including: <br /> i. Soil areas identified by the Natural Resources Conservation Service as having "severe" or <br /> "very severe" erosion hazard. <br /> ii. Slopes forty percent(40%)or steeper with a vertical relief of ten(10)or more feet, except <br /> areas composed of consolidated rock. <br /> iii. Concave slope forms equal to or greater than fifteen percent(15%)with a vertical relief of <br /> ten(10)or more feet, except areas composed of consolidated rock. <br /> iv. Channel migration zones, which are defined as the areas along a river or stream within <br /> which the channel(s)can be reasonably predicted to migrate over time as a result of natural <br /> and normally occurring hydrological and related processes when considered with the <br /> characteristics of the river and its surroundings. <br /> C. Alluvial fan hazard areas. Alluvial fan hazard areas shall include those areas on alluvial fans <br /> where debris flows,debris floods,or clear water floods have the potential to significantly damage <br /> or harm the health or welfare of the community. They include the area generally corresponding <br /> to the path of potential flooding,channel changes,sediment and debris deposition,or debris flow <br /> paths as determined by analysis of watershed hydrology and slope conditions,topography,valley <br /> bottom and channel conditions, potential for channel changes, and surface and subsurface <br /> geology. <br /> i. If the approval authority determines that a proposed use along a Type S or F stream is <br /> within a historic channel migration zone, based on field conditions, historic information, <br /> LIDAR imagery or aerial photography,and the one-hundred-year channel migration hazard <br /> area has not been mapped, the approval authority shall require the applicant to determine <br /> if a one-hundred-year channel migration hazard area is present on the site and, if so, <br /> delineate its location and extent. <br /> ii. The determination as to whether the one-hundred-year channel migration hazard area <br /> affects the subject property shall be based on the findings of a qualified professional <br /> proficient in fluvial geomorphology using a reliable methodology to determine channel <br /> migration accepted by the department(e.g.,as described in the Washington Department of <br /> Natural Resources' Forest Practices Board Manual, Standard Methods for identifying <br /> Channel Migration Zones and Bankfull Channel Features,dated 8/2001,as amended;or in <br /> Downloaded from https:Hecode360.com/KI6857 on 2025-05-15 <br />