Exhibit A KCC 17A Revisions - Laserfiche WebLink

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Kittitas County, WA § 17A.06.020 CRITICAL AREAS § 17A.06.020 Downloaded from https://ecode360.com/KI6857 on 2025-05-15 x. Areas that show past sloughing or calving of sediment or rocks resulting in a steep slope that is poorly vegetated; xi. Deep-seated landslide areas characterized by one or more of the following features: scalloped ridge crests at the top of the slope, crescent shaped depressions, head scarps, side scarps, ponds or sag areas on mid slopes, benches and scarps on mid slope areas, hummocky ground, linear fractures in the ground. These features may be evident in aerial images, topographic maps, LiDAR imagery or on the ground; xii. Areas below unstable slopes or that have been identified as landslide hazard areas that could be impacted by landslide run out; and xiii. Areas above or adjacent to unstable slopes that could be impacted if the landslide area expands. b. Potential erosion hazard areas. Erosion hazard areas shall include areas containing soils that may experience significant erosion, including: i. Soil areas identified by the Natural Resources Conservation Service as having "severe" or "very severe" erosion hazard. ii. Slopes forty percent (40%) or steeper with a vertical relief of ten (10) or more feet, except areas composed of consolidated rock. iii. 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. iv. Channel migration zones, which are defined as the areas along a river or stream within which the channel(s) can be reasonably predicted to migrate over time as a result of natural and normally occurring hydrological and related processes when considered with the characteristics of the river and its surroundings. c. Alluvial fan hazard areas. Alluvial fan hazard areas shall include those areas on alluvial fans where debris flows, debris floods, or clear water floods have the potential to significantly damage or harm the health or welfare of the community. They include the area generally corresponding to the path of potential flooding, channel changes, sediment and debris deposition, or debris flow paths as determined by analysis of watershed hydrology and slope conditions, topography, valley bottom and channel conditions, potential for channel changes, and surface and subsurface geology. i. If the approval authority determines that a proposed use along a Type S or F stream is within a historic channel migration zone, based on field conditions, historic information, LIDAR imagery or aerial photography, and the one-hundred-year channel migration hazard area has not been mapped, the approval authority shall require the applicant to determine if a one-hundred-year channel migration hazard area is present on the site and, if so, delineate its location and extent. ii. The determination as to whether the one-hundred-year channel migration hazard area affects the subject property shall be based on the findings of a qualified professional proficient in fluvial geomorphology using a reliable methodology to determine channel migration accepted by the department (e.g., as described in the Washington Department of Natural Resources' Forest Practices Board Manual, Standard Methods for identifying Channel Migration Zones and Bankfull Channel Features, dated 8/2001, as amended; or in