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Kittitas County, WA <br />§ 17A.05.040 KITTITAS COUNTY CODE § 17A.05.050 <br />Downloaded from https://ecode360.com/KI6857 on 2025-05-15 <br /> <br /> <br /> <br />3. The proposed drainage system including, but not limited to, storm sewers, overland flow paths, <br />detention facilities, and roads; <br />4. Existing and proposed structures, fill, pavement, and other impervious surfaces, and locations for <br />storage of hazardous materials; <br />5. Existing native vegetation and proposed clearing limits; and <br />6. If the proposed development involves grading, excavation, or filling, include proposed post- <br />development terrain at one (1) foot contour intervals. <br />(Ord. 2021-016, 2021) <br /> <br />§ 17A.05.050. Compensatory mitigation requirements. <br />1. Floodplain storage. If development occurs within a frequently flooded area, the volume of space <br />occupied by the authorized fill or structure below the base flood elevation shall be compensated for <br />and balanced by a hydraulically equivalent volume of excavation taken from below the base flood <br />elevation. Compensatory storage shall comply with KCC § 14.08.315 and the following: <br />a. Provide equivalent volume at equivalent elevations to that being displaced. For this purpose, <br />"equivalent elevation" means having similar relationship to ordinary high water and to the best <br />available ten (10)-year, fifty (50)-year, and one hundred (100)-year water surface profiles; <br />b. Provide flood storage that is hydrologically connected to the source of flooding; <br />c. Provide flood storage in an area that is vegetated; <br />d. Consider the existing and future ecological hydrologic functions of the impact and mitigation <br />sites; <br />e. Result in no net rise of flood elevations (when the mitigation will occur at a distance from the <br />fill location); <br />f. Areas below the waterline of a pond or other body of water cannot be credited as compensatory <br />storage; <br />g. Provide flood storage in the same construction season as when the displacement of flood storage <br />volume occurs and before the flood season begins; and <br />h. If the newly created storage area is accessible to fish during flood events, the area shall be <br />designed, graded, and maintained to prevent fish stranding. <br />2. Floodplain storage site selection. The order of preference for selecting floodplain storage sites shall <br />be: <br />a. Onsite flood storage; <br />b. Off-site flood storage in close proximity upstream or downstream of the floodplain fill location; <br />and <br />c. Off-site flood storage in a location further upstream or downstream of the floodplain fill location. <br />3. Floodplain storage mitigation plans. When required by KCC § 17A.05.050.2, floodplain storage <br />mitigation plans shall be prepared by an engineer or geologist licensed in the state of Washington and