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Kittitas County,WA <br /> § 17A.05.040 KITTITAS COUNTY CODE § 17A.05.050 <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 /> § 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 <br /> Downloaded from https:Hecode360.com/KI6857 on 2025-05-15 <br />