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<br />Kittitas County Board of County Commissioners Shoreline Master Program Adopting Ordinance <br />Kittitas County Shoreline Master Program Exhibit D | March 2016 | Page 277 of 339 <br /> <br />State Department of Ecology, or other qualified source. Where base flood elevation data <br />and floodway delineation are not available either through the report or from a qualified <br />source, historical data, high water marks, and photographs of past flooding shall be used to <br />determine base flood elevations. <br />2. Additional areas may be classified by the Administrator as frequently flooded areas, based <br />upon the following criteria: <br />a. Documented history of flood damage; and/or <br />b. Evidence of stream channel instability and susceptibility to erosion. <br /> <br />17B.05.020R Frequently flooded areas – protection standards. <br />1. New uses and developments within frequently flooded areas, including flood control <br />structures regulated in KCC 17B.05.030, shall comply with the Kittitas County Flood <br />Prevention Ordinance (KCC Chapter 14.08 – December 2014) which is hereby adopted by <br />reference. <br />2. Floodplain storage: New uses or developments shall not reduce the effective flood storage <br />volume within a frequently flooded area. If proposed grading, fill, or other activity would <br />reduce effective flood storage volume, then mitigation is required per KCC 17B.05.020T. <br />below. <br /> <br />17B.05.020S Frequently flooded areas – reporting. <br />1. The Administrator’s approval of a new use or development within a frequently flooded area <br />shall be contingent upon reporting that meets the requirements of KCC 14.08.110 through <br />14.08.130 (December 2014). <br /> <br />17B.05.020T Frequently flooded areas – compensatory mitigation. <br />1. Development proposals shall provide compensatory storage if grading, fill, or other activity <br />will reduce the effective base flood storage volume of the floodplain. Compensatory storage <br />shall comply with KCC 14.08.315 (December 2014) and the following: <br />a. Provide equivalent volume at equivalent elevations to that being displaced. For this <br />purpose, “equivalent elevation” means having similar relationship to ordinary high water <br />and to the best available ten-(10)-year, fifty-(50)-year, and one hundred-(100)-year water <br />surface profiles; <br />b. Be hydrologically connected to the source of flooding; <br />c. Provide compensatory storage in the same construction season as when the <br />displacement of flood storage volume occurs and before the flood season begins; <br />d. If the newly created storage area is accessible to fish during flood events, the area shall <br />be designed, graded and maintained to prevent fish stranding; and <br />e. The Administrator may approve equivalent compensatory storage off the site if <br />acceptable legal arrangements are made to assure that the effective compensatory <br />storage volume will be preserved over time. <br />2. Mitigation plans for development within frequently flooded areas that will reduce the effective <br />base flood storage volume of the floodplain shall be prepared by an engineer licensed in the <br />state of Washington and familiar with hydrology, hydraulics, and fluvial geomorphology. <br />Plans shall include the following information: <br />a. Potential that materials may be swept during flooding onto other lands to the detriment of <br />others; <br />b. Actual danger to life and property if flooding or erosion occurs; <br />c. Susceptibility of the proposed development and its contents to flood damage; <br />d. Availability of alternative locations for the proposed use which are not subject to flood or <br />erosion damage;