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1. Development proposals shall provide compensatory storage if grading, fill, or other activity will <br />reduce the effective base flood storage volume of the floodplain. Compensatory storage shall <br />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 displacement <br />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 be <br />designed, graded and maintained to prevent fish stranding; and <br />e. The Administrator may approve equivalent compensatory storage off the site if acceptable <br />legal arrangements are made to assure that the effective compensatory storage volume will <br />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. Plans <br />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; <br />e. Relationship of the proposed use to the comprehensive plan and floodplain management <br />program for that area; <br />f. Safety of access to the property in times of flood for ordinary and emergency vehicles; <br />g. Expected heights, velocity, duration, rate of rise, and sediment transport of the flood waters <br />and the effects of wave action at the site; <br />h. Costs of providing governmental services during and after flood conditions, including <br />maintenance and repair of public utilities and facilities; <br />i. Location and extent of storage area for floodwater which will be displaced by the proposed <br />development; and <br />j. The risk to public and private property and public health, safety and welfare due to rising of <br />water levels, shifting of stream channels (including related erosion) as well as costs to <br />individuals and the general public for items which are not insured such as loss of <br />productivity due to closed roads, risk to emergency response workers, loss of uninsured <br />property (cars, landscaping, etc.) and habitat damage as a result of loss of riparian zones <br />and floodplain function. <br />(Ord. 2016-006, 2016) <br /> <br />17B.05.020U Critical aquifer recharge areas – designation, mapping, and classification. <br />1. Designation: Critical aquifer recharge areas are areas where an aquifer that is a source of <br />drinking water is vulnerable to contamination that would affect the potability of the water. <br />These recharge areas have geologic conditions that allow high infiltration rates, which