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the Department of Natural Resources' Area Hydrologist is notified at least ten days prior to issuance of any permit, and that the standards in § 1103.05(4)(a), 1103.05(4)(c)1, and 1103.05(4)(f) of this chapter are met. (2) Standards for Floodway Permitted Uses. (a) The use must have a low flood damage potential. (b) With the exception of the uses listed in 1103.05(1)(e), the use must not obstruct flood flows or increase flood elevations and must not involve structures, fill, obstructions, excavations or storage of materials or equipment. (c) Any facility that will be used by employees or the general public must be designed with a flood warning system that provides adequate time for evacuation if the area is inundated to a depth and velocity such that the depth (in feet) multiplied by the velocity (in feet per second) would exceed a product of four upon occurrence of the regional (1 %-chance) flood. (3) Conditional uses. The following uses may be allowed as conditional uses following the standards and procedures set forth in § 1103.11(4) of this chapter and further subject to the standards set forth in § 1103.05(4), if otherwise allowed in the underlying zoning district or any applicable overlay district. (a) Structures accessory to the uses listed in § 1103.05(1) and the uses listed below. (b) Extraction and storage of sand, gravel and other materials. (c) Marinas, boat rentals, permaent docks, piers, wharves and water control structures, (d) Storage yards for equipment, machinery or materials. (e) Placement of fill or construction of fences that obstruct flood flows. Farm fences, as defined in § 1103.03, are permitted uses. (0 Travel -ready recreational vehicles meeting the exemption standards in § 1103.10(3). (g) Levees or dikes intended to protect agricultural crops for a frequency flood event equal to or less than the 10 -year frequency flood event. (4) Standards for Floodway Conditional Uses. (a) All uses. A conditional use must not cause any increase in the stage of the 1% chance or regional flood or cause an increase in flood damages in the reach or reaches affected. (b) Fill; Storage of Materials and Equipment: 1. The storage or processing of materials that are, in time of flooding, flammable, explosive or potentially injurious to human, animal or plant life is prohibited. 9 of 25